CN111646656A - Refined regulation and control system suitable for purification and reuse of public building rainwater of multiple water sources - Google Patents
Refined regulation and control system suitable for purification and reuse of public building rainwater of multiple water sources Download PDFInfo
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F1/5281—Installations for water purification using chemical agents
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- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
- C02F2003/003—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms using activated carbon or the like
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- C02F2209/005—Processes using a programmable logic controller [PLC]
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- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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- C02F2209/11—Turbidity
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- C02F2209/20—Total organic carbon [TOC]
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- C02F2209/40—Liquid flow rate
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- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
A refined regulation and control system for purifying and recycling public building rainwater suitable for various water sources belongs to the technical field of rainwater recycling in the building category. Including the rainwater tank, promote the pump package, online flow detector, online pollutant detects instrument cluster, coagulant dosing mixing arrangement, quartz sand filter equipment, biological activity charcoal filter equipment, the motorised valve, the membrane is strained the device, disinfectant dosing device, the clean water basin, the level gauge, PLC regulates and control the device, and connect the pipeline etc. of above-mentioned device, according to the kind of different water sources water and the change of water pollution degree, adopt the regulation and control that becomes more meticulous of treatment process flow, realized that all kinds of water sources water efficient are handled and deep purification, can satisfy the demand of different water quality standards simultaneously.
Description
Technical Field
The invention belongs to the technical field of rainwater recycling in the building category, and particularly relates to a public building rainwater purification and recycling regulation and control system suitable for multiple water sources.
Background
Public buildings have the characteristics of various types, large quantity, high water consumption and the like, and are the key points of water conservation and water consumption. The roof, the road, the green land and the like of the public building area are provided with rainwater collecting systems, so that a large amount of rainwater can be collected. The rainwater treatment process flow is simple, and the treated or purified rainwater can be used for road cleaning, greening, fire fighting, cleaning, toilet flushing, construction and the like of public buildings, so that the problem of large water consumption of the public buildings is solved to a great extent, the water consumption rate can be effectively improved, the water consumption is saved, and the rainwater treatment process flow is an important source-opening measure of water resources.
The rainwater collected by the public building can meet part of water requirements with lower water quality requirements after passing through corresponding treatment process flows, such as circulating cooling water replenishing, landscape water, greening watering, road cleaning, fire fighting, vehicle cleaning, ground washing, toilet flushing, construction and the like.
The rainwater has the characteristics of light pollution, low organic matter content, small hardness and the like, the water quantity and the water quality of the rainwater are easily influenced by factors such as seasons, geographical positions, building types and the like, and main pollutants in the rainwater mainly comprise SS (suspended substances) and organic matters, and also comprise nitrogen and phosphorus nutrient elements, microorganisms and the like. At present, the purification and the reuse of rainwater resources are mainly realized by a treatment method combining physical and chemical methods such as a coagulation-precipitation method, a filtration-adsorption method and the like. After precipitation, cleaner rainwater can remove 70% of suspended matters and 40% of organic pollutants, and can be directly reused for green land irrigation; in the rainwater with serious pollution degree, the coagulating sedimentation can only remove about 70 percent of pollutants, and the filtering treatment and the biological treatment are also needed. For the water demand with higher water quality requirement, a membrane filtration purification technology can be adopted, and a membrane filtration treatment unit is added.
However, due to the discontinuity of rainwater, the rainwater cannot be collected and stored at any time, and when the rainwater cannot be used satisfactorily, water in public buildings or water from other water sources can be used as an available supplementary water source. At the moment, the quality of the collected water of various water sources is greatly different, and more treatment process flows are needed to ensure that the quality of the treated water reaches the standard; therefore, a biological activated carbon filtering device and a membrane filtering device are added on the basis of the conventional coagulation-filtration treatment process. Different treatment processes and operation modes are required to be adopted according to different source water and the change of the types and the contents of pollutants so as to ensure that the pollutants are effectively removed and the quality of the effluent can reach the water quality standard of water in the related field. Under the background, a public building rainwater purification and reuse regulation and control system suitable for various water sources is provided on the basis of meeting the water quality standards of water used in related fields and industries, and the fine regulation and control of the treatment process flow is performed when various water sources of a public building are reused, so that the efficient removal of pollutants and the deep purification of water quality are fully guaranteed.
Disclosure of Invention
The invention aims to solve the problems of purification and reuse of rainwater of public buildings or water of various water sources, and provides a refined regulation and control system for purification and reuse of rainwater of public buildings suitable for water of various water sources, so as to meet part of water requirements with lower requirements on water quality and realize reasonable utilization of water resources.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a public building rainwater purifies and regulation and control system that becomes more meticulous of retrieval and utilization suitable for multiple water supply water which characterized in that includes:
the device comprises a rainwater storage tank, a lifting pump group, an online flow detector, an online pollutant detection instrument group, a coagulant dosing and mixing device, a quartz sand filtering device, a biological activated carbon filtering device, an electric valve, a membrane filtering device, a disinfectant dosing device, a clean water tank, a liquid level meter, a PLC (programmable logic controller) regulating and controlling device, a pipeline for connecting the devices and the like.
The fine regulation and control system suitable for purifying and recycling the rainwater of the public building of various water sources is characterized in that a rainwater storage tank (1), a lifting pump set (2), an online flow detector (3), a coagulant dosing and mixing device (4), a quartz sand filtering device (5), a biological activated carbon filtering device (6), an online pollutant detection instrument set (7), a first electric valve (8), a membrane filtering device (9), a disinfectant dosing device (10) and a clean water tank (11) are sequentially connected, the clean water tank (11) is provided with a liquid level meter (12), a return pipe (13) is arranged in front of the first electric valve (8), the return pipe (13) is connected with the rainwater storage tank (1) through a second electric valve (14), a branch pipeline is arranged in front of the second electric valve (14), and the branch pipeline is connected with a water suction pipe in front of the lifting pump set (2) through a third electric valve (15), namely, the pipeline connection between the rainwater storage tank (1) and the lifting pump set (2) is called as a water suction pipe; the system comprises a lifting pump set (2), an online flow detector (3), a coagulant dosing mixing device (4), an online pollutant detection instrument set (7), a disinfectant dosing device (10), a liquid level meter (12), a first electric valve (8), a second electric valve (14) and a third electric valve (15), which are all connected with a PLC regulation and control device (16).
The fine regulation and control method for purifying and recycling the public building rainwater of various water source water by adopting the regulation and control system is characterized by comprising the following steps:
the lifting pump set (2) lifts rainwater in the rainwater storage tank (1), flows through the online flow detector (3), is added with a coagulant through the coagulant adding and mixing device (4) to be mixed with rainwater, and then is conveyed to the quartz sand filtering device (5) and the biological activated carbon filtering device (6);
under the condition of a conventional treatment process flow, when the filtered water of the biological activated carbon filtering device (6) is qualified through the detection of organic matters and turbidity indexes of the online pollutant detection instrument set (7), the first electric valve (8) is opened, and the filtered water is sequentially conveyed to the membrane filtering device (9) and the disinfectant dosing device (10) and then enters the clean water tank (11);
when the organic matter index of the online pollutant detection instrument set (7) of the filtered water is unqualified and the liquid level of the liquid level meter (12) is lower than a set lower limit threshold, switching to an internal circulation treatment process flow, closing the first electric valve (8), opening the third electric valve (15), stopping the dosing of the coagulant dosing and mixing device (4), stopping the dosing of the disinfectant by the disinfectant dosing and mixing device (10), pressurizing the filtered water again through the lifting pump set (2) through the return pipe (13), and then flowing through the online flow detector (3), the coagulant dosing and mixing device (4), the quartz sand filtering device (5) and the biological activated carbon filtering device (6) to perform internal circulation treatment process operation; when the organic matter index of the online pollutant detection instrument set (7) is detected to be qualified, the first electric valve (8) is opened, the third electric valve (15) is closed, the conventional treatment process flow is recovered, and at the moment, the coagulant dosing and mixing device (4) starts to add the medicament and the disinfectant dosing device (10) starts to add the disinfectant;
when the filtered water is unqualified in organic matter index detection of the online pollutant detection instrument set (7) and the liquid level of the liquid level meter (12) is between a set lower limit threshold and an upper limit threshold, switching to a low-load cyclic treatment process, closing the first electric valve (8), opening the third electric valve (15), stopping the chemical dosing of the coagulant dosing mixing device (4), stopping the disinfectant dosing of the disinfectant dosing mixing device (10), adjusting the flow rate of the back-filtered water of the lifting pump set (2) according to the instruction of the PLC regulating device (16), and performing slow cyclic treatment process operation through the online flow detector (3), the coagulant dosing mixing device (4), the quartz sand filtering device (5) and the biological activated carbon filtering device (6); when the organic matter index of the online pollutant detection instrument set (7) is detected to be qualified, the first electric valve (8) is opened, the third electric valve (15) is closed, the process is converted into a low-load conventional treatment process flow, filtered water flows into the clean water tank (11) after passing through the membrane filtering device (9) and the disinfectant dosing device (10), and the coagulant dosing mixing device (4) and the disinfectant dosing device (10) are both used for dosing the coagulant and the disinfectant in proper amount according to the treatment flow rate according to the instruction of the PLC regulating device (16);
when the filtered water is unqualified in organic matter index detection of the online pollutant detection instrument set (7) and the liquid level of the liquid level meter (12) is higher than a set upper limit threshold value, the process flow is converted into an external circulation treatment process, at the moment, the first electric valve (8) is closed, the second electric valve (14) is opened, the filtered water flows back to the rainwater storage tank (1), the lifting pump set (2) is adjusted to reduce the flow according to the PLC regulation and control device (16), so that the filtering time of the filtered water in the quartz sand filtering device (5) and the biological activated carbon filtering device (6) is prolonged, and at the moment, the coagulant dosing and mixing device (4) gradually reduces the coagulant dosing amount according to the turbidity detection value of the online pollutant detection instrument set (7); when the organic matter index of the online pollutant detection instrument group (7) is detected to be qualified or the liquid level of the liquid level meter (12) is between the set lower limit and the upper limit threshold value again, the first electric valve (8) is opened, the second electric valve (14) is closed, the process is converted into a low-load conventional treatment process flow, and the pump group (2) is lifted to operate until the liquid level of the liquid level meter (12) of the clean water tank reaches the highest water level and then is stopped.
The inlet water of the rainwater storage tank (1) can be building rainwater, building reclaimed water, municipal reclaimed water or other unconventional source water. The membrane filtration device (9) can adopt a microfiltration membrane or an ultrafiltration membrane, and can be a primary or secondary membrane filtration system. The agent added in the disinfection medicine-adding device (10) can be one of disinfectants such as chlorine dioxide, hypochlorite and the like, or a combination device of other disinfection methods. The coagulant used in the coagulant dosing and mixing device (4) is common coagulants such as aluminum salt and iron salt and one of various composite coagulants. The online pollutant detection instrument set (7) can detect 2 or more water quality indexes, and the detected pollutant indexes can be particulate indexes such as turbidity, suspended solids, particle number and the like, organic indexes such as UV, TOC, COD and the like, and nutrient indexes such as ammonia nitrogen, total phosphorus and the like.
The flow of the internal circulation treatment process is 1/10-1/20 of the flow of the conventional treatment process, the flow of the low-load circulation treatment process and the flow of the low-load conventional treatment process are 1/10-1/20 of the flow of the conventional treatment process, a PLC (programmable logic controller) regulates the lifting pump group (2) to realize the flow control, and the PLC regulates and controls the device (16) to carry out programming and statistical analysis calculation according to the organic matter index detection value of the online pollutant detection instrument group (7) to obtain the flow. The set upper limit threshold and the lower limit threshold of the liquid level meter (12) can be respectively and correspondingly set to be 60-70% and 30-40% of the highest designed water level of the clean water tank (11). The water discharged from the clean water tank (11) can be used for circulating cooling water replenishing, landscape water, greening, road cleaning, fire fighting, vehicle cleaning, ground washing, toilet flushing, construction and the like in public building areas.
The invention has the following advantages:
(1) the invention can realize the purification and the recycling of the rainwater of the public building and the water of various water sources, greatly broadens the application range of the rainwater treatment and recycling process of the public building to different water sources, is suitable for more water use industries and water use ways, is even suitable for the water treatment and the recycling with unstable water quality, and meets the multiple purposes.
(2) The purified water quality can meet the water quality standards of related industries and application fields including urban miscellaneous water quality standard (GBT18920-2002), the purification effect and the utilization rate of rainwater and other unconventional source water are improved, and the reasonable and efficient utilization of public building water resources can be realized.
(3) According to the variety of different water sources and the change of water quality pollution degree, the refined regulation and control of the treatment process flow is adopted, so that the high-efficiency treatment and deep purification of various water sources are realized, and the requirements of different water quality standards can be met.
Description of the drawings:
FIG. 1 is a schematic diagram of the general structure of the present invention;
in the figure, (1) -a rainwater storage tank, (2) -a lifting pump set, (3) -an online flow detector, (4) -a coagulant dosing and mixing device, (5) -a quartz sand filtering device, (6) -a biological activated carbon filtering device, (7) -an online pollutant detection instrument set, (8) -a first electric valve, (9) -a membrane filtering device, (10) -a disinfectant dosing device, (11) -a clean water tank, (12) -a liquid level meter, (13) -a return pipe, (14) -a second electric valve, (15) -a third electric valve and (16) -a PLC regulating and controlling device.
The specific implementation method comprises the following steps:
referring to fig. 1, the invention comprises a rainwater storage tank, a lift pump set, an online flow detector, an online pollutant detection instrument set, a coagulant dosing and mixing device, a quartz sand filtering device, a biological activated carbon filtering device, an electric valve, a membrane filtering device, a disinfectant dosing device, a clean water tank, a liquid level meter, a PLC (programmable logic controller) regulating device, a pipeline connected with the devices and the like;
the following further description is made in conjunction with the accompanying 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 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.
Referring to fig. 1, a lifting pump set (2) lifts rainwater in a rainwater storage tank (1), flows through an online flow detector (3), is added with a coagulant through a coagulant dosing and mixing device (4) and is mixed with the rainwater, and then is conveyed to a quartz sand filtering device (5) and a biological activated carbon filtering device (6). Under the condition of a conventional treatment process flow, when the filtered water of the biological activated carbon filtering device (6) is qualified through the organic matter and turbidity index detection of the online pollutant detection instrument set (7), the first electric valve (8) is opened, and the filtered water is sequentially conveyed to the membrane filtering device (9) and the disinfectant dosing device (10) and then enters the clean water tank (11). When the filtered water is unqualified in organic matter index detection of the online pollutant detection instrument set (7) and the liquid level of the liquid level meter (12) is lower than a set lower limit threshold, switching is performed to an internal circulation treatment process flow, at the moment, the first electric valve (8) is closed, the third electric valve (15) is opened, the coagulant dosing mixing device (4) stops dosing, the disinfectant dosing device (10) stops dosing, and the returned filtered water flows through the online flow detector (3), the coagulant dosing mixing device (4), the quartz sand filtering device (5) and the biological activated carbon filtering device (6) again after being pressurized by the lifting pump set (2) through the return pipe (13) to perform internal circulation treatment process operation. When the organic matter index of the online pollutant detection instrument set (7) is detected to be qualified, the first electric valve (8) is opened, the third electric valve (15) is closed, the conventional treatment process flow is recovered, and at the moment, the coagulant dosing and mixing device (4) starts to dose the medicament and the disinfectant dosing device (10) starts to dose the disinfectant. When the filtered water is unqualified in organic matter index detection of the online pollutant detection instrument set (7) and the liquid level of the liquid level meter (12) is between a set lower limit threshold and an upper limit threshold, switching is performed to a low-load circulation treatment process, at the moment, the first electric valve (8) is closed, the third electric valve (15) is opened, the coagulant dosing mixing device (4) stops dosing, the disinfectant dosing device (10) stops dosing, the flow rate of the back-filtered water of the lifting pump set (2) is adjusted according to the instruction of the PLC adjusting device (16), and slow circulation treatment process operation is performed through the online flow detector (3), the coagulant dosing mixing device (4), the quartz sand filtering device (5) and the biological activated carbon filtering device (6). When the organic matter index of the online pollutant detection instrument set (7) is detected to be qualified, the first electric valve (8) is opened, the third electric valve (15) is closed, the process is converted into a low-load conventional treatment process flow, filtered water flows into the clean water tank (11) after passing through the membrane filtering device (9) and the disinfectant dosing device (10), and at the moment, the coagulant dosing mixing device (4) and the disinfectant dosing device (10) are used for dosing the coagulant and the disinfectant in proper amount according to the treatment flow according to the instruction of the PLC regulating device (16). When the organic matter index of straining back water through on-line pollutant detection instrument cluster (7) detects nonconforming, and the liquid level of level gauge (12) is higher than the upper limit threshold value of settlement, convert into the extrinsic cycle and handle the process flow, first motorised valve (8) are closed this moment, second motorised valve (14) are opened, it flows back to in rainwater tank (1) to strain back water, adjust according to PLC regulation and control device (16) and promote pump package (2) reduce flow, make it at quartz sand filter equipment (5) to strain back water, the filtration time extension of biological activity charcoal filter equipment (6), coagulant dosing mixing arrangement (4) are according to the turbidity detected value of on-line pollutant detection instrument cluster (7) decrement coagulant dosing quantity gradually this moment. When the organic matter index of the online pollutant detection instrument group (7) is detected to be qualified or the liquid level of the liquid level meter (12) is between the set lower limit and the upper limit threshold value again, the first electric valve (8) is opened, the second electric valve (14) is closed, the process is converted into a low-load conventional treatment process flow, and the pump group (2) is lifted to operate until the liquid level of the liquid level meter (12) of the clean water tank reaches the highest water level and then is stopped.
The present invention is further illustrated by, but not limited to, the following examples.
Example (c):
according to the regulation in the Water quality Standard for urban miscellaneous Water (GBT18920-2002), the ammonia nitrogen limit value of 20mg/L and the turbidity limit value of 10NTU for urban greening water, the ammonia nitrogen limit value of 10mg/L and the turbidity limit value of 5NTU for vehicle washing, the average turbidity removal rate of the quartz sand filtering device is 80%, 30% (coagulant addition and coagulant non-addition), the ammonia nitrogen and the average turbidity removal rate of the biological activated carbon filtering device are respectively 50% and 30%, the membrane filtering device is selected to be of a primary microfiltration type, and the effluent quality of each processing unit of the conventional process flow and the internal circulation process flow is shown in Table 1.
TABLE 1 rainwater treatment effect of different process flows
As can be seen from Table 1, the turbidity and ammonia nitrogen change conditions of the polluted rainwater with the turbidity of 60NTU and the ammonia nitrogen of 30mg/L after the polluted rainwater passes through different processes of a fine regulation and control system for purifying and recycling the rainwater of the public building of various water sources. In the regulation and control process of the public building rainwater purification and recycling fine regulation and control system for multiple water sources, the first electric valve (8) is opened firstly to treat polluted rainwater by using a conventional process flow, the turbidity of the outlet water after the treatment of the quartz sand filtering device is reduced to 12NTU, the ammonia nitrogen is reduced to 28mg/L, the turbidity of the outlet water of the biological activated carbon filtering device is 9NTU, and the ammonia nitrogen is 14mg/L, so that the water quality requirement of urban greening water can be met, but the turbidity value is very close to the limit value of 10NTU, so that the excessive risk is high, and the turbidity value of the outlet water after the purification of the membrane filtering device is 0.3NTU, and the ammonia nitrogen is 13 mg/L. Therefore, after the polluted rainwater is treated by the conventional process flow, the water quality of the outlet water completely meets the water quality requirement of urban greening water.
After rainwater is treated by the conventional process flow, the quality of outlet water cannot meet the requirement of water quality for vehicle washing, and if the water stored in the clean water tank is used for vehicle washing, an internal circulation process flow is adopted for operation. At the moment, the PLC regulating and controlling device closes the first electric valve (8), opens the third electric valve (15), the coagulant dosing and mixing device (4) stops dosing, the disinfectant dosing device (10) stops dosing the disinfectant, and the rainwater with unqualified pollutants is circularly treated by the internal circulation process flow until the ammonia nitrogen content in the online pollutant detection instrument set (7) of the effluent of the biological activated carbon filtering device is lower than 7 mg/L. At the moment, the first electric valve (8) is opened, the third electric valve (15) is closed, the conventional treatment process flow is converted, and the effluent quality passing through the membrane filtration device is 0.3NTU in turbidity and 6mg/L in ammonia nitrogen. Therefore, after the polluted rainwater passes through the internal circulation process, the effluent quality completely meets the water quality requirement of vehicle flushing.
According to the embodiment, the refined regulation and control system for purifying and recycling the public building rainwater suitable for various water source water is adopted, the treatment process flow is refined and controlled according to the types of different water source water and the change of the water quality pollution degree, the purposes of deep purification and efficient recycling of the public building rainwater and various water source water are achieved, the recycling rate of the rainwater and other unconventional water source water is improved, the application field and the industry range of recycled water are greatly widened, and the reasonable and efficient utilization of public building water resources is realized.
Claims (9)
1. The utility model provides a public building rainwater purifies and regulation and control system that becomes more meticulous of retrieval and utilization suitable for multiple water supply water which characterized in that includes:
the device comprises a rainwater storage tank, a lifting pump group, an online flow detector, an online pollutant detection instrument group, a coagulant dosing and mixing device, a quartz sand filtering device, a biological activated carbon filtering device, an electric valve, a membrane filtering device, a disinfectant dosing device, a clean water tank, a liquid level meter, a PLC (programmable logic controller) regulating and controlling device and a pipeline connected with the devices;
a rainwater storage tank (1), a lift pump set (2), an online flow detector (3), a coagulant dosing and mixing device (4), a quartz sand filtering device (5), a biological activated carbon filtering device (6), an online pollutant detection instrument set (7), a first electric valve (8), a membrane filtering device (9), a disinfectant dosing device (10) and a clean water tank (11) which are sequentially connected, wherein the clean water tank (11) is provided with a liquid level meter (12), wherein a return pipe (13) is arranged in front of the first electric valve (8), the return pipe (13) is connected with the rainwater storage tank (1) through a second electric valve (14), a branch pipeline is arranged in front of the second electric valve (14), the branch pipeline is connected with a water suction pipe in front of the lifting pump group (2) through a third electric valve (15), namely, the pipeline connection between the rainwater storage tank (1) and the lifting pump set (2) is called as a water suction pipe; the system comprises a lifting pump set (2), an online flow detector (3), a coagulant dosing mixing device (4), an online pollutant detection instrument set (7), a disinfectant dosing device (10), a liquid level meter (12), a first electric valve (8), a second electric valve (14) and a third electric valve (15), which are all connected with a PLC regulation and control device (16).
The lifting pump set (2) lifts rainwater in the rainwater storage tank (1), flows through the online flow detector (3), is added with a coagulant through the coagulant adding and mixing device (4) to be mixed with rainwater, and then is conveyed to the quartz sand filtering device (5) and the biological activated carbon filtering device (6);
under the condition of a conventional treatment process flow, when the filtered water of the biological activated carbon filtering device (6) is qualified through the detection of organic matters and turbidity indexes of the online pollutant detection instrument set (7), the first electric valve (8) is opened, and the filtered water is sequentially conveyed to the membrane filtering device (9) and the disinfectant dosing device (10) and then enters the clean water tank (11);
when the organic matter index of the online pollutant detection instrument set (7) of the filtered water is unqualified and the liquid level of the liquid level meter (12) is lower than a set lower limit threshold, switching to an internal circulation treatment process flow, closing the first electric valve (8), opening the third electric valve (15), stopping the dosing of the coagulant dosing and mixing device (4), stopping the dosing of the disinfectant by the disinfectant dosing and mixing device (10), pressurizing the filtered water again through the lifting pump set (2) through the return pipe (13), and then flowing through the online flow detector (3), the coagulant dosing and mixing device (4), the quartz sand filtering device (5) and the biological activated carbon filtering device (6) to perform internal circulation treatment process operation; when the organic matter index of the online pollutant detection instrument set (7) is detected to be qualified, the first electric valve (8) is opened, the third electric valve (15) is closed, the conventional treatment process flow is recovered, and at the moment, the coagulant dosing and mixing device (4) starts to add the medicament and the disinfectant dosing device (10) starts to add the disinfectant;
when the filtered water is unqualified in organic matter index detection of the online pollutant detection instrument set (7) and the liquid level of the liquid level meter (12) is between a set lower limit threshold and an upper limit threshold, switching to a low-load cyclic treatment process, closing the first electric valve (8), opening the third electric valve (15), stopping the chemical dosing of the coagulant dosing mixing device (4), stopping the disinfectant dosing of the disinfectant dosing mixing device (10), adjusting the flow rate of the back-filtered water of the lifting pump set (2) according to the instruction of the PLC regulating device (16), and performing slow cyclic treatment process operation through the online flow detector (3), the coagulant dosing mixing device (4), the quartz sand filtering device (5) and the biological activated carbon filtering device (6); when the organic matter index of the online pollutant detection instrument set (7) is detected to be qualified, the first electric valve (8) is opened, the third electric valve (15) is closed, the process is converted into a low-load conventional treatment process flow, filtered water flows into the clean water tank (11) after passing through the membrane filtering device (9) and the disinfectant dosing device (10), and the coagulant dosing mixing device (4) and the disinfectant dosing device (10) are both used for dosing the coagulant and the disinfectant in proper amount according to the treatment flow rate according to the instruction of the PLC regulating device (16);
when the filtered water is unqualified in organic matter index detection of the online pollutant detection instrument set (7) and the liquid level of the liquid level meter (12) is higher than a set upper limit threshold value, the process flow is converted into an external circulation treatment process, at the moment, the first electric valve (8) is closed, the second electric valve (14) is opened, the filtered water flows back to the rainwater storage tank (1), the lifting pump set (2) is adjusted to reduce the flow according to the PLC regulation and control device (16), so that the filtering time of the filtered water in the quartz sand filtering device (5) and the biological activated carbon filtering device (6) is prolonged, and at the moment, the coagulant dosing and mixing device (4) gradually reduces the coagulant dosing amount according to the turbidity detection value of the online pollutant detection instrument set (7); when the organic matter index of the online pollutant detection instrument group (7) is detected to be qualified or the liquid level of the liquid level meter (12) is between the set lower limit and the upper limit threshold value again, the first electric valve (8) is opened, the second electric valve (14) is closed, the process is converted into a low-load conventional treatment process flow, and the pump group (2) is lifted to operate until the liquid level of the liquid level meter (12) of the clean water tank reaches the highest water level and then is stopped.
2. A method according to claim 1, characterised in that the incoming water to the stormwater storage (1) is building stormwater, building greywater, municipal greywater or other non-conventional source water.
3. The method according to claim 1, characterized in that the membrane filtration device (9) is a microfiltration membrane or an ultrafiltration membrane, being a primary or secondary membrane filtration system.
4. The method as claimed in claim 1, wherein the agent added to the disinfection and drug adding device (10) is one of the disinfectants such as chlorine dioxide and hypochlorite, or is replaced by a combination of other disinfection methods.
5. The method according to claim 1, wherein the coagulant used in the coagulant dosing and mixing device (4) is one of a common coagulant such as an aluminum salt and an iron salt, and various complex coagulants.
6. The method according to claim 1, wherein the online contaminant detection instrument cluster (7) can detect 2 or more water quality indicators, and the detected contaminant indicators can be particulate indicators such as turbidity, suspended solids, and particle number, organic indicators such as UV, TOC, and COD, and nutrient indicators such as ammonia nitrogen and total phosphorus.
7. The method according to claim 1, characterized in that the flow rate of the internal circulation treatment process is the flow rate of the conventional treatment process, the flow rate of the low-load circulation treatment process and the flow rate of the low-load conventional treatment process are 1/10-1/20 of the flow rate of the conventional treatment process, and the PLC regulating device (16) regulates the lift pump group (2) to realize the flow rate control.
8. The method as claimed in claim 1, wherein the upper and lower thresholds for the liquid level of the liquid level meter (12) are set to 60% -70% and 30% -40% of the maximum design level of the clean water tank (11), respectively.
9. A method according to claim 1, characterized in that the clean water reservoir (11) outlet water is used for recirculating cooling water replenishing of public building areas, landscape water, greening, road cleaning, fire fighting, vehicle cleaning, ground flushing, toilet flushing, construction.
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