Reclaimed water reuse treatment system

Abstract

The utility model discloses a reclaimed water reuse treatment system, which belongs to the technical field of wastewater treatment and comprises a sand filter device, a multi-stage filter blowdown device, a Y-shaped filter, an ultrafiltration device, an ultrafiltration water producing tank, a safety filter and a reverse osmosis device which are sequentially arranged according to a reclaimed water treatment process, the sand filtration device receives raw water inlet, sand filtration outlet water produced by the sand filtration device sequentially enters the multi-stage filtration backflushing blowdown device, the Y-shaped filter and the ultrafiltration device, water produced by the ultrafiltration device enters the ultrafiltration water producing pool to be stored, the ultrafiltration water producing pool flows through the safety filter and then enters the reverse osmosis device, the reverse osmosis water producing water is conveyed to the recycling water tank, and the recycling water tank is used for recycling the water produced by the reverse osmosis device. And the reverse osmosis concentrated water is conveyed to a concentrated water tank. According to the utility model, the problems of filter screen breakdown of the Y-shaped filter at the rear end and blockage of an ultrafiltration system caused by sand leakage in the existing reclaimed water recycling system are solved, the stability and the reliability of system operation are improved, and the production interruption and the cost increase caused by frequent shutdown for replacing the filter screen are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a greywater reuse treatment system. Background Technology

[0002] Raw water is treated by ultrafiltration and reverse osmosis through a sand filtration system to produce qualified recycled water. The recycled water can be used to make up for the circulating water tower in the plant area. However, the current raw water treatment system has the following problems: (1) As a key link in the front-end pretreatment, the sand filtration system often leaks sand due to design defects, improper operation or equipment aging. The sand leakage of the sand filtration system not only directly contaminates the downstream Y-type filter, causing the filter screen to break down, but also further clogs the ultrafiltration system, causing the water flux to drop rapidly. This forces the system to frequently stop and replace the filter screen, which seriously affects the production efficiency and system stability. In addition, the sand filtration system has been running for a long time over the years, and the sand particle size has become smaller, resulting in a certain degree of sand leakage. This sand leakage flows under high pressure, which has caused the surface of the ultrafiltration Y-type filter to be broken down and the filter screen to be clogged, resulting in a shorter operating cycle of the ultrafiltration device and an increased rate of flux decline. (2) The ultrafiltration unit has only one Y-type filter (size: length 310mm, inner diameter 170mm, pore size 5mm, precision 50um) at the front end to act as a protective device. Because the sand filter has been used for a long time, the gravel at the bottom layer inside has been washed over the years and has become finer sand. This fine sand enters the water inlet pipe of the ultrafiltration system along the high-pressure water flow and is intercepted by the Y-type filter. This means that the Y-type filter not only has to intercept suspended impurities in the raw water, but also has to filter the sand in the sand filter. This greatly increases the operating load of the Y-type filter. The flow rate of the Y-type filter drops too quickly, which requires the team to frequently stop the machine to replace the Y-type filter. It takes about 25 minutes to replace one set of Y-type filters and 75 minutes to replace three sets. The frequent shutdown of the greywater system to replace the Y-type filter not only increases the workload of the team, making the already short-staffed team even busier, but also reduces the daily operating time of the greywater system and reduces the greywater return production. Utility Model Content

[0003] Technical Problem Solved: Addressing the problems existing in the operation of greywater treatment systems in the background art, this utility model provides a greywater reuse treatment system that effectively solves the problems of filter screen rupture in the downstream Y-type filter and clogging of the ultrafiltration system caused by sand leakage in existing greywater reuse systems. This improves the stability and reliability of system operation, reduces production interruptions and cost increases caused by frequent filter screen replacements, improves effluent quality, ensures the normal operation of the downstream ultrafiltration and reverse osmosis systems, and increases greywater reuse efficiency. It also reduces maintenance and operating costs, improving the system's economic and environmental benefits.

[0004] Technical solution: The present invention provides a greywater reuse treatment system, which includes a sand filter, a multi-stage filtration and sewage discharge device, a Y-type filter, an ultrafiltration device, an ultrafiltration product water tank, a safety filter, and a reverse osmosis device arranged in sequence according to the greywater treatment process.

[0005] The sand filtration device accepts the effluent from the biological treatment tank and the clean wastewater as raw water inlet, and the sand filtration effluent produced by it sequentially enters the multi-stage filtration backwash and sewage discharge device, the Y-type filter and the ultrafiltration device. The water produced by the ultrafiltration device enters the ultrafiltration permeate tank for storage. The ultrafiltration permeate flows through the safety filter and then enters the reverse osmosis device. The reverse osmosis permeate is transported to the recycled water tank and then returned to the soda ash and salt production circulating water for reuse via the reuse booster pump. The reverse osmosis concentrate is transported to the concentrate tank.

[0006] Preferably, the sand filter device is equipped with a sand filter backwash air inlet pipe, a sand filter backwash water inlet pipe and a sand filter backwash drainage pipe, and the sand filter backwash water inlet pipe is connected to at least one backwash water pump.

[0007] Preferably, the multi-stage filtration and sewage discharge device includes a first multi-stage filtration and sewage discharge device and a second multi-stage filtration and sewage discharge device connected in parallel to the system, and both the first multi-stage filtration and sewage discharge device and the second multi-stage filtration and sewage discharge device include a three-stage layered filtration layer.

[0008] Each stage of the multi-stage filtration and sewage discharge device is equipped with a sewage backwash inlet pipe and a sewage backwash outlet pipe, and each sewage backwash inlet pipe and sewage backwash outlet pipe is connected to the incoming water source and the sewage source, respectively.

[0009] Preferably, the sand filtration device includes six quartz sand filters with a diameter of 3200 mm, and the effluent flow rate of each quartz sand filter is 67 m³ / s. 3 / h, with one set of ultrafiltration and reverse osmosis devices corresponding to every two quartz sand filters;

[0010] Each ultrafiltration unit has a water flow rate of 121 m³ / h. 3 / h, ultrafiltration permeate recovery rate ≥92.3%;

[0011] Each reverse osmosis unit produces 84m³ of water. 3 / h, total water production flow rate 252m³ 3 / h, reverse osmosis permeate recovery rate ≥70%.

[0012] Preferably, the backwash water pump includes two units, one for standby and one for operation, each with a backwash water pump output of 160 m³ / h. 3 / h, with a head of 0.22MPa.

[0013] Preferably, the greywater reuse treatment system includes three Y-type filters, each serving as a security filter for one of the three ultrafiltration units. The Y-type filters have a pore size of 50 μm and an output of 180-200 m³ / h. 3 / h.

[0014] Preferably, the ultrafiltration membrane of the ultrafiltration device has a pore size of 0.002~0.05μm and the ultrafiltration membrane retains pollutants with a molecular weight of 1,000~500,000 Daltons.

[0015] Preferably, the output of a single reverse osmosis unit is 84m³. 3 / h; Each reverse osmosis unit is equipped with 132 BW30FR-400 / 34 membrane modules, with each module having an effective membrane area of ​​37m². 2 The membrane modules are installed in 22 six-core FRP pressure vessels, arranged in a 15×7 configuration.

[0016] Preferably, each reverse osmosis unit is equipped with a pipeline booster pump and a safety filter, wherein the safety filter is a main pipe.

[0017] Preferably, the reverse osmosis unit is equipped with a reverse osmosis cleaning system, which provides chemical cleaning to the reverse osmosis unit every 2 months.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This utility model treatment system can effectively solve the problems of filter screen breakdown of the downstream Y-type filter and blockage of the ultrafiltration device caused by sand leakage in the existing greywater reuse system, improve the stability and reliability of system operation, and reduce production interruptions and cost increases caused by frequent shutdowns to replace filter screens; this treatment system can improve the quality of effluent, ensure the normal operation of the downstream ultrafiltration device and reverse osmosis device, and improve the greywater reuse efficiency; this treatment system can reduce maintenance and operating costs, and improve the economic and environmental benefits of the treatment system.

[0020] 2. This sand filter device is equipped with a sand filter backwashing system, which can perform backwashing operations periodically as needed, thereby improving the filtration effect of the sand filter device, reducing sand loss and leakage, and meeting the quality requirements of ultrafiltration water.

[0021] 3. This multi-stage filtration and sewage discharge device can pre-filter the ultrafiltration influent entering the Y-type filter, and the multi-stage filtration and sewage discharge device performs periodic backwashing operations, thereby reducing sand loss in the sand filter, thus improving the service life of the Y-type filter and reducing its replacement frequency. The replacement frequency of the Y-type filter is extended from 2-3 days to 30-40 days; the water quality of the sand filter effluent is much higher than the water quality requirements of the ultrafiltration influent.

[0022] This invention also has other beneficial effects, which are described in the embodiments section of the specification and will not be repeated here. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the wastewater reuse treatment system of this utility model;

[0024] Figure 2 This is a line graph showing the change in ultrafiltration effluent flow rate over time in an existing greywater reuse system.

[0025] Reference numerals in the attached diagram: 1. Sand filter device; 2. First multi-stage filtration wastewater discharge device; 3. Second multi-stage filtration wastewater discharge device; 4. Y-type filter; 5. Ultrafiltration device; 6. Ultrafiltration permeate tank; 7. Safety filter; 8. Pipeline booster pump; 9. Reverse osmosis device; 10. Raw water inlet; 11. Sand filter backwash air inlet pipe; 12. Sand filter backwash water inlet pipe; 13. Sand filter backwash drain pipe; 14. Sand filter effluent; 15. Wastewater backwash water inlet pipe; 16. Wastewater backwash drain pipe; 17. Ultrafiltration permeate; 18. Reverse osmosis permeate; 19. Concentrate tank. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-2 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0027] like Figure 1As shown, this utility model discloses a greywater reuse treatment system, which includes a sand filter device 1, a multi-stage filtration and sewage discharge device, a Y-type filter 4, an ultrafiltration device 5, an ultrafiltration permeate tank 6, a safety filter 7, and a reverse osmosis device 9 arranged sequentially according to the greywater treatment process. The sand filter device 1 receives the effluent from the biological treatment tank and the clean wastewater as raw water inlet 10, and the sand filter effluent 14 produced by it sequentially enters the multi-stage filtration and backwash sewage discharge device, the Y-type filter 4, and the ultrafiltration device 5. The permeate water from the ultrafiltration device 5 enters the ultrafiltration permeate tank 6 for storage. The ultrafiltration permeate water 17 flows through the safety filter 7 and then enters the reverse osmosis device 9. The reverse osmosis permeate water 18 is transported to the reuse water tank, and then returned to the soda ash and salt production circulating water reuse via a reuse booster pump. The reverse osmosis concentrate is transported to the concentrate tank 19. The reverse osmosis device 9 produces concentrate, which is then sent to the concentrate tank 19. If the concentrate meets the quality standards, it is discharged to the effluent monitoring tank and finally to the municipal water supply; otherwise, it is discharged to the new equalization tank. This wastewater reuse system employs quartz sand filtration, ultrafiltration, and reverse osmosis processes to reduce fine suspended solids, colloid content, and SDI value. The reverse osmosis unit 9 is the core process of the system, performing pre-desalination to remove most of the dissolved salts in the water, thus desalinating and removing hardness to meet the requirements of the circulating water makeup water. The quartz sand filter is one of the main pretreatment devices in the raw water treatment system. Its function is to filter out some fine particles, suspended solids, colloids, organic matter, and other impurities that were not removed from the clarifier water. Its filtration mechanism utilizes the fine sand in the filter to improve the water quality of the ultrafiltration influent, thereby effectively extending the service life of the subsequent ultrafiltration stage. This greywater treatment system can effectively solve the problems of sand leakage in existing greywater reuse systems, which cause filter screen breakdown of the downstream Y-type filter 4 and blockage of the ultrafiltration device 5. It improves the stability and reliability of system operation and reduces production interruptions and cost increases caused by frequent shutdowns to replace filter screens. This treatment system can improve the quality of effluent, ensure the normal operation of the downstream ultrafiltration device 5 and reverse osmosis device 9, and improve greywater reuse efficiency. This treatment system can reduce maintenance and operating costs and improve the economic and environmental benefits of the treatment system.

[0028] The sand filtration device 1 in the greywater treatment system of this utility model includes six quartz sand filters with a diameter of 3200mm, and the sand filtration outlet flow rate of each quartz sand filter is 67m³ / h. 3 / h, every two quartz sand filters correspond to one ultrafiltration unit 5 and one reverse osmosis unit 9; the water production flow rate of each ultrafiltration unit 5 is 121m³ / h. 3 / h, ultrafiltration permeate recovery rate ≥92.3%; each reverse osmosis unit produces 84m³ of permeate. 3 / h, total water production flow rate 252m³ 3 / h, reverse osmosis permeate recovery rate ≥70%.

[0029] like Figure 1As shown, the sand filter device 1 is equipped with a sand filter backwash air inlet pipe 11, a sand filter backwash water inlet pipe 12, and a sand filter backwash drain pipe 13. The sand filter backwash water inlet pipe 12 is connected to at least one backwash water pump. In a preferred embodiment, the backwash water pumps include two units, one for standby and one for operation, each with a backwash water pump output of 160 m³ / h. 3 / h, with a head of 0.22MPa. The specific backwashing steps for sand filter unit 1 are as follows:

[0030] Step 1: Use raw water as backwash water to perform preliminary backwashing on sand filter device 1. Compressed air and backwash water enter sand filter device 1 through sand filter backwash air inlet pipe 11 and sand filter backwash water inlet pipe 12 respectively for air-water mixing and cleaning, which vibrates off the pollutants attached to the surface of the filter media and discharges them through sand filter backwash drain pipe 13.

[0031] Step 2: Then, a large flow of backwash water is used for a second cleaning through the sand filter backwash water inlet pipe 12, so that the pollutants trapped on the surface of the filter media are thoroughly backwashed and discharged from the sand filter device 1.

[0032] Step 3: After backwashing is completed, perform forward washing on sand filter device 1 to form a filter membrane on the surface of the filter layer of sand filter device 1, and then accept the instruction to start filtration operation;

[0033] Step 4: When any sand filter device 1 reaches the set value in the set operating time or the accumulated flow rate, it shall be taken out of use for backwashing, while the other sand filter devices 1 continue to operate and meet the ultrafiltration water consumption requirements.

[0034] like Figure 1 As shown, the multi-stage filtration and sewage discharge device includes a first multi-stage filtration and sewage discharge device 2 and a second multi-stage filtration and sewage discharge device 3 connected in parallel to the system. Both the first multi-stage filtration and sewage discharge device 2 and the second multi-stage filtration and sewage discharge device 3 include three-level filtration layers. Each filtration layer of the multi-stage filtration and sewage discharge device is equipped with a sewage backwash inlet pipe 15 and a sewage backwash outlet pipe 16, and each sewage backwash inlet pipe 15 and sewage backwash outlet pipe 16 is connected to the incoming water source and the sewage source, respectively. The first multi-stage filtration and sewage discharge device 2 and the second multi-stage filtration and sewage discharge device 3 are alternately operated, for example, every 24 hours, the first multi-stage filtration and sewage discharge device 2 and the second multi-stage filtration and sewage discharge device 3 alternately operate, and the backwash water volume is 3~5m³. 3 The backwashing time is 15 minutes per hour. This multi-stage filtration and sewage discharge device can pre-filter the ultrafiltration influent entering the Y-type filter 4, and the multi-stage filtration and sewage discharge device performs periodic backwashing operations, thereby reducing sand loss in the sand filter 1, thus improving the service life of the Y-type filter 4, reducing its replacement frequency, and achieving a sand filtration effluent quality that is far higher than the ultrafiltration influent quality requirements.

[0035] The greywater reuse treatment system includes three Y-type filters 4, which are respectively installed as security filters for three sets of ultrafiltration devices 5. The pore size of the Y-type filters 4 is 50μm, and the output is 180~200m³. 3 / h. The function of Y-type filter 4 is to intercept suspended solids larger than 50μm and some fine suspended solids such as rust, slime, and microorganisms brought in by the filtered water, to prevent the ultrafiltration membrane module from being damaged by particulate matter and to prevent particulate fouling, thus providing a safety guarantee for the subsequent ultrafiltration device 5.

[0036] The ultrafiltration membrane of ultrafiltration device 5 has a pore size of 0.002~0.05μm and retains pollutants with a molecular weight of 1,000~500,000 Daltons. Ultrafiltration is a membrane separation process driven by pressure to separate substances according to their molecular weight. It can filter substances including particles, suspended solids, bacteria, viruses, protozoa, colloidal substances, and high molecular weight organic matter. The ultrafiltration membrane operates entirely on a surface removal mechanism, similar to a fine sieve. The pore size on the surface of the ultrafiltration membrane is highly uniform and the pore size distribution is very narrow. Dissolved substances and substances smaller than the membrane pore size permeate through the membrane to the filtrate (ultrafiltration permeate 17) side, while particles larger than the pore size cannot permeate. This size selectivity characteristic makes ultrafiltration a filtration method that can meet absolute filtration quality requirements. The wastewater reuse treatment system of this invention adopts advanced ultrafiltration technology. Its main purpose is to utilize its absolute filtration capability to ensure stable effluent quality unaffected by fluctuations in influent water quality, thereby extending the cleaning cycle and service life of the reverse osmosis membrane.

[0037] A single reverse osmosis unit has an output of 84m³. 3 / h, using either the BW30FR-400 / 34 membrane element manufactured by DOW Company (USA) or the PROC10 membrane element manufactured by Hydranautics, with a membrane area of ​​37m². 2 400ft 2 Calculations using specialized reverse osmosis membrane software determined that each reverse osmosis unit 9 is equipped with 132 BW30FR-400 / 34 type membrane modules. These modules are installed within 22 six-core FRP pressure vessels, arranged in a 15×7 configuration. Each reverse osmosis unit 9 is also equipped with a pipeline booster pump 8 and a safety filter 7. The safety filter 7 uses a mains pipe to enhance the operation and safety of the reverse osmosis unit 9.

[0038] The reverse osmosis unit 9 is equipped with a reverse osmosis cleaning system (not shown in the diagram). Its function is to prepare a specific cleaning solution of a certain concentration based on the fouling status of the reverse osmosis membrane, removing fouling substances from the membrane and restoring its original properties. Regardless of how thorough the raw water pretreatment is, the reverse osmosis membrane surface will still be fouled by scaling after long-term use. Therefore, the reverse osmosis cleaning system provides chemical cleaning to the reverse osmosis unit 9 every two months when the membrane module becomes fouled.

[0039] Technical efficacy verification of the wastewater reuse treatment system of this utility model:

[0040] like Figure 2 As shown, before the implementation of this utility model, from July 1st to July 10th, 2024, the flow rate of ultrafiltration water from filter No. 3 gradually decreased over time. After replacing the Y-type filter 4, the flow rate of ultrafiltration water quickly returned to 110m³ / h. 3 For water quality above a certain level, the replacement cycle for Y-type filter 4 is 2 to 3 days. When the water quality is too poor, it may even need to be replaced every day. This leads to frequent shutdowns of the greywater system to replace Y-type filter 4, which not only increases the workload of the shift team but also reduces the operating time of the greywater system and lowers the greywater return output.

[0041] Before the implementation of this utility model, the permeability of the Y-type filter 4 was significantly reduced before and after use. After use, the filter not only had burrs, but the surface of the Y-type filter 4 also had holes, making it difficult to reuse.

[0042] As shown in Table 1, the reuse rate of the greywater system before the implementation of this utility model did not meet the design requirements. As shown in Tables 2 and 3, the greywater reuse treatment system after the implementation of this utility model meets the design requirements.

[0043] .

[0044] .

[0045]

[0046] This utility model treatment system can effectively solve the problems of filter screen breakdown of the downstream Y-type filter and blockage of the ultrafiltration device caused by sand leakage in the existing greywater reuse system, improve the stability and reliability of system operation, and reduce production interruptions and cost increases caused by frequent shutdowns to replace filter screens. The treatment system can improve the quality of effluent, ensure the normal operation of the downstream ultrafiltration device and reverse osmosis device, and improve the greywater reuse efficiency. The treatment system can reduce maintenance and operating costs, and improve the economic and environmental benefits of the treatment system.

[0047] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A greywater reuse treatment system, characterized in that, The greywater reuse treatment system includes a sand filter (1), a multi-stage filtration and sewage discharge device, a Y-type filter (4), an ultrafiltration device (5), an ultrafiltration product water tank (6), a safety filter (7), and a reverse osmosis device (9) arranged in sequence according to the greywater treatment process. The sand filter device (1) accepts the effluent from the biochemical tank and the clean wastewater as raw water inlet (10), and the sand filter effluent (14) produced by it enters the multi-stage filtration backwash sewage discharge device, Y-type filter (4) and ultrafiltration device (5) in sequence. The water produced by the ultrafiltration device (5) enters the ultrafiltration permeate tank (6) for storage. The ultrafiltration permeate (17) flows through the safety filter (7) and then enters the reverse osmosis device (9). The reverse osmosis permeate (18) is transported to the recycled water tank and returned to the soda ash and salt production circulating water recycling via the recycling booster pump. The reverse osmosis concentrate is transported to the concentrate tank (19).

2. The greywater reuse treatment system according to claim 1, characterized in that, The sand filter device (1) is equipped with a sand filter backwash air inlet pipe (11), a sand filter backwash water inlet pipe (12) and a sand filter backwash drainage pipe (13), and the sand filter backwash water inlet pipe (12) is connected to at least one backwash water pump.

3. The greywater reuse treatment system according to claim 2, characterized in that, The multi-stage filtration and sewage discharge device includes a first multi-stage filtration and sewage discharge device (2) and a second multi-stage filtration and sewage discharge device (3) connected in parallel to the system. Both the first multi-stage filtration and sewage discharge device (2) and the second multi-stage filtration and sewage discharge device (3) include a three-level layered filtration layer. Each stage of the multi-stage filtration and sewage discharge device is provided with a sewage backwash inlet pipe (15) and a sewage backwash outlet pipe (16), and each sewage backwash inlet pipe (15) and sewage backwash outlet pipe (16) is connected to the incoming water source and the sewage source, respectively.

4. The greywater reuse treatment system according to any one of claims 1 to 3, characterized in that, The sand filtration device (1) includes six quartz sand filters with a diameter of 3200 mm, and the effluent flow rate of each quartz sand filter is 67 m³ / s. 3 / h, every two quartz sand filters correspond to one ultrafiltration unit (5) and one reverse osmosis unit (9); The permeate flow rate of each ultrafiltration unit (5) is 121 m³ / s. 3 / h, the recovery rate of ultrafiltration permeate (17) is ≥92.3%; Each reverse osmosis unit (9) produces 84m³ of water. 3 / h, total water production flow rate 252m³ 3 / h, reverse osmosis permeate (18) recovery rate ≥70%.

5. The greywater reuse treatment system according to claim 2, characterized in that, The backwash water pumps include two units, one for standby and one for operation, each with a capacity of 160 m³ / h. 3 / h, with a head of 0.22MPa.

6. The greywater reuse treatment system according to claim 4, characterized in that, The greywater reuse treatment system includes three Y-type filters (4) that are respectively installed as security filters for three sets of ultrafiltration devices (5). The Y-type filters (4) have a pore size of 50 μm and an output of 180~200 m³ / h. 3 / h.

7. The greywater reuse treatment system according to claim 4, characterized in that, The ultrafiltration device (5) has an ultrafiltration membrane with a pore size of 0.002~0.05μm and retains pollutants with a molecular weight of 1,000~500,000 Daltons.

8. The greywater reuse treatment system according to claim 4, characterized in that, A single reverse osmosis unit (9) has an output of 84m³. 3 / h; Each reverse osmosis unit (9) is equipped with 132 BW30FR-400 / 34 type membrane modules, and the effective membrane area of ​​each membrane module is 37m². 2 The membrane modules are installed in 22 six-core FRP pressure vessels, arranged in a 15×7 configuration.

9. The greywater reuse treatment system according to claim 8, characterized in that, Each reverse osmosis unit (9) is equipped with a pipeline booster pump (8) and a safety filter (7), wherein the safety filter (7) is a main pipe.

10. The greywater reuse treatment system according to claim 9, characterized in that, The reverse osmosis unit (9) is equipped with a reverse osmosis cleaning system, which provides chemical cleaning for the reverse osmosis unit (9) at a frequency of 2 months / time.

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