阅读说明：本技术 一种酸性矿山废水的被动式生物处理系统 (Passive biological treatment system for acid mine wastewater ) 是由 刘欣 严松 李永腾 吴淑娟 于 2021-08-12 设计创作，主要内容包括：本发明属于废水处理技术领域,公开了一种酸性矿山废水的被动式生物处理系统,所述酸性矿山废水的被动式生物处理系统包括生物处理模块、滤网过滤模块、滤网更换机构和驱动机构；所述滤网过滤模块设置在生物处理模块的入水端,所述滤网更换机构与滤网过滤模块连接,所述驱动机构设在滤网更换机构的右侧且与其相互连通；所述生物处理模块包括处理槽,所述处理槽内开设有曝气池、沉淀池和中和反应池。本发明通过生物处理模块、滤网过滤模块对酸性矿山废水进行被动式修复,通过生物处理模块中的中和反应池对酸性矿山废水进行中和处理,利用石灰石、氢氧化镁和有机质混合材料作为天然的中和剂来中和酸性矿山废水的酸度,合理利用了资源,经济环保。(The invention belongs to the technical field of wastewater treatment, and discloses a passive biological treatment system for acid mine wastewater, which comprises a biological treatment module, a filter screen filtering module, a filter screen replacing mechanism and a driving mechanism; the filter screen filtering module is arranged at the water inlet end of the biological treatment module, the filter screen replacing mechanism is connected with the filter screen filtering module, and the driving mechanism is arranged on the right side of the filter screen replacing mechanism and is communicated with the filter screen replacing mechanism; the biological treatment module comprises a treatment tank, and an aeration tank, a sedimentation tank and a neutralization reaction tank are arranged in the treatment tank. According to the invention, the acid mine wastewater is passively repaired through the biological treatment module and the filter screen filtering module, the acid mine wastewater is neutralized through the neutralization reaction tank in the biological treatment module, and the acidity of the acid mine wastewater is neutralized by using limestone, magnesium hydroxide and an organic matter mixed material as a natural neutralizer, so that resources are reasonably utilized, and the method is economic and environment-friendly.)

1. A passive biological treatment system for acid mine wastewater is characterized by comprising a biological treatment module, a filter screen filtering module, a filter screen replacing mechanism and a driving mechanism;

the filter screen filtering module is arranged at the water inlet end of the biological treatment module, the filter screen replacing mechanism is connected with the filter screen filtering module, and the driving mechanism is arranged on the right side of the filter screen replacing mechanism and is communicated with the filter screen replacing mechanism;

the biological treatment module comprises a treatment tank, wherein an aeration tank, a sedimentation tank and a neutralization reaction tank are arranged in the treatment tank, the aeration tank, the sedimentation tank and the neutralization reaction tank are separated by a partition plate, and a gap is formed at the upper end of the partition plate;

the bottom of the aeration tank is paved with a spiral aeration pipe, the aeration pipe is communicated with external oxygen supply equipment through a connecting pipeline, the oxygen supply equipment is connected with a control module, the control module is used for calculating aeration flow and controlling aeration quantity, and the bottom of the neutralization reaction tank is paved with an alkaline material layer;

the calculation method for calculating the aeration flow by the control module comprises the following steps:

setting an objective function including aeration quantity and dissolved oxygen fluctuation quantity, and solving a simulation mathematical model and a dual equation thereof; wherein the objective function is set to:

wherein T is the total time, S_OIn order to obtain the concentration of dissolved oxygen,(ii) a desired value for DO concentration;

dispersing the control variable in a piecewise constant mode, namely dividing intervals at equal intervals according to the running time, and taking the value of the control variable to be constant in each interval;

calculating a first derivative value of the target function relative to the control variable, and calculating a control variable value by adopting a confidence interval method;

the filter screen replacing mechanism comprises a filter shell, a fixed plate is arranged in the filter shell, the left side of the fixed plate is fixedly inserted into the three filter screen bodies through three first inserting blocks, an inserting rod is arranged at the top of the fixed plate and is mutually inserted into the three first inserting blocks, and the right side of the fixed plate is fixedly connected with two connecting columns;

actuating mechanism is including connecting the shell, connecting shell fixed connection just communicates each other on the right side of crossing the filter shell rather than, two installation shells of right side fixedly connected with of connecting the shell, the right side fixedly connected with telescopic link of installation shell inner wall.

2. The system for the passive biological treatment of acid mine wastewater according to claim 1, wherein a pH adjusting device, a plant filter slope and a microorganism pool are further arranged in the treatment tank;

wherein the pH adjusting device contains thiobacillus ferrooxidans and humic acid and is used for leading the bacterium density of the thiobacillus ferrooxidans in the acid mine wastewater to be 1 x 10⁴cells/mL～7×10⁶cell/mL, wherein the concentration of the humic acid is 60-750 mg/L, and the pH value of the acid mine wastewater is adjusted to 1.5-4.5;

the slope of the plant filtering slope is 15-20 degrees, the plant types of the plant filtering slope comprise water spinach, mountain bitter grass and ryegrass, and the water spinach seeds, the mountain bitter grass seeds and the ryegrass seeds are mixed according to the mass ratio of 3: 1: 2, mixed planting is carried out;

the filler in the microbial pool is pond sludge with the water content of 40-55%, waste mushroom sticks and humic acid according to the mass ratio of 7: 2: 3, and mixing.

3. The system for passively biologically treating acid mine wastewater according to claim 1, wherein the alkaline material layer is a mixture of limestone, magnesium hydroxide and organic matter, and the mass ratio of the limestone, the magnesium hydroxide and the organic matter is 1: 1.5-2.5: 0.3-0.6, and the thickness of the alkaline material layer is 150-260 cm.

4. The system for the passive biological treatment of acid mine wastewater according to claim 1, wherein the control module controls the aeration rate by a control method comprising:

setting an expected dissolved oxygen concentration, and calculating an oxygen consumption absorption rate according to the actual dissolved oxygen concentration;

calculating an oxygen transfer rate according to the aeration parameters, and determining an increase/decrease amount of aeration amount capable of bringing the actual dissolved oxygen concentration to the desired dissolved oxygen concentration according to a difference between the actual dissolved oxygen concentration and the desired dissolved oxygen concentration, an oxygen consumption absorption rate, and the oxygen transfer rate;

wherein, the calculation formula of the oxygen transfer rate is as follows:

wherein, OTR_fIs oxygen transfer rate, alpha is a correction coefficient based on water quality and a tank type structure, F is an aerator pollution coefficient, SOTR is a new aerator standard oxygen transfer rate, theta is a temperature correction coefficient, T is an aeration tank water body actual temperature,in order to achieve a steady state saturated dissolved oxygen concentration,the saturated dissolved oxygen concentration of the aeration tank under the preset condition is shown, and C is the average dissolved oxygen concentration of the aeration tank;

determining aeration control parameters according to the aeration increase/decrease amount, and adjusting the aeration according to the aeration control parameters;

wherein, the formula for adjusting the aeration amount is as follows:

wherein, AOTR_actFor second oxygen transfer rate, OTR_NThe first oxygen transfer rate was determined at an average dissolved oxygen concentration of Nmg/L,saturated dissolved oxygen concentration at steady state, C_aIs the actual dissolved oxygen concentration.

5. The system for passive biological treatment of acid mine wastewater according to claim 4, wherein the aeration parameters include aerator pollution factor, new aerator standard oxygen transfer rate, correction factor based on water quality and tank type structure, temperature correction factor, actual temperature of aeration tank water, steady state saturated dissolved oxygen concentration, saturated dissolved oxygen concentration of aeration tank under predetermined conditions, and aeration tank average dissolved oxygen concentration.

6. The system for passively biologically treating acid mine wastewater according to claim 1, wherein the left ends of the telescopic rods sequentially penetrate through the mounting shell and the connecting shell from right to left and extend to the inside of the connecting shell, the left ends of the two telescopic rods are fixedly connected through a barrier plate, the left side of the barrier plate is in contact with the right side of the filtering shell, the left side of the barrier plate is fixedly connected with the right end of the connecting column, the top of the connecting shell is provided with a screen replacing port, the bottom of the right side of the barrier plate is fixedly connected with a connecting rod, one end of the connecting rod, far away from the barrier plate, penetrates through the connecting shell and extends to the outside of the connecting shell, the connecting shell is provided with a through groove matched with the connecting rod, the right side of the bottom of the connecting shell is fixedly connected with a driving motor, and an output shaft of the driving motor is fixedly connected with a driving rotating shaft, the left end of the driving rotating shaft penetrates through the connecting plate and extends to the outside of the connecting plate to be fixedly connected with a lead screw, and the left end of the lead screw penetrates through the moving block and extends to the outside of the moving block.

7. The system for the passive biological treatment of acid mine wastewater according to claim 1, wherein a second insert block is fixedly connected to the left side of the filter screen body, and the second insert block is inserted into the left side of the inner wall of the filter shell;

the top of the connecting shell is provided with a net replacing port, the top of the connecting shell and the right side corresponding to the net replacing port are hinged with a cover plate through a hinge, and the cover plate is clamped with the top of the connecting shell through a clamping block;

the top of the connecting shell is fixedly connected with a first handle at the top end of the inserted bar, and the top of the cover plate is fixedly connected with a second handle.

8. The system for the passive biological treatment of acid mine wastewater according to claim 1, wherein a stabilizing shell is fixedly connected to the right side of the connecting plate and corresponds to the position of the driving motor, and heat dissipation holes are formed in the surface of the stabilizing shell;

the surface of the screw rod is provided with external threads, and the position of the moving block, which corresponds to the screw rod, is provided with internal threads matched with the external threads.

9. A computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface for applying the passive biological treatment system of acidic mine wastewater of any of claims 1-8 when executed on an electronic device.

10. A computer readable storage medium storing instructions which, when executed on a computer, cause the computer to apply the passive biological treatment system for acidic mine wastewater of any one of claims 1 to 8.

Technical Field

The invention belongs to the technical field of wastewater treatment, and particularly relates to a passive biological treatment system for acid mine wastewater.

Background

At present, Acid mine wastewater (AMD) is generated by oxidizing sulfur-containing ore in tailings, has the characteristics of high concentration of heavy metal ions, low pH value and the like, and is a type of mine wastewater with the greatest environmental hazard. In the process of mining and stacking waste ores of coal mines or various non-ferrous metal ores, pyrite associated with ore beds is usually exposed to air and underground water or surface water, and the near-neutral underground water is converted into low-pH high-Fe and SO through a series of chemical and biological oxidation processes₄ ^2-And various heavy (like) metal ions (Cd, Pb, Cu, Zn, As and the like) coexist. The acidic mine wastewater has the characteristics of complex pollution components, large water quantity fluctuation, dispersed discharge points, difficult control and the like, and if the wastewater is discharged randomly without effective treatment, the wastewater seriously pollutes surface water and land resources and threatens crops, aquatic organisms and human health.

The common biological treatment method for treating acid mine wastewater is a wastewater treatment method which converts organic pollutants in a solution, colloid and fine suspension state in wastewater into stable and harmless substances through the metabolism of microorganisms, and in the wastewater treatment process, the wastewater is often filtered by using a filter screen, most of the passive biological treatment systems for acid wastewater in the prior art are inconvenient to replace the filter screen, and a user needs to spend a certain time and effort for operation, so that the wastewater treatment efficiency is reduced, and the requirements are difficult to meet.

Through the above analysis, the problems and defects of the prior art are as follows: most of the passive biological treatment systems for acidic wastewater in the prior art are inconvenient for replacing the filter screen, and a user needs to spend a certain time and strength for operation, so that the efficiency of wastewater treatment is reduced, and the requirements are difficult to meet.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a passive biological treatment system for acid mine wastewater.

The invention is realized in such a way that the passive biological treatment system for the acid mine wastewater comprises a biological treatment module, a filter screen filtering module, a filter screen replacing mechanism and a driving mechanism.

The filter screen filtering module is arranged at the water inlet end of the biological treatment module, the filter screen replacing mechanism is connected with the filter screen filtering module, and the driving mechanism is arranged on the right side of the filter screen replacing mechanism and is communicated with the filter screen replacing mechanism;

the biological treatment module comprises a treatment tank, wherein an aeration tank, a sedimentation tank and a neutralization reaction tank are arranged in the treatment tank, the aeration tank, the sedimentation tank and the neutralization reaction tank are separated by a partition plate, and a gap is formed at the upper end of the partition plate;

the bottom of the aeration tank is paved with a spiral aeration pipe, the aeration pipe is communicated with external oxygen supply equipment through a connecting pipeline, the oxygen supply equipment is connected with a control module, the control module is used for calculating aeration flow and controlling aeration quantity, and the bottom of the neutralization reaction tank is paved with an alkaline material layer;

the calculation method for calculating the aeration flow by the control module comprises the following steps:

setting an objective function including aeration quantity and dissolved oxygen fluctuation quantity, and solving a simulation mathematical model and a dual equation thereof; wherein the objective function is set to:

wherein T is the total time, S_OIn order to obtain the concentration of dissolved oxygen,(ii) a desired value for DO concentration;

dispersing the control variable in a piecewise constant mode, namely dividing intervals at equal intervals according to the running time, and taking the value of the control variable to be constant in each interval;

calculating a first derivative value of the target function relative to the control variable, and calculating a control variable value by adopting a confidence interval method;

the filter screen replacing mechanism comprises a filter shell, a fixed plate is arranged in the filter shell, the left side of the fixed plate is fixedly inserted into the three filter screen bodies through three first inserting blocks, an inserting rod is arranged at the top of the fixed plate and is mutually inserted into the three first inserting blocks, and the right side of the fixed plate is fixedly connected with two connecting columns;

actuating mechanism is including connecting the shell, connecting shell fixed connection just communicates each other on the right side of crossing the filter shell rather than, two installation shells of right side fixedly connected with of connecting the shell, the right side fixedly connected with telescopic link of installation shell inner wall.

Further, a pH adjusting device, a plant filter slope and a microorganism pool are also arranged in the treatment tank;

wherein the pH adjusting device contains thiobacillus ferrooxidans and humic acid and is used for leading the bacterium density of the thiobacillus ferrooxidans in the acid mine wastewater to be 1 x 10⁴cells/mL～7×10⁶cell/mL, wherein the concentration of the humic acid is 60-750 mg/L, and the pH value of the acid mine wastewater is adjusted to 1.5-4.5;

the slope of the plant filtering slope is 15-20 degrees, the plant types of the plant filtering slope comprise water spinach, mountain bitter grass and ryegrass, and the water spinach seeds, the mountain bitter grass seeds and the ryegrass seeds are mixed according to the mass ratio of 3: 1: 2, mixed planting is carried out;

the filler in the microbial pool is pond sludge with the water content of 40-55%, waste mushroom sticks and humic acid according to the mass ratio of 7: 2: 3, and mixing.

Further, the alkaline material layer is a mixed material of limestone, magnesium hydroxide and organic matters, and the mass ratio of the limestone to the magnesium hydroxide to the organic matters is 1: 1.5-2.5: 0.3-0.6, and the thickness of the alkaline material layer is 150-260 cm.

Further, the control module adopts a control method for controlling the aeration amount, which comprises the following steps:

setting an expected dissolved oxygen concentration, and calculating an oxygen consumption absorption rate according to the actual dissolved oxygen concentration;

calculating an oxygen transfer rate according to the aeration parameters, and determining an increase/decrease amount of aeration amount capable of bringing the actual dissolved oxygen concentration to the desired dissolved oxygen concentration according to a difference between the actual dissolved oxygen concentration and the desired dissolved oxygen concentration, an oxygen consumption absorption rate, and the oxygen transfer rate;

wherein, the calculation formula of the oxygen transfer rate is as follows:

wherein, OTR_fIs oxygen transfer rate, alpha is a correction coefficient based on water quality and a tank type structure, F is an aerator pollution coefficient, SOTR is a new aerator standard oxygen transfer rate, theta is a temperature correction coefficient, T is an aeration tank water body actual temperature,in order to achieve a steady state saturated dissolved oxygen concentration,the saturated dissolved oxygen concentration of the aeration tank under the preset condition is shown, and C is the average dissolved oxygen concentration of the aeration tank;

determining aeration control parameters according to the aeration increase/decrease amount, and adjusting the aeration according to the aeration control parameters;

wherein, the formula for adjusting the aeration amount is as follows:

wherein, AOTR_actFor second oxygen transfer rate, OTR_NThe first oxygen transfer rate was determined at an average dissolved oxygen concentration of Nmg/L,is saturated and dissolved in a steady stateConcentration of dissolved oxygen, C_aIs the actual dissolved oxygen concentration.

Further, the aeration parameters comprise an aerator pollution coefficient, a new aerator standard oxygen transfer rate, a correction coefficient based on water quality and a tank type structure, a temperature correction coefficient, the actual temperature of the water body of the aeration tank, a steady saturated dissolved oxygen concentration, a saturated dissolved oxygen concentration of the aeration tank under a preset condition and an average dissolved oxygen concentration of the aeration tank.

Furthermore, the left ends of the telescopic rods sequentially penetrate through the mounting shell and the connecting shell from right to left and extend to the inside of the connecting shell, the left ends of the two telescopic rods are fixedly connected through a barrier plate, the left side of the barrier plate is contacted with the right side of the filter shell, the left side of the barrier plate is fixedly connected with the right end of the connecting column, the top of the connecting shell is provided with a net changing port, the bottom of the right side of the barrier plate is fixedly connected with a connecting rod, one end of the connecting rod, far away from the barrier plate, penetrates through the connecting shell and extends to the outside of the connecting shell to be fixedly connected with a moving block, the connecting shell is provided with a through groove matched with the connecting rod in position, the right side of the bottom of the connecting shell is fixedly connected with the connecting shell, the right side of the connecting plate is fixedly provided with a driving motor, an output shaft of the driving motor is fixedly connected with a driving rotating shaft, and the left end of the driving rotating shaft penetrates through the connecting plate and extends to the outside of the connecting plate to be fixedly connected with a lead screw, the left end of the lead screw penetrates through the moving block and extends to the outside of the moving block.

Furthermore, a second inserting block is fixedly connected to the left side of the filter screen body and is inserted into the left side of the inner wall of the filter shell;

the top of the connecting shell is provided with a net replacing port, the top of the connecting shell and the right side corresponding to the net replacing port are hinged with a cover plate through a hinge, and the cover plate is clamped with the top of the connecting shell through a clamping block;

the top of the connecting shell is fixedly connected with a first handle at the top end of the inserted bar, and the top of the cover plate is fixedly connected with a second handle.

Further, a stabilizing shell is fixedly connected to the right side of the connecting plate and corresponds to the position of the driving motor, and heat dissipation holes are formed in the surface of the stabilizing shell;

the surface of the screw rod is provided with external threads, and the position of the moving block, which corresponds to the screw rod, is provided with internal threads matched with the external threads.

It is another object of the present invention to provide a computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface to apply the passive biological treatment system for acidic mine wastewater when executed on an electronic device.

It is another object of the present invention to provide a computer readable storage medium storing instructions that, when executed on a computer, cause the computer to apply the passive biological treatment system for acidic mine wastewater.

By combining all the technical schemes, the invention has the advantages and positive effects that: according to the passive biological treatment system for the acid mine wastewater, the acid mine wastewater can be passively repaired through the biological treatment module and the filter screen filtering module, the acid mine wastewater can be neutralized through the neutralization reaction tank in the biological treatment module, the acidity of the acid mine wastewater is neutralized by using limestone, magnesium hydroxide and an organic matter mixed material as a natural neutralizing agent, resources are reasonably utilized, and the system is economical and environment-friendly. The invention realizes the on-line control of the aeration flow, can accurately control the aeration flow, and achieves the purposes of reducing the power consumption and saving the operation cost. Meanwhile, the passive biological treatment system for acid mine wastewater provided by the invention is reasonable in structural design, can be used for quickly and conveniently replacing the filter screen, is convenient to use, is time-saving and labor-saving in operation, improves the wastewater treatment efficiency, and can meet the multi-directional use requirement.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a biological treatment module according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the connection between the filter screen replacing mechanism and the driving mechanism according to the embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a filter screen replacing mechanism according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a driving mechanism according to an embodiment of the present invention.

Fig. 5 is a flowchart of a calculation method for calculating an aeration flow rate by a control module according to an embodiment of the present invention.

Fig. 6 is a flowchart of a control method for controlling aeration amount by the control module according to the embodiment of the present invention.

In the figure: 1. a biological treatment module; 2. a filter screen filtering module; 3. a filter screen replacing mechanism; 4. a drive mechanism; 5. an aeration tank; 6. a sedimentation tank; 7. a neutralization reaction tank; 8. a separator plate; 9. a notch; 10. a filter screen body; 11. a filter shell; 12. a fixing plate; 13. a first insert block; 14. connecting columns; 15. mounting a shell; 16. a telescopic rod; 17. the connecting shell.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Aiming at the problems in the prior art, the invention provides a passive biological treatment system for acid mine wastewater, and the invention is described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the passive biological treatment system for acidic mine wastewater in the embodiment of the present invention includes a biological treatment module 1, a screen filter module 2, a screen replacement mechanism 3, and a driving mechanism 4.

The filter screen filtering module is arranged at the water inlet end of the biological treatment module, the filter screen replacing mechanism is connected with the filter screen filtering module, and the driving mechanism is arranged on the right side of the filter screen replacing mechanism and is communicated with the filter screen replacing mechanism;

the biological treatment module comprises a treatment tank, wherein an aeration tank 5, a sedimentation tank 6 and a neutralization reaction tank 7 are arranged in the treatment tank, the aeration tank 5, the sedimentation tank 6 and the neutralization reaction tank 7 are separated by a partition plate 8, and a gap 9 is formed at the upper end of the partition plate 8;

a spiral aeration pipe is laid at the bottom of the aeration tank 5, the aeration pipe is communicated with external oxygen supply equipment through a connecting pipeline, the oxygen supply equipment is connected with a control module, the control module is used for calculating aeration flow and controlling aeration quantity, and an alkaline material layer is laid at the bottom of the neutralization reaction tank;

the filter screen filtering module 2 comprises three filter screen bodies 10, the filter screen replacing mechanism 3 comprises a filtering shell 11, a fixing plate 12 is arranged inside the filtering shell, the three filter screen bodies 10 are fixedly inserted into the left side of the fixing plate 12 through three first inserting blocks 13, an inserting rod is arranged at the top of the fixing plate 12, the inserting rod and the three first inserting blocks 13 are inserted into each other, and two connecting columns 14 are fixedly connected to the right side of the fixing plate;

actuating mechanism 4 is including connecting shell 17, connecting shell 17 fixed connection and just communicate each other on the right side of crossing the filter shell rather than, connecting two installation shells 15 of the right side fixedly connected with of shell 17, the right side fixedly connected with telescopic link 16 of installation shell 15 inner wall.

The treatment tank in the embodiment of the invention is also internally provided with a pH adjusting device, a plant filter slope and a microorganism pool;

wherein the pH adjusting device contains thiobacillus ferrooxidans and humic acid and is used for leading the bacterium density of the thiobacillus ferrooxidans in the acid mine wastewater to be 1 x 10⁴cells/mL～7×10⁶cell/mL, wherein the concentration of the humic acid is 60-750 mg/L, and the pH value of the acid mine wastewater is adjusted to 1.5-4.5;

the slope of the plant filtering slope is 15-20 degrees, the plant types of the plant filtering slope comprise water spinach, mountain bitter grass and ryegrass, and the water spinach seeds, the mountain bitter grass seeds and the ryegrass seeds are mixed according to the mass ratio of 3: 1: 2, mixed planting is carried out;

the filler in the microbial pool is pond sludge with the water content of 40-55%, waste mushroom sticks and humic acid according to the mass ratio of 7: 2: 3, and mixing.

The alkaline material layer in the embodiment of the invention is a mixed material of limestone, magnesium hydroxide and organic matters, the thickness is 150-260 cm, and the mass ratio of the limestone to the magnesium hydroxide to the organic matters is 1: 1.5-2.5: 0.3 to 0.6.

The left ends of the telescopic rods in the embodiment of the invention sequentially penetrate through the mounting shell and the connecting shell from right to left and extend to the inside of the connecting shell, the left ends of the two telescopic rods are fixedly connected through the barrier plate, the left side of the barrier plate is mutually contacted with the right side of the filter shell, the left side of the barrier plate is fixedly connected with the right end of the connecting column, the top of the connecting shell is provided with a net changing port, the bottom of the right side of the barrier plate is fixedly connected with a connecting rod, one end of the connecting rod, far away from the barrier plate, penetrates through the connecting shell and extends to the outside of the connecting shell to be fixedly connected with a moving block, the connecting shell is provided with a through groove matched with the connecting rod, the right side of the bottom of the connecting shell is fixedly connected with a driving motor, the right side of the connecting plate is fixedly provided with a driving rotating shaft, the left end of the driving rotating shaft penetrates through the connecting plate and extends to the outside of the connecting plate to be fixedly connected with a screw rod, the left end of the screw rod penetrates through the moving block and extends to the outside of the moving block.

The left side of the filter screen body in the embodiment of the invention is fixedly connected with a second insertion block, and the second insertion block is inserted into the left side of the inner wall of the filter shell.

The top of the connecting shell in the embodiment of the invention is provided with a net replacing port, the top of the connecting shell and the right side corresponding to the net replacing port are hinged with a cover plate through a hinge, and the cover plate is clamped with the top of the connecting shell through a clamping block;

the top end of the connecting shell top inserted bar is fixedly connected with a first handle, and the top of the cover plate is fixedly connected with a second handle.

In the embodiment of the invention, a stabilizing shell is fixedly connected to the right side of the connecting plate and corresponds to the position of the driving motor, and heat dissipation holes are formed in the surface of the stabilizing shell.

In the embodiment of the invention, the surface of the screw rod is provided with an external thread, and the position of the moving block corresponding to the screw rod is provided with an internal thread matched with the external thread.

The step of changing the filter screen of this system does: through starting driving motor, it is rotatory that the drive pivot drives the lead screw, and under the connection of telescopic link, threaded connection moves movable block drive barrier plate and filter screen body on it and removes left, makes it all move to in connecting the shell, opens the apron on it, takes off the back with the inserted bar, changes three filter screen body in proper order, makes the drive pivot carry out antiport again, makes the filter screen body playback can.

As shown in fig. 5, a method for calculating an aeration flow rate through a control module according to an embodiment of the present invention includes:

s101, setting an objective function including aeration quantity and dissolved oxygen fluctuation quantity, and solving a simulation mathematical model and a dual equation thereof;

s102, dispersing the control variable in a piecewise constant mode, namely dividing intervals at equal intervals according to the operation time, and taking the value of the control variable to be constant in each interval;

and S103, calculating a first derivative value of the target function relative to the control variable, and calculating the control variable value by adopting a confidence interval method.

The objective function provided by the embodiment of the invention is set as follows:

wherein T is the total time, S_OIn order to obtain the concentration of dissolved oxygen,the desired value for the DO concentration.

As shown in fig. 6, a control method for controlling aeration amount by a control module according to an embodiment of the present invention includes:

s201, setting an expected dissolved oxygen concentration, and calculating an oxygen consumption absorption rate according to the actual dissolved oxygen concentration;

s202, calculating an oxygen transfer rate according to aeration parameters, and determining an increase/decrease of aeration amount capable of enabling the actual dissolved oxygen concentration to reach the expected dissolved oxygen concentration according to a difference value between the actual dissolved oxygen concentration and the expected dissolved oxygen concentration, an oxygen consumption absorption rate and the oxygen transfer rate;

s203, determining aeration control parameters according to the increase/decrease of the aeration, and adjusting the aeration according to the aeration control parameters.

The calculation formula of the oxygen transfer rate provided by the embodiment of the invention is as follows:

wherein, OTR_fIs oxygen transfer rate, alpha is a correction coefficient based on water quality and a tank type structure, F is an aerator pollution coefficient, SOTR is a new aerator standard oxygen transfer rate, theta is a temperature correction coefficient, T is an aeration tank water body actual temperature,in order to achieve a steady state saturated dissolved oxygen concentration,the saturated dissolved oxygen concentration of the aeration tank under the preset condition is shown, and C is the average dissolved oxygen concentration of the aeration tank.

The aeration parameters provided by the embodiment of the invention comprise an aerator pollution coefficient, a new aerator standard oxygen transfer rate, a correction coefficient based on water quality and a tank type structure, a temperature correction coefficient, the actual water temperature of an aeration tank, a steady saturated dissolved oxygen concentration, a saturated dissolved oxygen concentration of the aeration tank under a preset condition and an average dissolved oxygen concentration of the aeration tank.

The aeration amount adjusting formula provided by the embodiment of the invention is as follows:

wherein, AOTR_actFor second oxygen transfer rate, OTR_NThe first oxygen transfer rate was determined at an average dissolved oxygen concentration of Nmg/L,saturated dissolved oxygen concentration at steady state, C_aIs the actual dissolved oxygen concentration.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When used in whole or in part, can be implemented in a computer program product that includes one or more computer instructions. When loaded or executed on a computer, cause the flow or functions according to embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.)). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.