CN110937657B - Concentrated water recycling system for dual water supply of public building and zero-emission fine regulation and control method - Google Patents
Concentrated water recycling system for dual water supply of public building and zero-emission fine regulation and control method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004064 recycling Methods 0.000 title claims abstract description 22
- 230000009977 dual effect Effects 0.000 title claims abstract description 20
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 53
- 231100000719 pollutant Toxicity 0.000 claims abstract description 53
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 239000003651 drinking water Substances 0.000 claims abstract description 23
- 235000020188 drinking water Nutrition 0.000 claims abstract description 22
- 239000012528 membrane Substances 0.000 claims abstract description 17
- 238000000746 purification Methods 0.000 claims abstract description 13
- 238000005374 membrane filtration Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000001223 reverse osmosis Methods 0.000 claims description 10
- 238000001728 nano-filtration Methods 0.000 claims description 8
- 239000000356 contaminant Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000005342 ion exchange Methods 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 230000033116 oxidation-reduction process Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 235000012206 bottled water Nutrition 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 4
- 125000004122 cyclic group Chemical group 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/02—Public or like main pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/072—Arrangement of flowmeters
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/074—Arrangement of water treatment devices
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/02—Plumbing installations for fresh water
- E03C1/021—Devices for positioning or connecting of water supply lines
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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Abstract
A concentrated water recycling system for dual water supply of public buildings and a zero-emission fine regulation and control method belong to the technical field of water saving of building water. The device comprises a building water supply main pipe, a dual water supply inlet pipe, a booster pump, a membrane filter device, a concentrated water storage device, an electromagnetic valve, a liquid level meter, a purification device, an online pollutant detection instrument group, a PLC regulation and control device and the like. When the membrane filtration device stops operating, the PLC regulating and controlling device collects and calculates the content and change rule of pollutants in the building water main; when the membrane filtration device is operated, concentrated water is generated, the PLC regulating and controlling device regulates and controls a concentrated water pressure pump and an electromagnetic valve, the concentrated water is mixed into a building water supply main pipe for recycling in a direct mixing or after-purification mixing mode, the quality of the mixed water is monitored in real time by adopting an online pollutant detecting instrument set, the condition that the quality of the mixed water meets the sanitary standard for drinking water (GB5749-2006) is ensured, the concentrated water generated by quality-based water supply is completely recycled, and the purposes of low-cost cyclic utilization of water resources and high-efficiency water saving are achieved.
Description
Technical Field
The invention belongs to the technical field of water conservation for buildings, and particularly relates to a concentrated water recycling system for dual water supply of public buildings and a zero-emission fine regulation and control method.
Background
The public building has the characteristics of various types, complex functions, huge volume and high water consumption, and is an important node of the urban living water supply and utilization system. Different users and water consumption units in some kinds of public buildings have obvious difference in water quality and water quantity requirements, and different water quality requirements are often met by adopting a dual water supply system, for example, hospitals, medical institutions and the like have different requirements on dual water supply.
The purification process of the present stage dual water supply system mainly adopts membrane filtration technology, including nanofiltration technology and reverse osmosis technology. The common quality-divided water supply purification unit mainly comprises a first-stage reverse osmosis (nanofiltration) process and a second-stage reverse osmosis (nanofiltration), wherein the water yield of pure water of the first-stage reverse osmosis (nanofiltration) process is about 50%, the water yield of pure water of the second-stage reverse osmosis (nanofiltration) process is generally 75-80%, and a large amount of generated concentrated water is directly discharged, so that the serious waste of water resources is caused. The serious problem of water resource shortage exists in many areas of China, and how to effectively regenerate and reuse membrane filtration concentrated water is always a hot point of attention in the industry.
Municipal tap water is generally used as inlet water in a quality-divided water supply system of public buildings, the water quality index of the tap water meets the sanitary standard for drinking water quality (GB5749-2006), and the pollutant content in water is generally low; the content of pollutants in the concentrated water generated by the primary and secondary reverse osmosis (nanofiltration) processes of the quality-divided water supply system is only increased by about 1-2 times compared with that of the inlet water, the content of pollutants in the concentrated water is not high, and if the water quality indexes do not exceed the standards of sanitary Standard for Drinking Water (GB5749-2006), the concentrated water can be directly reused in the water supply system; if the individual water quality index exceeds the standard to a small extent and can still meet the water quality standard of drinking water after being refluxed to the original water supply pipeline for mixing and diluting, the concentrated water can also be directly recycled into a water supply system; if the individual water quality index exceeds the standard to a large extent, the concentrated water can be purified and then recycled to a water supply system.
Under the background, based on meeting sanitary standards for drinking water (GB5749-2006), a concentrated water recycling system for quality-divided water supply of public buildings and a zero-emission fine regulation and control method are provided, and the concentrated water recycling of the quality-divided water supply system of the public buildings is subjected to fine regulation and control, so that the concentrated water is recycled by 100%, and the zero emission of the concentrated water is realized.
Disclosure of Invention
The invention aims to solve the problem of recycling concentrated water generated by a quality-divided water supply system, and provides a concentrated water recycling system for quality-divided water supply of a public building and a zero-emission fine regulation and control method, so as to meet the requirements of different users on different water qualities and water quantities, realize 100% recycling of concentrated water of the quality-divided water supply system, and achieve the purpose of zero emission of concentrated water.
In order to achieve the purpose, the invention adopts the following technical scheme: a concentrated water recycling system for dual water supply of public buildings and a zero-emission fine regulation and control method are characterized by comprising the following steps:
the device comprises a building water supply main pipe, a dual water supply inlet pipe, a booster pump, a membrane filter device, a concentrated water storage device, an electromagnetic valve, a liquid level meter, a purification device, an online pollutant detection instrument group, a PLC regulation and control device, a water pipe connected with the devices and the like;
the system is characterized in that a dual water supply inlet pipe (2) is arranged on a building water supply main pipe (1), a booster pump (3) and a membrane filter device (4) are sequentially arranged on the dual water supply inlet pipe (2), a water production pipe (5) of the membrane filter device (4) is connected with a pure water pipe (6), a concentrated water pipe (7) of the membrane filter device (4) is connected with a concentrated water storage device (8), a liquid level meter (9) is arranged in the concentrated water storage device (8), the outlet water of the concentrated water storage device is respectively connected with a first concentrated water pressure pump (10) and a second concentrated water pressure pump (13), the first concentrated water pressure pump (10) and the second concentrated water pressure pump (13) are connected in parallel, wherein the first concentrated water pressure pump (10) is connected with a non-drinking water pipeline (12) through a first electromagnetic valve (11), the water outlet of the second concentrated water pressure pump (13) is respectively connected with a second electromagnetic valve (14) and a third electromagnetic valve (15), the second electromagnetic valve (14) and the third electromagnetic valve (15) are connected in parallel, wherein the second electromagnetic valve (14) is connected with the rear end of the building water supply main pipe (1), and the third electromagnetic valve (15) is connected with a purification device (16) in sequence and then connected with the rear end of the building water supply main pipe (1); the online pollutant detection instrument group (17) is arranged on a rear end pipe section of a connection point of the purification device (16) and the building water supply main pipe (1). The detection and control signals of the booster pump (3), the first concentrated water booster pump (10), the second concentrated water booster pump (13), the liquid level meter (9), the first electromagnetic valve (11), the second electromagnetic valve (14), the third electromagnetic valve (15) and the online pollutant detection instrument set (17) are all transmitted to the PLC regulation and control device (18). The membrane filtration device (4) can be a nanofiltration or reverse osmosis device and can be a primary or secondary filtration system. The purification device (16) can be an advanced oxidation, activated carbon adsorption, ion exchange device or the like or a combination system of the devices. The non-drinking water pipeline (12) can be a reclaimed water pipeline, a miscellaneous water pipeline and the like.
The online pollutant detection instrument set (17) can detect one or more water quality indexes, and the detected pollutant types can be indexes with definite limits in turbidity, particle number, chroma, conductivity, hardness, total dissolved solids, chemical oxygen demand, oxidation-reduction potential and the like and sanitary Standard for Drinking Water (GB 5749-2006). When detecting and controlling a plurality of water quality indexes, the water quality index which reaches the set value at first is used as a control point for switching the second electromagnetic valve (14) to the third electromagnetic valve (15).
When the membrane filter device (4) stops running, no concentrated water is generated, the online pollutant detection instrument set (17) detects and counts the pollutant content in the building water supply main pipe (1), and the pollutant change rule is analyzed according to the statistical program programmed in the PLC regulation and control device (18); when the membrane filter device (4) operates to produce water, concentrated water is generated, the first concentrated water pressure pump (10) is started, the first electromagnetic valve (11) is opened, and the PLC regulating and controlling device (18) regulates and controls the flow of the first concentrated water pressure pump (10) according to the water demand of the non-drinking water pipeline (12); when the water demand of the non-drinking water pipeline (12) is small, so that a liquid level meter (9) in the concentrated water storage device (8) is increased to a full level, a second concentrated water pressurizing pump (13) is started, and a second electromagnetic valve (14) is opened, so that the concentrated water flows back into the building water supply main pipe (1) and is mixed with the building water supply; the online pollutant detection instrument group (17) detects the pollutant content in the building water supply main pipe (1), compares the pollutant content with a limit value set in the PLC regulation and control device (18), and regulates and controls the flow of the second concentrated water pressure pump (13) to enable the pollutant content in the building water supply main pipe (1) to be lower than the limit value; when the online pollutant detection instrument group (17) detects that the pollutant content in the building water supply main pipe (1) reaches the limit value set by the PLC regulation and control device (18), the second electromagnetic valve (14) is closed, the third electromagnetic valve (15) is opened, concentrated water is purified by the purifying device (16) and then flows back to the rear end of the building water supply main pipe (1) to be mixed with building water, and then the pollutant content in the building water supply main pipe (1) is lower than the limit value through the online pollutant detection instrument group (17).
The invention has the following advantages:
(1) the invention realizes the complete reuse of the concentrated water generated by the quality-divided water supply system and realizes the zero discharge of the concentrated water.
(2) The quality of mixed water after the concentrated water and the supplied water are mixed still accords with sanitary Standard for Drinking Water (GB5749-2006), the utilization rate of the concentrated water is obviously improved, and the purposes of low-cost cyclic utilization of water resources and high-efficiency water saving are realized.
(3) Adopt water supply pipe system's water quality monitoring and control mode, switch and real-time water quality monitoring has realized the regulation and control that becomes more meticulous of dense water retrieval and utilization through dense water pipe system.
Description of the drawings:
FIG. 1 is a schematic diagram of the general structure of the present invention;
in the figure, (1) -a building water supply main pipe, (2) -a quality-divided water supply inlet pipe, (3) -a booster pump, (4) -a membrane filter device, (5) -a water production pipe, (6) -a pure water pipe, (7) -a concentrated water pipe, (8) -a concentrated water storage device, (9) -a liquid level meter, (10) -a first concentrated water pressurizing pump, (13) -a second concentrated water pressurizing pump, (11) -a first electromagnetic valve, (12) -a non-drinking water pipe, (14) -a second electromagnetic valve, (15) -a third electromagnetic valve, (16) -a purification device, (17) -an online pollutant detection instrument set and (18) -a PLC regulation and control device.
The specific implementation method comprises the following steps:
referring to fig. 1, the invention comprises a building water supply main pipe, a dual water supply inlet pipe, a booster pump, a membrane filter device, a concentrated water storage device, a pure water pipe, a concentrated water pipe, a liquid level meter, a concentrated water booster pump, an electromagnetic valve, a non-drinking water pipe, a purification device, an online pollutant detection instrument set, a PLC regulation and control device 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, when the membrane filter device (4) stops operating, no concentrated water is generated, the online pollutant detection instrument group (17) can detect and count the pollutant content in the building water main pipe (1), and the pollutant change rule is calculated according to the statistical program programmed in the PLC regulation and control device (18).
When the membrane filter device (4) operates to produce water, concentrated water is generated, the first concentrated water pressure pump (10) is started, the first electromagnetic valve (11) is opened, and the PLC regulating and controlling device (18) regulates and controls the flow of the concentrated water pressure pump (10) according to the water demand of the non-drinking water pipeline (12); when the water demand of the non-drinking water pipeline (12) is small, so that a liquid level meter (9) in the concentrated water storage device (8) is increased to a full level, a second concentrated water pressurizing pump (13) is started, and a second electromagnetic valve (14) is opened, so that the concentrated water flows back into the building water supply main pipe (1) and is mixed with the building water supply; the online pollutant detection instrument group (17) detects the pollutant content in the building water supply main pipe (1), compares the pollutant content with a limit value set in the PLC regulation and control device (18), and regulates and controls the flow of the second concentrated water pressurizing pump (13) to enable the pollutant content in the building water supply main pipe (1) to be lower than the limit value.
When the online pollutant detection instrument group (17) detects that the pollutant content in the building water supply main pipe (1) reaches the limit value set by the PLC regulation and control device (18), the second electromagnetic valve (14) is closed, the third electromagnetic valve (15) is opened, the concentrated water is purified by the purifying device (16) and then flows back to the rear end of the building water supply main pipe (1) to be mixed with the building water supply, and then the pollutant content in the building water supply main pipe (1) is detected by the online pollutant detection instrument group (17).
The present invention is further illustrated by, but not limited to, the following examples.
Example (c):
according to the regulation in sanitary Standard for Drinking Water (GB5749-2006), the oxygen Consumption (COD) is determined by permanganateMn) The limiting value of 3mg/L is taken as an example, the membrane filtration system is a two-stage reverse osmosis device, the water yield is 75 percent, the concentration multiple is 4, the operation mode of the membrane filtration system is that concentrated water is directly refluxed and mixed with building water supply, and the specific parameters are shown in Table 1.
TABLE 1 Dual Water supply System operating parameters for Single contaminants
Example table 1 shows the results of a dual water supply system operating with a single contaminant monitored under 2 water quality conditions. It can be seen that when the membrane filtration device does not produce water, the on-line pollutant detection instrument set can detect COD in the building water supply main pipe (1)MnContent, PLC regulation and control device collects and calculates CODMnThe average values are respectively 1.0 and 2.0mg/L, which are both obviously lower than the set CODMnThe limit value is 3.0 mg/L.
Adopt public building to divide the qualityWhen the concentrated water recycling system for water supply and the zero-emission fine regulation and control method are used, under the most unfavorable condition that the water consumption of non-drinking water is zero, according to the pure water yield of 450 and 330L/s and the water yield of 75%, the inflow rate of the quality-divided water supply and the flow rate of the rear end of the building water supply main pipe can be calculated to be 600L/s, 440L/s, 400L/s and 560L/s respectively, the mixed water flow rate of the mixed concentrated water and the rear end of the building water supply main pipe is 550 and 670L/s respectively, and the COD (chemical oxygen demand) of the mixed water is 550 and 670L/s respectivelyMnThe average concentration values are respectively 1.82 and 2.98mg/L, which are both lower than the set CODMnThe limit value is 3.0mg/L, and the full recycling of the concentrated water is realized.
When the water supply COD of the buildingMnWhen the content is 2.0mg/L, the COD is generated after the 110L/s concentrated water is mixed with the building water main pipeMnThe content is close to the limit value of 3.0mg/L, and in order to prevent the phenomenon that pollutants exceed the standard caused by water quality fluctuation, the maximum reuse amount of concentrated water can be set to be 100L/s; if more concentrated water is needed for recycling, the second electromagnetic valve (14) can be closed, and the third electromagnetic valve (15) can be opened, so that all the concentrated water is recycled after being purified.
Table 2 of the example also shows the results of a dual water supply system operating with two pollutants monitored for 2 water quality conditions. According to the regulation in sanitary Standard for Drinking Water (GB5749-2006), COD is usedMnFor example, the limit of 3.0mg/L and the limit of total hardness of 450mg/L, the membrane filtration system is a two-stage reverse osmosis device, the water yield is 75 percent, the concentration multiple is 4, the operation mode of the membrane filtration system is that concentrated water is directly refluxed and mixed with building water supply, and the specific parameters are shown in Table 2.
TABLE 2 Dual Water supply System operating parameters for two contaminants
As can be seen from Table 2, when the membrane filtration device does not produce water, the on-line pollutant detecting instrument set can detect COD in the building water supply main pipe (1)MnAnd the total hardness content, and the COD is acquired and calculated by a PLC regulating and controlling deviceMnAnd the average values of the total hardness are respectively 1.5, 2.5mg/L and 250, 350mg/L which are all obviously lower than the set CODMnA limit of 3.0mg/L and a total hardness limit of 450 mg/L.
When the concentrated water recycling system for the quality-divided water supply of the public building and the zero-emission fine regulation and control method are adopted, under the most unfavorable condition that the water consumption of non-drinking water is zero, according to the pure water yield of 442.5 and 157.5L/s and the water yield of 75%, the water inlet flow of the quality-divided water supply and the flow of the rear end of the building water supply main pipe are respectively 590 and 210L/s, 410 and 790L/s, the mixed water flow of the generated concentrated water and the rear end of the building water supply main pipe after mixing is respectively 557.5 and 842.5L/s, and COD (chemical oxygen demand) is respectivelyMnAnd the average values of the total hardness are respectively 2.69, 2.97mg/L, 448 and 415mg/L which are all lower than the set CODMnAnd the total hardness limit value, and the full recycling of the concentrated water can be realized.
COD for water supply in buildingMnAnd under the condition that the average total hardness content is 1.5 and 250mg/L respectively, when 147.5L/s of concentrated water is completely recycled, the total hardness content of the mixed water is 448mg/L and is firstly close to and reaches a set limit value, in order to prevent the phenomenon that the total hardness exceeds the standard caused by water quality fluctuation, the maximum recycling amount of the concentrated water can be set to be 140L/s, and if more water quantities of the concentrated water need to be recycled, the second electromagnetic valve (14) can be closed, and the third electromagnetic valve (15) can be opened, so that the all concentrated water is recycled after being purified.
COD for water supply in buildingMnAnd the average total hardness content is 2.5 and 350mg/L respectively, when the concentrated water of 52.5L/s is completely reused, the COD of the mixed waterMnThe average content is 2.97mg/L, which is close to and reaches the set limit value firstly, in order to prevent COD caused by water quality fluctuationMnAnd (3) the phenomenon of exceeding standard can be set as 50L/s, if more concentrated water needs to be recycled, the second electromagnetic valve (14) can be closed, and the third electromagnetic valve (15) can be opened, so that all the concentrated water is recycled after being purified.
The examples of different types of pollutants show that after the concentrated water recycling system for the quality-divided water supply of the public building and the zero-emission fine regulation and control method are adopted, the concentrated water zero-emission recycling system is established through fine regulation and control of the concentrated water recycling process of the quality-divided water supply system of the public building, so that all the concentrated water generated by the membrane filter device is recycled, the recycling rate of the concentrated water is obviously improved, and the purposes of low-cost cyclic utilization of water resources and high-efficiency water saving are achieved.
Claims (6)
1. A zero-emission fine control method of a concentrated water recycling system for the dual water supply of a public building is characterized in that a building water supply main pipe (1) is provided with a shunted dual water supply inlet pipe (2), the dual water supply inlet pipe (2) is sequentially provided with a booster pump (3) and a membrane filter device (4), a water production pipe (5) of the membrane filter device (4) is connected with a pure water pipe (6), a concentrated water pipe (7) of the membrane filter device (4) is connected with a concentrated water storage device (8), a liquid level meter (9) is arranged in the concentrated water storage device (8) and is connected with a first concentrated water pressure pump (10) and a second concentrated water pressure pump (13), the first concentrated water pressure pump (10) is connected with a first electromagnetic valve (11) and a non-drinking water pipe (12), the second concentrated water pressure pump (13) is connected with a second electromagnetic valve (14) and a third electromagnetic valve (15), the second electromagnetic valve (14) is connected with the third electromagnetic valve (15) in parallel, wherein the second electromagnetic valve (14) is connected with the rear end of the building water supply main pipe (1), and the third electromagnetic valve (15) is connected with the purification device (16) in sequence and then is connected with the rear end of the building water supply main pipe (1); the online pollutant detection instrument group (17) is arranged on a rear end pipe section of a connection point of the purification device (16) and the building water supply main pipe (1); detection and control signals of a booster pump (3), a first concentrated water pressure pump (10), a second concentrated water pressure pump (13), a liquid level meter (9), a first electromagnetic valve (11), a second electromagnetic valve (14), a third electromagnetic valve (15) and an online pollutant detection instrument set (17) are all transmitted to a PLC regulation and control device (18);
when the membrane filter device (4) stops running, no concentrated water is generated, the online pollutant detection instrument set (17) detects and counts the pollutant content in the building water supply main pipe (1), and the pollutant change rule is analyzed according to the statistical program programmed in the PLC regulation and control device (18); when the membrane filter device (4) operates to produce water, concentrated water is generated, the first concentrated water pressure pump (10) is started, the first electromagnetic valve (11) is opened, and the PLC regulating and controlling device (18) regulates and controls the flow of the first concentrated water pressure pump (10) according to the water demand of the non-drinking water pipeline (12); when the water demand of the non-drinking water pipeline (12) is small, so that a liquid level meter (9) in the concentrated water storage device (8) is increased to a full level, a second concentrated water pressurizing pump (13) is started, and a second electromagnetic valve (14) is opened, so that the concentrated water flows back into the building water supply main pipe (1) and is mixed with the building water supply; the online pollutant detection instrument group (17) detects the pollutant content of the mixed water in the building water supply main pipe (1), compares the pollutant content with a limit value set in the PLC regulation and control device (18), and regulates and controls the flow of the second concentrated water pressure pump (13) to enable the pollutant content of the mixed water in the building water supply main pipe (1) to be lower than the limit value; when the online pollutant detection instrument group (17) detects that the pollutant content of the mixed water in the building water supply main pipe (1) reaches the limit value set by the PLC regulation and control device (18), the second electromagnetic valve (14) is closed, the third electromagnetic valve (15) is opened, the concentrated water is purified by the purifying device (16) and then flows back to the rear end of the building water supply main pipe (1) to be mixed with the building water supply, and then the online pollutant detection instrument group (17) detects the pollutant content of the mixed water in the building water supply main pipe (1) to be lower than the limit value.
2. The method according to claim 1, characterized in that the membrane filtration device (4) is a nanofiltration or reverse osmosis device, being a primary or secondary filtration system.
3. The method according to claim 1, wherein the purification device (16) is one or more of an advanced oxidation device, an activated carbon adsorption device and an ion exchange device.
4. The method of claim 1, wherein the on-line contaminant detection instrument cluster (17) detects one or more water quality indicators, and the detected contaminant species are one or more of turbidity, particle count, color, conductivity, hardness, total dissolved solids, chemical oxygen demand, and oxidation-reduction potential.
5. A method according to claim 1, characterized in that when detecting and controlling a plurality of water quality indicators, the water quality indicator which reaches the set value first is taken as the control point for switching the second solenoid valve (14) to the third solenoid valve (15).
6. Method according to claim 1, characterized in that the non-potable water conduit (12) is a medium water conduit or a service water conduit.
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