阅读说明：本技术 一种雨水回收利用的工艺方法及净化系统 (Process method for recycling rainwater and purification system ) 是由 曾佳 李明 伍俊锋 谢旺清 毛鹏 刘俊杰 黎锡棠 张德军 叶俊兴 于 2021-07-29 设计创作，主要内容包括：本发明公开了一种雨水回收利用的工艺方法及净化系统,包括雨水收集处理、初雨弃流处理、一级过滤处理、雨水存储处理、加药处理、混凝处理、二级过滤处理、消毒处理、汇集处理、杀菌处理,先对水质较差的初期雨水进行弃流处理,通过弃流排水管将初期雨水排入市政污水管线,便于对后期较为清澈的雨水进行收集储存,达到雨水净化的目的,实现雨水的回收利用。(The invention discloses a process method for recycling rainwater and a purification system, which comprises rainwater collection treatment, primary rainwater discarding treatment, primary filtering treatment, rainwater storage treatment, chemical adding treatment, coagulation treatment, secondary filtering treatment, disinfection treatment, collecting treatment and sterilization treatment.)

1. A process method for recycling rainwater is characterized by comprising the following steps: the process method comprises the following steps:

step 1) rainwater collection treatment: collecting rainwater by adopting a rainwater collecting pipe;

step 2) initial rain flow discarding treatment: rainwater collected by the rainwater collecting pipe is drained through a flow-discarding drainage pipe, and initial rainwater is drained into a rainwater well through the flow-discarding drainage pipe;

step 3), primary filtration treatment: after the initial rain is drained, the rest rain water is subjected to primary filtration through an automatic filtration device;

step 4), rainwater storage treatment: the rainwater filtered by the automatic filtering device enters a rainwater storage tank through a water inlet pipe;

step 5), adding medicine: rainwater in the rainwater storage tank flows into a dosing device under the action of a rainwater lifting pump, and the dosing device puts a coagulating agent into water;

step 6) coagulation treatment: the rainwater added with the coagulating agent flows into the coagulation reactor through the communicating pipe, and a coagulant passing through the coagulation reactor reacts with pollutants contained in the rainwater to generate a larger concrete;

step 7), secondary filtration treatment: starting a full-automatic filter, and performing secondary filtration on the concrete in the rainwater through the full-automatic filter;

step 8) sterilization treatment: the rainwater treated by the full-automatic filter passes through a disinfection dosing device, and disinfectant is added into the rainwater, so that the rainwater is disinfected for one time by the disinfectant;

step 9) collecting treatment: the rainwater treated by the disinfection and drug adding device flows into a clean water tank to be collected and stored so as to be recycled.

2. A process for the recovery and utilization of rainwater according to claim 1, characterized in that: the process further comprises:

step 10), sterilization treatment: rainwater in the clear water pond flows to the ultraviolet disinfector through the outlet pipe, disinfects and the secondary disinfection through the rainwater that the ultraviolet disinfector flowed to the clear water pond, and the rainwater after disinfecting and the secondary disinfection passes through the outlet pipe and supplies to each water point.

3. A process for the recovery and utilization of rainwater according to claim 1, characterized in that: and 4, a sewage pump is arranged in the rainwater storage tank, the rainwater storage tank discharges sludge at the bottom of the tank by opening the sewage pump, a flushing pump is arranged on one side of the sewage pump, and the rainwater storage tank flushes the bottom of the tank through the flushing pump so that the sewage pump discharges the sludge.

4. A process for the recovery and utilization of rainwater according to claim 1, characterized in that: when the water level of the clean water tank in the step 9 is reduced to the middle water level and the water level of the rainwater storage tank is higher than the lowest water level, the rainwater lift pump is started to supply water to the clean water tank; and when the water level of the rainwater storage tank is reduced to the lowest water level or the water level of the clean water tank is increased to the high water level, the rainwater lifting pump is closed.

5. A process for the recovery and utilization of rainwater according to claim 2, characterized in that: the rainwater supply pump is arranged on the water outlet pipe, when the rainwater supply treatment capacity of the clean water tank is large, the water level of the clean water tank is reduced to the middle water level, and the supply treatment capacity of rainwater is improved by the rainwater supply pump additionally arranged at the position of the water outlet pipe of the clean water tank.

6. A rainwater recycling purification system comprising the dosing device as claimed in claim 1, characterized in that: the dosing device adds the medicine pump including adding explosive barrel, agitator, measurement, the measurement adds in the explosive pump and the agitator all places adds the explosive barrel in, the one side that the measurement adds the explosive pump is located to the agitator, it has the medicament of coagulating to store in the explosive barrel, the medicament evenly distributed that the agitator stirs the medicament of coagulating in the messenger's medicament of coagulating in to adding the explosive barrel and does not form the sediment, the measuring pump is to the rainwater transport coagulation agent of preparing in the intercommunication pipe.

7. A rainwater recycling purification system according to claim 6, characterised in that: the clean system includes dredge pump, rainwater elevator pump, tank level detector, clean water basin liquid level detector, rainwater working shaft, PLC switch board, dredge pump, rainwater elevator pump, tank level detector, clean water basin liquid level detector, rainwater working shaft are connected in order to realize the control of PLC switch board to its operating condition by PLC switch board electricity, tank level detector locates in the rainwater tank in order to realize the liquid level detection to the rainwater tank, clean water basin liquid level detector locates in the clean water basin in order to realize the liquid level detection to the clean water basin, the liquid level condition transmission that tank level detector and clean water basin liquid level detector detected is for the PLC switch board, the PLC switch board receives the data condition of rainwater tank and clean water basin liquid level and from controlling opening and close of rainwater elevator pump.

8. A rainwater recycling purification system according to claim 6, characterised in that: the purification system comprises a full-automatic filter, a multi-media filter and a disinfectant dosing device, the multi-media filter is arranged between the full-automatic filter and the disinfectant dosing device and comprises a filter cylinder body and a filter material assembly, the filter material assembly is arranged in the filter cylinder body, the filter cylinder body is provided with a back flushing air pipe, the multi-media filter adsorbs and filters concrete and suspended impurities in rainwater through the filter material assembly to enable the rainwater to become clear through three times of filtration, and the multi-media filter back flushes impurities and stains adsorbed on the surface of the filter material assembly through the back flushing air pipe.

9. A rainwater recycling purification system according to claim 8, characterised in that: the multi-medium filter is provided with a drain pipe and a drain outlet arranged at the tail end of the drain pipe, and stains after the multi-medium filter is subjected to back washing are discharged from the drain outlet of the drain pipe.

10. A rainwater recycling purification system according to claim 7, characterised in that: the purification system comprises a water supplementing network pipe and a backflow preventer arranged on the water supplementing network pipe, the clean water tank supplements water through the water supplementing network pipe, and the clean water tank prevents water in the water supplementing network pipe from flowing backwards through the backflow preventer.

Technical Field

The invention relates to the technical field of rainwater recycling, in particular to a rainwater recycling process method and a purification system.

Background

The lack of water resources has become a worldwide problem, and when the traditional water resource development mode can not increase water resources any more, the rainwater is recycled to become an economic and practical water resource development mode.

At present, the collection and utilization of rainwater has important significance for cities in China, particularly for cities with serious water shortage, in the prior art, the collection, storage and utilization of rainwater has various modes, such as a current collecting surface form with a natural slope surface, a road surface and an artificial rain collecting field, and natural current collection is relied on, the northern area adopts a mode of combining the artificial current collecting field or the natural current collecting field with an artificial interception measure, and the like, although the collection, storage and recovery of rainwater are realized, along with the development of urban science and technology, the emission of automobiles, buildings, chemical engineering and industry and the continuous growth of domestic garbage, pollutants carried in the rainwater contain a large amount of suspended particles, floaters, organic matters, heavy metals, bacteria and the like, and the highest value of pollutant indexes of rainwater in some areas is far higher than that of domestic sewage and cannot be recycled.

Therefore, it is desirable to provide a process and a purification system for initial rainwater drainage and purification treatment of rainwater.

Disclosure of Invention

In order to overcome the defects that pollutants and bacteria are carried in rainwater, the rainwater cannot be recycled and the like in the prior art, the invention aims to solve the technical problem of providing a process method and a purification system which can drain initial rainwater, filter, disinfect and sterilize the rainwater and recycle the rainwater.

In order to solve the technical problem, the invention provides a process method for recycling rainwater, which comprises the following steps:

step 1) rainwater collection treatment: collecting rainwater by adopting a rainwater collecting pipe;

step 2) initial rain flow discarding treatment: rainwater collected by the rainwater collecting pipe is drained through a flow-discarding drainage pipe, and initial rainwater is drained into a rainwater well through the flow-discarding drainage pipe;

step 3), primary filtration treatment: after the initial rain is drained, the rest rain water is subjected to primary filtration through an automatic filtration device;

step 4), rainwater storage treatment: the rainwater filtered by the automatic filtering device enters a rainwater storage tank through a water inlet pipe;

step 5), adding medicine: rainwater in the rainwater storage tank flows into a dosing device under the action of a rainwater lifting pump, and the dosing device puts a coagulating agent into water;

step 6) coagulation treatment: the rainwater added with the coagulating agent flows into the coagulation reactor through the communicating pipe, and a coagulant passing through the coagulation reactor reacts with pollutants contained in the rainwater to generate a larger concrete;

step 7), secondary filtration treatment: starting a full-automatic filter, and performing secondary filtration on the concrete in the rainwater through the full-automatic filter;

step 8) sterilization treatment: the rainwater treated by the full-automatic filter passes through a disinfection dosing device, and disinfectant is added into the rainwater, so that the rainwater is disinfected for one time by the disinfectant;

step 9) collecting treatment: the rainwater treated by the disinfection and drug adding device flows into a clean water tank to be collected and stored so as to be recycled.

Preferably, the process further comprises:

step 10), sterilization treatment: rainwater in the clear water pond flows to the ultraviolet disinfector through the outlet pipe, disinfects and the secondary disinfection through the rainwater that the ultraviolet disinfector flowed to the clear water pond, and the rainwater after disinfecting and the secondary disinfection passes through the outlet pipe and supplies to each water point.

Preferably, in step 4 be provided with the dredge pump in the rainwater tank, the rainwater tank is through opening the mud pump and draining the mud of bottom of the pool, one side of dredge pump is provided with the flush pump, the rainwater tank is washed the bottom of the pool so that the dredge pump is arranged mud.

Preferably, when the water level of the clean water tank in the step 9 is reduced to the middle water level and the water level of the rainwater storage tank is higher than the lowest water level, the rainwater lift pump starts to supply water to the clean water tank; and when the water level of the rainwater storage tank is reduced to the lowest water level or the water level of the clean water tank is increased to the high water level, the rainwater lifting pump is closed.

Preferably, the outlet pipe is provided with a rainwater supply pump, when the rainwater supply treatment capacity of the clean water tank is larger, the water level of the clean water tank is reduced to the middle water level, and the clean water tank improves the supply treatment capacity of rainwater by the rainwater supply pump additionally arranged at the outlet pipe.

In addition, the invention also provides a purification system for recycling the rainwater, which comprises a dosing device, wherein the dosing device comprises a dosing barrel, a stirrer and a metering dosing pump, the metering dosing pump and the stirrer are both arranged in the dosing barrel, the stirrer is arranged on one side of the metering dosing pump, coagulating medicaments are stored in the dosing barrel, the stirrer is used for stirring the coagulating medicaments in the dosing barrel to ensure that the medicaments in the coagulating medicaments are uniformly distributed and do not form precipitates, and the metering pump is used for conveying the prepared coagulating medicaments to the rainwater in the communication pipe.

Preferably, clean system includes dredge pump, rainwater elevator pump, tank level detector, clean water basin level detector, rainwater working shaft, PLC switch board, dredge pump, rainwater elevator pump, tank level detector, clean water basin level detector, rainwater working shaft are connected in order to realize PLC switch board to its operating condition's control by PLC switch board electricity, tank level detector locates in the rainwater tank in order to realize the level detection to the rainwater tank, clean water basin level detector locates in the clean water basin in order to realize the level detection to the clean water basin, the liquid level condition transmission that tank level detector and clean water basin level detector detected is for the PLC switch board, the PLC switch board receives the data condition of rainwater tank and clean water basin liquid level and from controlling opening and close of rainwater elevator pump.

Preferably, the purification system comprises a full-automatic filter, a multi-media filter and a disinfectant dosing device, the multi-media filter is arranged between the full-automatic filter and the disinfectant dosing device and comprises a filter cylinder body and a filter material assembly, the filter material assembly is arranged in the filter cylinder body, the filter cylinder body is provided with a back flushing air pipe, the multi-media filter adsorbs and filters concrete and suspended impurities in rainwater through the filter material assembly to realize three-time filtration of the rainwater, so that the rainwater becomes clear, and the multi-media filter back flushes impurities and stains adsorbed on the surface of the filter material assembly through the back flushing air pipe.

Preferably, the multi-media filter is provided with a drain pipe and a drain outlet arranged at the tail end of the drain pipe, and stains after the multi-media filter is subjected to back washing are discharged from the drain outlet of the drain pipe.

Preferably, the purification system comprises a water replenishing network pipe and a backflow preventer arranged on the water replenishing network pipe, the clean water tank replenishes water through the water replenishing network pipe, and the clean water tank prevents water backflow in the water replenishing network pipe through the backflow preventer.

Compared with the prior art, the scheme of the invention at least comprises the following beneficial effects:

the invention provides a process method for recycling rainwater, which comprises rainwater collection treatment, primary rainwater discarding treatment, primary filtering treatment, rainwater storage treatment, dosing treatment, coagulation treatment, secondary filtering treatment, disinfection treatment, aggregation treatment and sterilization treatment, wherein the primary rainwater with poor water quality is firstly discarded, the primary rainwater is drained into a municipal sewage pipeline through a discarding drainage pipe, so that the rainwater with clearer later period is conveniently collected and stored, the primary filtering is carried out through a full-automatic filter, pollutants in the rainwater are polymerized into a concrete through a dosing device and the coagulation treatment, the multi-stage filtering is carried out through the full-automatic filter and a multi-medium filter, so that the rainwater is clear, the rainwater which meets the water quality standard is disinfected through dosing of a disinfectant dosing device, and is collected into a clear water tank, and finally the rainwater is disinfected again through an ultraviolet sterilizer, the rainwater can be purified and recycled by the process method provided by the invention, and the problems that the existing rainwater contains suspended particles, floating objects, bacteria and other pollutants, and is inconvenient to recycle are solved.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a process flow diagram for rainwater recycling according to the present invention;

FIG. 2 is a diagram of a rainwater recycling purification system of the present invention;

FIG. 3 is an enlarged detail schematic view of the multi-media filter of FIG. 2 of the present invention;

fig. 4 is a signal flow diagram of the PLC control cabinet of the present invention.

In the figure: the device comprises a rainwater collecting pipe 1, a rainwater well 2, a flow abandoning drain pipe 3, an automatic filtering device 4, a rainwater storage tank 5, a sewage pump 51, a flushing pump 52, a storage tank liquid level detector 53, a water inlet pipe 54, a rainwater lift pump 6, a dosing device 7, a dosing barrel 71, a stirrer 72, a metering dosing pump 73, a communicating pipe 74, a coagulation reactor 8, a full-automatic filter 9, a multi-medium filter 10, a filtering cylinder 101, a filtering material assembly 102, a backwashing air pipe 103, a sewage pipe 104, a sewage outlet 105, a double-hole exhaust valve 106, a disinfection dosing device 11, a clean water tank 12, a water outlet pipe 121, a clean water tank liquid level detector 122, a water replenishing network pipe 123, a backflow preventer 124, a rainwater water supply pump 13, an ultraviolet sterilizer 14 and a PLC control cabinet 15.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "inside", "upper", "lower", "one side", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are used broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, elastically connected, indirectly connected through an intermediate medium, or connected between two elements.

As shown in fig. 1, the invention relates to a process method for recycling rainwater, which comprises the following steps:

step 1) rainwater collection treatment: collecting rainwater by adopting a rainwater collecting pipe 1;

step 2) initial rain flow discarding treatment: rainwater collected by the rainwater collecting pipe 1 is drained through the drainage pipe 3, and initial rainwater is drained into the rainwater well 2 through the drainage pipe 3;

step 3), primary filtration treatment: after the initial rain is drained, the rest rain water is subjected to primary filtration through the automatic filtration device 4;

step 4), rainwater storage treatment: the rainwater filtered by the automatic filtering device 4 enters the rainwater storage tank 5 through the water inlet pipe 54;

step 5), adding medicine: rainwater in the rainwater storage tank 5 flows into the dosing device 7 under the action of the rainwater lifting pump 6, and the dosing device 7 puts a coagulating agent into water;

step 6) coagulation treatment: the rainwater added with the coagulating agent flows into the coagulation reactor 8 through the communicating pipe 74, and the coagulant passing through the coagulation reactor 8 reacts with pollutants contained in the rainwater to generate a larger concrete;

step 7), secondary filtration treatment: starting the full-automatic filter 9, and performing secondary filtration on the concrete in the rainwater through the full-automatic filter 9;

step 8) sterilization treatment: the rainwater treated by the full-automatic filter 9 passes through a disinfection dosing device 11, and disinfectant is added into the rainwater, so that the rainwater is disinfected for one time by the disinfectant;

step 9) collecting treatment: the rainwater treated by the disinfection and drug adding device 11 flows into a clean water tank 12 for collection and storage so as to be recycled;

step 10), sterilization treatment: rainwater in the clean water tank 12 flows to the ultraviolet sterilizer 14 through the water outlet pipe 121, the rainwater flowing from the clean water tank 12 is sterilized and secondarily sterilized by the ultraviolet sterilizer 14, and the sterilized and secondarily sterilized rainwater is supplied to each water using point through the water outlet pipe 121.

As shown in figures 2-4, when the invention is implemented, the bottom elevation of the rainwater well 2 is lower than the elevation of the drainage pipe 3, the elevation of the rainwater collecting pipe 1 is higher than the elevation of the drainage pipe 3, a water quality sensor is arranged in the rainwater well 2, the water quality sensor is electrically connected with a switch controller on the rainwater collecting pipe 1, when the water quality sensor senses the rain, the water quality sensor transmits a signal to the switch controller, the switch controller controls the on-off of the rain water collecting pipe 1, then rainwater is collected, the rainwater well 2 arranged in the rainwater collecting pipe can ensure the drainage safety of the system and can reduce the investment of the system, the pipe diameter of the rainwater collecting pipe 1 is DN300, the pipe diameter of the drainage pipe 3 is DN100, the cost investment of a pipe network and subsequent flow discarding treatment equipment is reduced by the difference of the pipe diameters between the flow discarding drain pipe 3 and the rainwater collecting pipe 1.

When the automatic filtering device 4 is realized, the automatic filtering device 4 adopts natural sedimentation, most pollutants in rainwater are removed through the natural sedimentation, energy can be saved, and the loss of the automatic filtering device 4 is reduced.

The invention adopts the ultraviolet sterilizer 14 to sterilize and disinfect the rainwater flowing out of the clean water tank 12, the ultraviolet sterilizer 14 utilizes ultraviolet rays to kill harmful microorganisms and viruses in the rainwater, and no disinfection by-products are generated, thereby improving the environmental protection.

According to the invention, the sewage pump 51 is arranged in the rainwater storage tank 5, sludge at the bottom of the rainwater storage tank 5 is discharged by starting the sewage pump, the flushing pump 52 is also arranged at one side of the sewage pump 51, and the bottom of the rainwater storage tank 5 is flushed by the flushing pump 52, so that the sewage pump 51 can conveniently discharge the sludge.

When the water level of the clean water tank 12 is reduced to the middle water level and the water level of the rainwater storage tank 5 is higher than the lowest water level, the rainwater lift pump 6 is started to supply water to the clean water tank 12; when the water level of the rainwater storage tank 5 is lowered to the lowest water level or the water level of the clean water tank 12 is raised to the high water level, the rainwater lift pump 6 is turned off.

The rainwater supply pump 13 is arranged on the water outlet pipe 121, and when the rainwater supply treatment capacity of the clean water tank 12 is large and the water level of the clean water tank is reduced to the middle water level, the clean water tank is pressurized by the rainwater supply pump 13 additionally arranged at the water outlet pipe 121, so that the rainwater supply treatment capacity is improved.

In addition, the invention also provides a purification system for recycling rainwater, which comprises a dosing device 7, wherein the dosing device 7 comprises a dosing barrel 71, a stirrer 72 and a metering dosing pump 73, the metering dosing pump 73 and the stirrer 72 are both arranged in the dosing barrel 71, the stirrer 72 is arranged at one side of the metering dosing pump 73, coagulating medicament is stored in the dosing barrel 71, the coagulating medicament in the dosing barrel 71 is stirred by the stirrer 72, so that the medicament in the coagulating medicament is uniformly distributed without forming precipitates, the prepared coagulating medicament is conveyed to the rainwater in a communicating pipe 74 by a metering pump, the coagulating medicament has polymerization effect on suspended substances or pollutants contained in the rainwater, and after the coagulating medicament is mixed with the rainwater and enters the coagulation reactor 8, the coagulating medicament reacts with the pollutants in the rainwater to generate a larger coagulated body, the method is characterized in that pollutants in rainwater are gathered to form a large concrete, and then the large concrete is separated from the rainwater through a full-automatic filter 9. when the method is specifically implemented, the concrete is polyaluminium chloride, the polymerization effect is good, the polymerization effect is obvious, the concentration of the added concrete is 10%, the concrete is added in a mode that the concrete is a powder type, an artificial dissolved medicine is prepared according to the concentration of 10%, the artificial dissolved medicine is injected into a medicine adding barrel 71, and a metering medicine adding pump 73 automatically adds the concrete.

Specifically, the dosing barrel 71 is made of PE (polyethylene) materials, and has strong corrosion resistance.

As shown in fig. 4, the signal flow diagram of the PLC control cabinet of the present invention relates to a purification system of the present invention, and specifically, the purification system of the present invention includes a sewage pump 51, a rainwater lift pump 6, a water storage tank liquid level detector 53, a clean water tank liquid level detector 122, a rainwater supply pump 13, and a PLC control cabinet 15, wherein the sewage pump 51, the rainwater lift pump 6, the water storage tank liquid level detector 53, the clean water tank liquid level detector 122, and the rainwater supply pump 13 are all electrically connected by the PLC control cabinet 15, so as to realize the control of the PLC control cabinet 15 on the working state thereof.

When the invention is specifically implemented, the water storage tank liquid level detector 53 is arranged in the rainwater storage tank 5, the liquid level of the rainwater storage tank 5 is detected by the water storage tank liquid level detector 53, the clear water tank liquid level detector 122 is arranged in the clear water tank 12, the liquid level of the clear water tank 12 is detected by the clear water tank liquid level detector 122, the detected liquid level condition is transmitted to the PLC control cabinet 15 by the water storage tank liquid level detector 53 and the clear water tank liquid level detector 122, the opening and closing of the rainwater lifting pump 6 are controlled by the liquid level condition of the rainwater storage tank 5 and the clear water tank 12 received by the PLC control cabinet 15, and when the water level of the clear water tank 12 is detected by the clear water tank liquid level detector 122 to be reduced to the middle water level and the water level of the rainwater storage tank 5 is higher than the lowest water level, the PLC control cabinet 15 controls the opening of the rainwater lifting pump 6 to supply water to the clear water tank 12; when the water level of the rainwater storage tank 5 is reduced to the lowest water level or the water level of the clean water tank 12 is increased to the high water level, the PLC control cabinet 15 controls the rainwater lifting pump 6 to be closed.

The purification system comprises a full-automatic filter 9, a multi-media filter 10 and a disinfectant dosing device 7, wherein the multi-media filter 10 is arranged between the full-automatic filter 9 and the disinfectant dosing device 7, the multi-media filter 10 comprises a filter cylinder 101 and a filter material assembly 102, the filter material assembly 102 is arranged in the filter cylinder 101, the filter cylinder 101 is provided with a backwashing air pipe 103, the multi-media filter 10 adsorbs and filters concrete and suspended impurities in rainwater through the filter material assembly 102, multiple filtering of the rainwater is realized, the rainwater is clarified, and the multi-media filter 10 backflushes impurities and stains adsorbed on the surface of the filter material assembly 102 through the backwashing air pipe 103.

When the embodiment of the invention is specifically realized, the filter material assembly 102 adopts quartz sand and activated carbon as filter materials, adopts the quartz sand to remove suspended matters in water, obviously removes colloid, iron, organic matters, pesticide, manganese, bacteria, viruses and other pollutants in the water, adopts the quartz sand as the filter material, has strong adaptivity to rainwater concentration, operation conditions, pretreatment process and the like, can fully disperse the filter materials during back washing, and has good cleaning effect; the activated carbon is used as a filter material, so that the color, the taste, the residual chlorine and organic matters in the rainwater can be removed, and the activated carbon is mainly used for filtering under the adsorption action of the activated carbon.

Specifically, the disinfectant agent added into the rainwater by the disinfectant dosing device 7 is a sodium hypochlorite solution, and the rainwater is disinfected by the sodium hypochlorite solution to eliminate bacteria and viruses in the rainwater, so that the index of the rainwater meets the standard water quality requirement.

Specifically, after the multi-media filter 10 is used for a certain period, a certain amount of impurities and stains are left and absorbed on a filter material layer of the filter material assembly 102, so that the quality of outlet water of the multi-media filter 10 is reduced, and therefore the multi-media filter 10 needs to be backwashed.

In the embodiment of the present invention, when the double-hole exhaust valve 106 is disposed at the top of the multimedia filter 10, most of the backwash air should be exhausted through the double-hole exhaust valve 106 when the backwash air is collected at the top of the multimedia filter 10.

Specifically, the purification system of the present invention includes a water supply network pipe 123 and a backflow preventer 124 disposed on the water supply network pipe 123, the clean water tank 12 supplies water through the water supply network pipe 123, and the backflow preventer 124 prevents backflow of water in the water supply network pipe 123.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.