阅读说明：本技术 一种溶解性脂肪酸废水预处理装置及处理工艺 (Dissolved fatty acid wastewater pretreatment device and treatment process ) 是由 李松华 黄海滨 于 2021-08-18 设计创作，主要内容包括：本发明公开了一种溶解性脂肪酸废水预处理装置,主要包括依次连接的脂肪酸废水隔油池、絮凝螯合反应器、气浮池、缓冲池和厌氧反应塔,所述气浮池上部设有将其分隔成内池和外池的分隔墙,所述分隔墙上设有连通内池和外池的滤水口,气浮池一侧通过隔水墙连接有排渣池,分隔墙朝向排渣池一侧形成收拢口直至与隔水墙连接,所述隔水墙上设有放水口,所述放水口处设有闸门,所述闸门连接有驱动装置,所述内池中设有浮球液位开关,所述浮球液位开关与驱动装置电性连接。本发明降低了后续生化处理负荷,减少生化系统的投资费用及运行成本,气浮池利用液位高度差,使悬浮类物质自动流入排渣池中,无需安装结构复杂的刮渣装置便能实现排渣的目的,简单有效。(The invention discloses a dissolved fatty acid wastewater pretreatment device which mainly comprises a fatty acid wastewater oil separation tank, a flocculation chelation reactor, an air flotation tank, a buffer tank and an anaerobic reaction tower which are sequentially connected, wherein a partition wall for partitioning the air flotation tank into an inner tank and an outer tank is arranged at the upper part of the air flotation tank, a water filtering port for communicating the inner tank and the outer tank is arranged on the partition wall, one side of the air flotation tank is connected with a slag discharging tank through the water separation wall, a furling port is formed at one side of the partition wall, which faces the slag discharging tank, until the partition wall is connected with the water separation wall, a water discharging port is arranged on the water separation wall, a gate is arranged at the water discharging port and is connected with a driving device, a floating ball liquid level switch is arranged in the inner tank, and the floating ball liquid level switch is electrically connected with the driving device. The invention reduces the load of subsequent biochemical treatment, reduces the investment cost and the operation cost of a biochemical system, leads suspended substances to automatically flow into the slag discharging tank by utilizing the height difference of the liquid level in the air flotation tank, can realize the aim of discharging slag without installing a slag scraping device with a complex structure, and is simple and effective.)

1. The utility model provides a solubility fatty acid pretreatment of water device that gives up, mainly includes fatty acid waste water oil interceptor (1), flocculation chelate reactor (2), air supporting pond (3), buffer pool (4) and anaerobic reaction tower (5) that connect gradually, its characterized in that: the upper part of the air flotation tank (3) is provided with a partition wall (6) which divides the air flotation tank into an inner tank (301) and an outer tank (302), the partition wall (6) is provided with a water filtering port (7) for communicating the inner tank (301) and the outer tank (302), one side of the air flotation tank (3) is connected with a deslagging tank (9) through the partition wall (8), the partition wall (6) gradually shrinks inwards towards one side of the deslagging tank (9) to form a closing port until being connected with the partition wall (8), the corresponding closing port of the partition wall (8) is provided with a water drainage port for communicating the inner tank (301) and the deslagging tank (9), the water drainage port is provided with a gate (10), the gate (10) is connected with a driving device, a floating ball liquid level switch (11) is arranged in the inner tank (301), the floating ball liquid level switch (11) is electrically connected with the driving device, the bottom of the inner tank (301) is provided with a first pipeline (12) connected with the flocculation chelating reactor (2), and a second pipeline (13) connected with the buffer tank (4) is arranged on the side wall of the outer tank (302).

2. The apparatus for pretreating soluble fatty acid wastewater according to claim 1, wherein: an inverted U-shaped fixing frame (14) is arranged on the water-stop wall (8), the driving device comprises a servo motor (15), an incomplete gear (16) and a driving rod (17), the lower end of the driving rod (17) is connected with the top of the gate (10), the upper end of the driving rod (17) is sleeved on the top of the fixed frame (14) in a sliding manner, a tooth rack (18) which is longitudinally arranged is arranged on the driving rod (17), the servo motor (15) is fixed on one side of the fixed frame (14), a rotating shaft (19) of the servo motor (15) is vertical to the driving rod (17) and extends to the driving rod (17), one part of the edge of the incomplete gear (16) is provided with a tooth edge (1601), the other part is a smooth arc edge (1602), the incomplete gear (16) is connected to the tail end of the rotating shaft (19), the tooth edge (1601) is meshed with the tooth rack (18) and connected, and the servo motor (15) is electrically connected with the floating ball liquid level switch (11).

3. The apparatus for pretreating soluble fatty acid wastewater according to claim 2, wherein: smooth arc limit (1602) of incomplete gear (16) is a part of the tooth root circumference that tooth limit (1601) were located, and the arc length of smooth arc limit (1602) is the quarter of tooth root circumference length, the stroke of tooth flank (18) is more than or equal to tooth limit (1601) stroke when flare-out.

4. The apparatus for pretreating soluble fatty acid wastewater according to claim 2, wherein: a boosting rod (20) perpendicular to the surface of the incomplete gear (16) is arranged at the beginning of the tooth edge (1601) on the surface of the incomplete gear, and a lifting rod (21) perpendicular to the driving rod (17) is arranged on one side of the upper end of the tooth rack (18).

5. The apparatus for pretreating soluble fatty acid wastewater according to claim 1, wherein: the inner side of the upper end of the partition wall (6) is provided with a circle of air blowing holes (22), and the part of the partition wall (6) connected with the air floatation tank (3) is of an arc structure.

6. The apparatus for pretreating soluble fatty acid wastewater according to claim 1, wherein: be located to be equipped with filter screen (23) on row's cinder basin (9) lateral wall of drain hole below, arrange cinder basin (9) bottom and be equipped with backwash pump (24), be equipped with back flow (25) and air supporting pond (3) intercommunication on backwash pump (24).

7. The apparatus for pretreating soluble fatty acid wastewater according to claim 1, wherein: flocculation chelate reactor (2) are including the chelate reation kettle (201), coagulation reaction cauldron (202) and flocculation reation kettle (203) that connect gradually, be connected with salt piggy bank (26) on chelate reation kettle (201), be connected with coagulant piggy bank (27) on coagulation reaction cauldron (202), be connected with flocculant piggy bank (28) on flocculation reation kettle (203), all be equipped with agitating unit in chelate reation kettle (201), coagulation reaction cauldron (202) and flocculation reation kettle (203), chelate reation kettle (201) lower part is equipped with pipeline three (29) and is connected with oil interceptor (1), flocculation reation kettle (203) upper portion is connected with inner tank (301) bottom through pipeline (12), buffer pool (4) are connected with anaerobic reaction tower (5) bottom through pipeline four (30).

8. The apparatus for pretreating soluble fatty acid wastewater according to claim 7, wherein: interior pond (301) bottom is connected with mud storage tank (32) through mud pipe (31), chelate reation kettle (201), coagulation reaction cauldron (202) and flocculation reaction cauldron (203) bottom are equipped with the evacuation branch pipe respectively, the evacuation branch pipe is connected respectively on a row of air main, the air main is connected to in mud storage tank (32).

9. A treatment process for treating a soluble fatty acid wastewater by using the soluble fatty acid wastewater pretreatment device according to claim 1, characterized by comprising the steps of:

1) oil removal regulation: the wastewater to be treated is pumped into an oil separation tank (1), the water quality and the water quantity are adjusted after oil separation, and the pH is controlled to be 6-9;

2) chelating and flocculating treatment: lifting the wastewater after oil removal regulation to a chelating reactor (2) for treatment, chelating the polycarbon fatty acid by calcium salt, generating colloid substances by chelation, then performing coagulation treatment by a coagulant, and generating large-particle alum floc by flocculant reinforcement;

3) air floatation treatment: the wastewater after the chelation and flocculation is subjected to air floatation treatment in an air floatation tank (3) to remove suspended substances in the wastewater;

4) anaerobic treatment: carrying out anaerobic treatment on the wastewater subjected to air floatation treatment by using a high-efficiency anaerobic reaction tower (5);

5) and treating the wastewater after the anaerobic treatment by an aerobic biochemical treatment system, and marking and discharging.

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a dissolved fatty acid wastewater pretreatment device and a treatment process.

Background

With the rapid development of the grease processing industry, the grease processing technology is also changed from the original physical method to the chemical method, and more chemical raw materials such as glycerol, fatty acid, soap particles and the like are continuously extracted from animal and vegetable grease. Along with the continuous deepening of the oil processing technology, the waste water generated by processing is also complicated, and the influence on the environment is larger because the content of organic matters in the waste water is high and the water quantity is larger. Because the prior art lacks of effective treatment on the wastewater, the wastewater is mainly treated by an anaerobic biochemical process, but enters an anaerobic system without pretreatment, and the problems of high energy consumption, high operating cost and the like are obvious.

Therefore, in the soluble fatty acid wastewater treatment process, physicochemical treatment with low cost, simple and convenient operation and strong practicability is always in a blank state; high investment cost of advanced oxidation treatment, membrane bioreactor treatment and the like, large occupied area, high treatment energy consumption, complex process and high quality of operators; the method directly enters a biochemical treatment system and has the problems of low biochemical performance, large impact load, unstable operation and the like.

Disclosure of Invention

In order to solve the problems, the invention provides a dissolved fatty acid wastewater pretreatment device and a treatment process.

The invention adopts the following technical scheme:

a dissolved fatty acid wastewater pretreatment device, which mainly comprises a fatty acid wastewater oil separation tank, a flocculation chelation reactor, an air flotation tank, a buffer tank and an anaerobic reaction tower which are connected in sequence, the upper part of the floatation tank is provided with a partition wall which divides the floatation tank into an inner tank and an outer tank, the partition wall is provided with a water filtering port which is communicated with the inner tank and the outer tank, one side of the floatation tank is connected with a slag discharging tank through a water-proof wall, the partition wall gradually shrinks inwards towards one side of the slag discharging tank to form a furling port until the partition wall is connected with the water-proof wall, a water outlet communicated with the inner tank and the slag discharge tank is arranged at the position of the water-stop wall corresponding to the closing opening, a gate is arranged at the water outlet, the gate is connected with a driving device, a floating ball liquid level switch is arranged in the inner tank and electrically connected with the driving device, a first pipeline connected with the flocculation chelation reactor is arranged at the bottom of the inner tank, and a second pipeline connected with the buffer tank is arranged on the side wall of the outer tank.

As a preferred technical scheme of the invention, an inverted U-shaped fixing frame is arranged on the diaphragm wall, the driving device comprises a servo motor, an incomplete gear and a driving rod, the lower end of the driving rod is connected to the top of the gate, the upper end of the driving rod is slidably sleeved on the top of the fixing frame, a tooth strip which is longitudinally arranged is arranged on the driving rod, the servo motor is fixed on one side of the fixing frame, a rotating shaft of the servo motor is perpendicular to the driving rod and extends to the driving rod, one part of the edge of the incomplete gear is provided with a tooth edge, the other part of the edge of the incomplete gear is a smooth arc edge, the incomplete gear is connected to the tail end of the rotating shaft, the tooth edge of the incomplete gear is meshed with the tooth strip, and the servo motor is electrically connected with the float level switch.

As a preferable technical solution of the present invention, the smooth arc edge of the incomplete gear is a part of the circumference of the tooth root where the tooth edge is located, the arc length of the smooth arc edge is one fourth of the circumference of the tooth root, and the stroke of the rack is greater than or equal to the stroke of the tooth edge when the tooth edge is straightened.

In a preferred embodiment of the present invention, a boosting rod perpendicular to the surface of the incomplete gear is disposed at the beginning of the tooth edge on the surface of the incomplete gear, and a lifting rod perpendicular to the driving rod is disposed on one side of the upper end of the tooth rack.

As a preferable technical scheme of the invention, the inner side of the upper end of the partition wall is provided with a circle of air blowing holes, and the part of the partition wall connected with the air flotation tank is of an arc structure.

As a preferred technical scheme of the invention, a filter screen is arranged on the side wall of the slag discharging pool below the water outlet, a reflux pump is arranged at the bottom of the slag discharging pool, and a reflux pipe arranged on the reflux pump is communicated with the air flotation pool.

According to a preferable technical scheme, the flocculation chelation reactor comprises a chelation reaction kettle, a coagulation reaction kettle and a flocculation reaction kettle which are sequentially connected, wherein a salt storage tank is connected to the chelation reaction kettle, a coagulant storage tank is connected to the coagulation reaction kettle, a flocculant storage tank is connected to the flocculation reaction kettle, stirring devices are arranged in the chelation reaction kettle, the coagulation reaction kettle and the flocculation reaction kettle, a pipeline III is arranged at the lower part of the chelation reaction kettle and connected with an oil separation tank, the upper part of the flocculation reaction kettle is connected with the bottom of an inner tank through a pipeline I, and a buffer tank is connected with the bottom of an anaerobic reaction tank through a pipeline IV.

As a preferred technical scheme of the invention, the bottom of the inner pool is connected with a sludge storage tank through a sludge discharge pipe, the bottoms of the chelation reaction kettle, the coagulation reaction kettle and the flocculation reaction kettle are respectively provided with an emptying branch pipe, the emptying branch pipes are respectively connected to an emptying header pipe, and the emptying header pipe is connected into the sludge storage tank.

A treatment process for treating the soluble fatty acid wastewater by using the soluble fatty acid wastewater pretreatment device is characterized by comprising the following steps of:

1) oil removal regulation: pumping the wastewater to be treated into an oil separation tank, and adjusting the water quality and the water quantity after oil separation, wherein the pH is controlled to be 6-9;

2) chelating and flocculating treatment: lifting the wastewater after oil removal regulation to a chelating reactor for treatment, chelating the polycarbon fatty acid by calcium salt to generate colloid substances, then performing coagulation treatment by a coagulant, and strengthening by a flocculating agent to generate large-particle alum floc;

3) air floatation treatment: carrying out air floatation treatment on the chelated and flocculated wastewater by using an air floatation tank to remove suspended substances in the wastewater;

4) anaerobic treatment: carrying out anaerobic treatment on the wastewater subjected to air floatation treatment by using a high-efficiency anaerobic reaction tower;

5) and treating the wastewater after the anaerobic treatment by an aerobic biochemical treatment system, and marking and discharging.

The invention has the beneficial effects that:

the invention reduces the load of subsequent biochemical treatment, reduces the investment cost and the operation cost of a biochemical system, leads suspended substances to automatically flow into the slag discharging tank by utilizing the height difference of the liquid level in the air flotation tank, can realize the aim of discharging slag without installing a slag scraping device with a complex structure, and is simple and effective.

Drawings

FIG. 1 is a top view of an air flotation tank;

FIG. 2 is a rear side view of the floatation tank;

FIG. 3 is a right side sectional view of the air flotation tank;

FIG. 4 is a schematic diagram of the movement stroke of the driving rod driven by the incomplete gear;

FIG. 5 is a flow diagram of wastewater pretreatment according to the present invention.

The symbols in the drawings illustrate that:

1: oil interceptor, 2: flocculation chelation reactor, 201: chelating reaction kettle, 202: coagulation reaction kettle, 203: flocculation reaction kettle, 3: air flotation tank, 301: inner pool, 302: outer pool, 4: buffer pool, 5: anaerobic reaction tower, 6: dividing wall, 7: water filter, 8: diaphragm wall, 9: slag discharge pool, 10: a gate, 11: float level switch, 12: the first pipeline, 13: a second pipeline, 14: mount, 15: servo motor, 16: incomplete gear, 1601: tooth flank, 1602: smooth arc edge, 17: drive rod, 18: tooth rack, 19: rotating shaft, 20: push-aid rod, 21: lifting rod, 22: blowhole, 23: filter screen, 24: reflux pump, 25: return pipe, 26: salt storage tank, 27: coagulant storage tank, 28: flocculant storage tank, 29: pipeline three, 30: pipeline four, 31: sludge discharge pipe, 32: a sludge storage tank.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, a pretreatment device for soluble fatty acid wastewater mainly comprises a fatty acid wastewater oil separation tank 1, a flocculation chelation reactor 2, an air flotation tank 3, a buffer tank 4 and an anaerobic reaction tower 5 which are connected in sequence. The upper portion of the air flotation tank 3 is provided with a partition wall 6 which divides the air flotation tank into an inner tank 301 and an outer tank 302, the partition wall 6 is provided with a water filtering opening 7 which communicates the inner tank 301 and the outer tank 302, and a filter residue net is arranged at the position of the water filtering opening 7 and used for preventing suspended substances from entering the outer tank 302 through the filter residue net, so that the waste water of the outer tank 302 does not contain the suspended substances and can be directly discharged into the buffer tank 4. One side of the floatation tank 3 is connected with a deslagging tank 9 through a water-stop wall 8, the partition wall 6 gradually shrinks inwards towards one side of the deslagging tank 9 to form a furling opening until being connected with the water-stop wall 8, a water discharge opening communicated with the inner tank 301 and the deslagging tank 9 is arranged at the corresponding furling opening of the water-stop wall 8, and a gate 10 is arranged at the water discharge opening. The gradually contracted closing opening is designed at one side of the inner tank 301, which is positioned at the slag discharging tank 9, so that suspended substances can drift toward the water discharging opening when the water discharging opening is opened, and then enter the slag discharging tank 9. The gate 10 is connected with a driving device, a floating ball liquid level switch 11 is arranged in the inner tank 301, the floating ball liquid level switch 11 is electrically connected with the driving device, a first pipeline 12 connected with the flocculation chelation reactor 2 is arranged at the bottom of the inner tank 301, and a second pipeline 13 connected with the buffer tank 4 is arranged on the side wall of the outer tank 302.

Further, be equipped with an inverted U type mount 14 on the water-stop wall 8, drive arrangement includes servo motor 15, incomplete gear 16 and actuating lever 17, the connection of actuating lever 17 lower extreme is at gate 10 top, and the upper end of actuating lever 17 slides and cup joints at mount 14 top, is equipped with longitudinal arrangement's tooth profile 18 on the actuating lever 17, servo motor 15 fixes the one side at mount 14, and servo motor 14's pivot 19 perpendicular to actuating lever 17 sets up and extends to actuating lever 17 department, incomplete gear 16's border partly is equipped with tooth profile 1601, and another part is smooth arc limit 1602, and incomplete gear 16 connects at the end of pivot 19 and its tooth profile 1601 is connected with tooth profile 18 meshing, servo motor 15 and float level switch 11 electric connection. The smooth arc edge 1602 of the incomplete gear 16 is a part of the circumference of the tooth root where the tooth edge 1601 is located, the arc length of the smooth arc edge 1602 is one fourth of the circumference of the tooth root, and the stroke of the rack gear 18 is greater than or equal to the stroke when the tooth edge 1601 is straightened. A boosting rod 20 perpendicular to the surface of the incomplete gear 16 is arranged on the surface of the incomplete gear at the beginning of the tooth edge 1601, and a lifting rod 21 perpendicular to the driving rod 17 is arranged on one side of the upper end of the tooth rack 18.

The use principle of the driving device is as follows: when the float level switch 11 detects that the water level of the inner tank 301 exceeds the lowest point of the water outlet, the float level switch 11 sends a pulse signal to the servo motor 15, the servo motor 15 immediately starts and controls the rotating shaft 19 to rotate for one circle after receiving the pulse signal, so as to drive the incomplete gear 16 to rotate for one circle, the encoder of the servo motor 15 is programmed in advance, the rotating shaft is controlled to rotate for 360 degrees, namely one circle, after receiving the pulse signal, the starting position of the incomplete gear 16 is set to be that the boosting rod 20 is just positioned below the lifting rod 21, at the moment, the driving rod is at the lowest position, and is also the lowest position when the gate 10 is completely closed at the water outlet, so that when the incomplete gear 16 starts to rotate, the tooth edge 1601 is just meshed with the tooth strip 18, the boosting rod 20 rotates along with the incomplete gear 16, and therefore, the boosting rod has a tendency of moving upwards, can promote the lifting lever 21 to shift up to drive actuating lever 17 and shift up slightly and make tooth edge 1601 and tooth rack 18 mesh smoothly, then drive actuating lever 17 through the rotation of tooth edge 1601 and move up, lifting lever 21 just separates with boosting rod 20, and actuating lever 17 drives gate 10 and shifts up, thereby opens the drain outlet, and the portable area of waste water that exceeds the drain outlet lowest position takes the suspended type material that floats on the surface to get into and arrange sediment pond 9, realizes the purpose of the suspended type material of discharge. When the incomplete gear 16 rotates to the smooth arc edge 1602, the smooth arc edge 1602 does not contact with the rack 18, so that the driving rod 17 falls under the action of gravity of the gate 10 under the lifting without external force, the gate 10 is closed again until the liquid level rises to the set water level again, the float ball liquid level switch 11 sends a pulse signal to the servo motor 15 again, and the operation of opening and closing the gate is repeated.

Furthermore, the inner side of the upper end of the partition wall 6 is provided with a circle of blowing holes 22, the suspended substances can be floated towards the middle of the inner tank 301 by the airflow blown out from the blowing holes 22, so that the suspended substances are prevented from being attached to the side wall of the inner tank 301, the suspended substances can smoothly flow out from the water outlet when the gate 10 is opened, the part of the partition wall 6 connected with the floatation tank 3 is of an arc structure, the arc structure can enable the bubbles to smoothly carry the suspended substances to float upwards, and the partition wall 6 is prevented from blocking and blocking the suspended substances at the lower part of the partition wall 6 to form a dead angle. A filter screen 23 is arranged on the side wall of the slag discharging pool 9 below the water outlet, a reflux pump 24 is arranged at the bottom of the slag discharging pool 9, a reflux pipe 25 arranged on the reflux pump 24 is communicated with the air floatation pool 3, the filter screen 23 can intercept suspended substances, and the wastewater enters the air floatation pool 3 again through the reflux pump 24.

Further, flocculation chelate reactor 2 is including the chelation reation kettle 201, coagulation reaction cauldron 202 and the flocculation reaction cauldron 203 that connect gradually, be connected with salt piggy bank 26 on the chelation reation kettle 201, be connected with coagulant piggy bank 27 on the coagulation reaction cauldron 202, be connected with flocculating agent piggy bank 28 on the flocculation reaction cauldron 203, all be equipped with agitating unit in chelation reation kettle 201, coagulation reaction cauldron 202 and the flocculation reaction cauldron 203, and chelation reation kettle 201 lower part is equipped with pipeline three 29 and is connected with oil interceptor 1, and flocculation reaction cauldron 202 upper portion is connected with interior pond 301 bottom through pipeline one 12, buffer pool 4 is connected with anaerobic reaction tower 5 bottom through pipeline four 30. The bottom of the inner pool 301 is connected with a sludge storage tank 32 through a sludge discharge pipe 31, the bottoms of the chelation reaction kettle 201, the coagulation reaction kettle 202 and the flocculation reaction kettle 203 are respectively provided with an emptying branch pipe, the emptying branch pipes are respectively connected to an emptying header pipe, and the emptying header pipe is connected to the sludge storage tank 32. Sludge generated after wastewater treatment in the flocculation chelate reactor 201 and the air flotation tank 3 is discharged into a sludge storage tank 32 through an emptying pipe and a sludge discharge pipe 31 respectively.

As shown in fig. 5, a treatment process for treating wastewater containing soluble fatty acids by using the pretreatment apparatus for wastewater containing soluble fatty acids is characterized by comprising the following steps:

1) oil removal regulation: the wastewater to be treated is pumped into an oil separation tank 1, the water quality and the water quantity are adjusted after oil separation, and the pH is controlled to be 6-9;

2) chelating and flocculating treatment: lifting the wastewater after oil removal regulation to a chelating reactor 2 for treatment, chelating the polycarbon fatty acid by calcium salt to generate colloid substances, then performing coagulation treatment by a coagulant, and strengthening by a flocculating agent to generate large-particle alum floc;

3) air floatation treatment: the wastewater after the chelation and flocculation is subjected to air floatation treatment in an air floatation tank 3 to remove suspended substances in the wastewater;

4) anaerobic treatment: carrying out anaerobic treatment on the wastewater subjected to air floatation treatment by using a high-efficiency anaerobic reaction tower 5;

5) and treating the wastewater after the anaerobic treatment by an aerobic biochemical treatment system, and marking and discharging.

Finally, it should be noted that: these embodiments are merely illustrative of the present invention and do not limit the scope of the present invention. In addition, other variations and modifications will be apparent to persons skilled in the art based on the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.