Gravity-driven advanced oxidation and membrane combined mountainous area water treatment device

Abstract

The utility model belongs to the technical field of rainwater collection and treatment in rural areas in mountainous areas, and discloses a gravity-driven advanced oxidation and membrane combined mountainous area water treatment device. A clean water tank is arranged, a water collecting tank is fixedly installed in the clean water tank, the bottom of the water collecting tank communicates with a curtain type membrane assembly through a water inlet pipe, and the two sides of the curtain type membrane assembly communicate with the water collecting tank through water outlets; a plug-flow stirrer is arranged in a water collecting tank, and under the driving of gravity, raw water directly flows through a curtain type membrane assembly from the water collecting tank under the driving of natural gravity and then is filtered into a clean water tank; the change of the membrane flux and the membrane resistance along with time is analyzed through a flow meter mounted on a water outlet formed in the curtain type membrane assembly; the wastewater enters an advanced oxidation system AOP to degrade toxic and harmful difficult-to-oxidize substances in the effluent of the curtain type membrane module. Rainwater treated by the device can be directly drunk and can also be used for irrigation, and the device is low in cost, easy to operate, free of secondary pollution, high in rainwater treatment efficiency, good in water quality effect and wide in application prospect.

Description

Technical Field

[0001] The utility model belongs to the technical field of rainwater collection and treatment in mountainous rural areas, and particularly relates to a gravity-driven advanced oxidation and membrane-combined water treatment device for mountainous areas. Background Art

[0002] At present, rural areas across the country have done a lot of work in water conservation and water resource regulation. The amount of water extraction and use has been effectively controlled, and good environmental and ecological benefits have been achieved. However, there is a lack of regional sewage resource recovery and utilization technology system, and the efficiency of sewage and unconventional water resource utilization needs to be further improved.

[0003] It is not convenient to build conventional water treatment processes (water treatment plants) in mountainous rural areas, and it is difficult to manage sophisticated facilities and equipment. To address these problems, new methods that are easy to operate, have low energy consumption, small site area, and good effect need to be proposed, such as ultrafiltration. However, traditional ultrafiltration is not applicable (not convenient enough, not adapted to local conditions) and needs to be improved.

[0004] In countries and regions with different climates and rainfall characteristics, rainwater collection is one of the most common ways to obtain drinking water. As an alternative water source, rainwater has greatly alleviated the problem of drinking water shortage.

[0005] Therefore, providing effective water purification technology is the key way to achieve this goal in mountainous areas and rural areas of arid regions. Studies have found that the main excessive water quality indicators of rainwater in mountainous areas and rural areas of arid regions during long-term storage are turbidity, chromaticity and microorganisms. The use of ultrafiltration technology can effectively remove suspended particles and pathogenic microorganisms in rainwater, especially in solving the problem of excessive microorganisms. Compared with other deep purification processes for rainwater, ultrafiltration has obvious technical advantages. However, conventional ultrafiltration processes have problems such as complex construction, cumbersome operation, frequent cleaning and high water production costs. Affected by geographical conditions and economic conditions, it is difficult to be widely used in mountainous areas and rural areas of arid regions. At the same time, due to membrane pollution generated during operation, as well as high maintenance and high energy consumption caused by membrane pollution, the promotion of traditional ultrafiltration technology in this area is difficult to achieve. In recent years, researchers have developed a new type of gravity-driven advanced oxidation and membrane combination (GOM) around the problems of water quality assurance, energy saving and consumption reduction, and simplified operation and maintenance of ultrafiltration processes. This process is a membrane separation process driven by the pressure difference generated by the water's own gravity. The effluent flux can be stabilized within a certain range during long-term operation, so there is no need for frequent backwashing, physical cleaning and chemical cleaning. Due to its simple operation and easy management and maintenance, the GOM process has been widely used in river water, lake water and gray water treatment, as well as pretreatment of seawater desalination. GOM has the technical characteristics of conventional membranes and advanced oxidation processes (AOP), avoiding their application defects. GOM-AOP is a purification technology suitable for ensuring the safety of rainwater drinking water quality in rural areas of arid regions.

[0006] The technical defects of the existing technology are: the treated rainwater cannot be directly drunk, the treatment cost is high, it is difficult to operate, and it is easy to cause secondary pollution. Utility Model Content

[0007] In order to overcome the problems existing in the related art, the disclosed embodiment of the utility model provides a mountain water treatment device of gravity-driven advanced oxidation and membrane combination.

[0008] The technical solution is as follows: a gravity-driven advanced oxidation and membrane combined mountain water treatment device, provided with a clear water tank, a water collection tank fixedly installed inside the clear water tank, the bottom of the water collection tank is connected to the curtain membrane assembly through a water inlet pipe, and the two sides of the curtain membrane assembly are connected to the water collection tank through a water outlet;

[0009] The process parameters of the curtain membrane assembly include: the length of the polyvinylidene fluoride PVDF hollow fiber membrane is 150-170mm, the packing density is 170-190kg / L; the pore size of the polyvinylidene fluoride PVDF hollow fiber membrane is 55-65nm, the maximum molecular weight cutoff is 210-230kDa, a plurality of membrane holes are opened on the polyvinylidene fluoride PVDF hollow fiber membrane, and the membrane pore size is 35-45nm; the transmembrane pressure difference of the curtain membrane assembly is 10-12kPa.

[0010] Furthermore, the filter membrane is made of polyvinyl fluoride (PVDF) hollow fiber membrane yarn.

[0011] Furthermore, a backwashing water pipe is installed at the bottom of the curtain membrane assembly, a backwashing pump is installed at the end of the backwashing water pipe, and the backwashing pump is arranged outside the clean water tank.

[0012] Furthermore, a water intake pipe is installed inside the clean water tank, a water intake pump is installed at the end of the water intake pipe, and the water intake pump is arranged outside the clean water tank.

[0013] Furthermore, a rainwater cellar filter is installed on the top of the water collection tank.

[0014] Furthermore, the clean water tank is connected to an external regulating tank intermittent aeration system through an aeration pipe.

[0015] Furthermore, a float valve is provided at a horizontal position at the bottom of the water collection tank to maintain a constant water level in the clear water tank and thus a constant transmembrane pressure difference.

[0016] Furthermore, a 10-30 cm thick layer of straw biochar or industrial waste carbon particles is set at the bottom of the water collection pool according to the local rainwater pollution level, and the particle size of the industrial waste carbon particles is 0.5-1.0 mm.

[0017] Combining all the above technical solutions, the beneficial effects of the utility model are as follows: the utility model combines the traditional ultrafiltration with gravity-driven mode, combined with rainwater collection methods such as rainwater wells and rainwater cellars in mountainous areas and rural areas, and integrates a new type of gravity-driven membrane and advanced oxidation method to collect and treat rainwater in mountainous and rural areas. Not only can rainwater be collected and recycled, but also the labor management cost and membrane cleaning cost can be reduced. The treated rainwater can be directly drunk or used for irrigation. It is low-cost, easy to operate, does not cause secondary pollution, has high rainwater treatment efficiency, good water quality effect, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, serve to explain the principles of the present disclosure;

[0019] Figure 1 It is a processing diagram of a mountain water treatment device of a gravity-driven advanced oxidation and membrane combination provided by an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of a mountain water treatment device of gravity-driven advanced oxidation and membrane combination provided by an embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of a membrane pool GOM provided in an embodiment of the utility model;

[0022] In the figure: 1. Rainwater cellar filter; 2. Water collection tank; 3. Water inlet pipe; 4. Clean water tank; 5. Curtain membrane assembly; 6. Water outlet; 7. Backwash water pipe; 8. Backwash pump; 9. Water intake pipe; 10. Water intake pump; 11. Aeration pipe; 12. Float valve. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0024] The innovation of the gravity-driven advanced oxidation and membrane combined mountain water treatment device provided by the embodiment of the utility model is that the utility model combines the unpowered membrane treatment mode with the system equipment. The traditional membrane and advanced oxidation technology adopts the gravity-driven mode, combined with the rainwater collection methods such as mountainous areas and rural rainwater wells and rainwater cellars, and integrates them into a new gravity-driven method to collect and treat rainwater in mountainous areas and rural areas.

[0025] Embodiment 1, as Figure 1 As shown, the treatment process of the mountain water treatment device of gravity-driven advanced oxidation and membrane combination provided by the embodiment of the utility model includes:

[0026] S1, using polyvinylidene fluoride PVDF hollow fiber membrane to make curtain membrane assembly 5;

[0027] S2, according to the efficiency of water treatment, screen out the process parameters of the curtain membrane assembly 5, and construct a membrane pool GOM including a water collection pool 2, a curtain membrane assembly 5 and a clear water pool 4 based on the screened process parameters; wherein the process parameters of the curtain membrane assembly 5 include: the length of the polyvinylidene fluoride PVDF hollow fiber membrane is 150-170mm, and the packing density is 170-190kg / L; the pore size of the polyvinylidene fluoride PVDF hollow fiber membrane is 55-65nm, and the maximum molecular weight cutoff is 210-230kDa, and a plurality of membrane holes are provided on the polyvinylidene fluoride PVDF hollow fiber membrane, and the membrane pore size is 35-45nm; the transmembrane pressure difference of the curtain membrane assembly 5 is 10-12kPa;

[0028] S3, a plug flow agitator is set in the water collection tank 2, and under the drive of gravity, the raw water flows directly from the water collection tank 2 through the curtain membrane module 5 under the drive of natural gravity and then is filtered to the clean water tank 4; the flow meter installed on the water outlet 6 is used to analyze the changes of membrane flux and membrane resistance over time;

[0029] S4, after being treated by the constructed membrane pool GOM, enters the advanced oxidation system AOP to degrade toxic and harmful difficult-to-oxidize substances in the effluent of the curtain membrane module 5.

[0030] In step S2, preferably, the process parameters of the curtain membrane assembly 5 include: membrane pore size of 40nm, polyvinylidene fluoride PVDF hollow fiber membrane filling density of 180kg / L, polyvinylidene fluoride PVDF hollow fiber membrane length of 160mm, polyvinylidene fluoride PVDF hollow fiber membrane average pore size of 60nm, maximum molecular weight cutoff of 220kDa, and operation time of 220-240 days;

[0031] In step S2, the curtain membrane assembly 5 is a vertical curtain-shaped membrane body.

[0032] As another implementation mode of the present invention, Figure 2 As shown, it is the principle of the mountain water treatment device of gravity-driven advanced oxidation and membrane combination provided by the embodiment of the utility model.

[0033] It can be seen from the above embodiments that the utility model has application prospects and commercial value in the vast arid mountainous rural areas. If it is promoted to most mountainous areas, the annual benefit can reach 30 million yuan. The potential social and environmental benefits such as human health and resource utilization will also be more prominent.

[0034] The utility model combines the non-powered membrane treatment mode with the system equipment. It has low energy consumption and low operating cost, and effectively solves the problem of water shortage in rural areas, especially in arid mountainous areas. It also has low cost.

[0035] In the prior art, in rural areas, especially in mountainous areas, large-scale devices are inconvenient to maintain, have low efficiency, and suffer from large power loss. The present utility model solves these problems.

[0036] Although the previous technology is applied in various places, it is costly, difficult to maintain, complex in technology, lacks professional personnel to operate, occupies a large area, and is out of service after one or two years of operation. The device of the utility model is simple and unpowered, maintenance can be completed by one person, it is simple and easy to operate, and occupies a small area.

[0037] After searching for new technologies, there are papers on both gravity drive and combined processes. Among them, there is a paper on CNKI: Research on the Development of Gravity Flow Ultrafiltration Technology and Flux Stabilization Mechanism of Rainwater in Villages and Towns in Northwest China_Zheng Yu, but the existing technology of applying gravity drive to combined processes has never been made public.

[0038] Example 2, as a detailed technical solution of the utility model, the gravity-driven advanced oxidation and membrane combined mountain water treatment device provided by the utility model embodiment includes:

[0039] (1) First, select the most suitable curtain membrane assembly: In the first stage, a total of N groups of membrane pools GOM pilot reactors are set up, which are composed of a water collection tank, a clear water tank and a curtain membrane assembly. The water collection tank is inside the clear water tank. The curtain membrane assembly is inside the clear water tank. During the screening, the curtain membrane assembly is composed of hollow fiber membranes of different materials. Experiments are conducted to obtain the best water quality, which is the curtain membrane assembly to be selected for final use. In order to analyze the effects of membrane materials, operating modes and membrane types on operating effects, this experiment used hollow fiber membranes of three materials, polyacrylonitrile (PAN), polysulfone (PS) and polyvinylidene fluoride (PVDF), and two different flat membranes (PAN and PVDF) as membrane assemblies. Finally, the curtain membrane assembly with the best operating effect was selected as PVDF material.

[0040] (2) Parameter screening: The optimal parameter curtain membrane module is operated for a long time. Figure 3 As shown, it includes: a water collection tank 2 for filtering and collecting rainwater through a rainwater cellar filter net 1;

[0041] The water collection pool 2 flows into the curtain membrane assembly 5 located at the bottom of the clean water pool 4 through the water inlet pipe 3 opened at the bottom; the filtered rainwater is further processed by the curtain membrane assembly 5 and flows into the clean water pool 4 through multiple water outlets 6 opened by the curtain membrane assembly 5;

[0042] A backwashing water pipe 7 connected to the bottom of the curtain membrane assembly 5 is installed on one side of the clear water tank 4; a backwashing pump 8 is connected to the top of the backwashing water pipe 7;

[0043] A water intake pipe 9 is installed on the other side of the clean water tank 4 , and the water intake pipe 9 pumps clean water out of the clean water tank 4 through a connected water intake pump 10 .

[0044] The curtain membrane assembly 5 uses polyvinylidene fluoride (PVDF) hollow fiber membrane. Experiments show that the above parameters are obtained through experimental screening. In the curtain membrane assembly of PVDF material, considering the influence of different parameters on the operation effect of the membrane pool GOM, the most suitable parameters are screened out as follows:

[0045] The optimal design value of membrane pore size is 40nm. The packing density of PVDF hollow fiber membrane is 180kg / L, 160mm is the optimal length of membrane, the average pore size of membrane is 60nm, and the maximum molecular weight cutoff is 200kDa. The operation time is 230 days. The water treatment efficiency is the highest.

[0046] It can be understood that the membrane pore size is a hole, and the average pore size of the membrane thread refers to the diameter of a membrane thread. There are many membrane holes on a membrane thread. Many membrane threads form a curtain membrane assembly 5, and the curtain membrane assembly 5 can be a vertical curtain-shaped membrane body, so it can be a cross-curtain membrane.

[0047] (3) The materials used in the membrane pool GOM of the utility model are organic glass (inner surface of the water collection pool 2 and the clear water pool 4) and concrete (outer surface of the clear water pool 4), and a rainwater pool wellhead filter screen 1 with an installation aperture of 0.5-1.0 mm is set at the wellhead of the rainwater pool. The water collection pool 2 is the outlet 6 of the curtain membrane module 5 below the rainwater pool, and the height difference between the position of the PVDF membrane of the curtain membrane module 5 and the membrane is 80-100 cm, and the transmembrane pressure difference of the curtain membrane module 5 is 10-12 kPa.

[0048] It can be understood that the transmembrane pressure difference is determined by many factors, which is related to the height but not the determining factor. It is mainly affected by the state of the filter membrane composed of polyvinylidene fluoride (PVDF) hollow fiber membrane. During operation, if it is greater than 12kPa, the filter membrane resistance is too large, indicating that the filter membrane is contaminated and needs to be cleaned. If it is lower than 10kPa, it means that the water volume is small and the efficiency is low. At this time, it is better to store water than to treat it. When the water volume reaches a certain level, that is, the pressure difference is as large as 10-12kPa, the system starts to operate with the highest efficiency! The pressure is monitored by a pressure gauge, and the operation mode can be adjusted manually according to the pressure.

[0049] Furthermore, a float valve 12 is provided at a horizontal position at the bottom of the water collecting tank 2 to maintain a constant water level in the clear water tank 4 and thus a constant transmembrane pressure difference.

[0050] When the water level in the clean water tank approaches or is flush with the bottom of the water collection tank, back pressure will be formed and water will flow back. At this time, the float valve will indicate the water level and drain the clean water tank or stop filtering.

[0051] A 10-30 cm thick straw biochar or industrial waste carbon particle layer (particle size is 1.0-3.0 mm) can be set at the bottom of the water collection pool 2 according to the local rainwater pollution level.

[0052] One side of the clean water tank 4 is provided with a water intake pipe 9 and a water intake pump 10, and the other side is connected to the curtain membrane module 5 to set a backwash water pipe 7 and a backwash pump 8. After the membrane treatment is completed, it enters the advanced oxidation system AOP, and the system is turned on for the final end treatment when it is running.

[0053] The advanced oxidation process of the advanced oxidation system AOP is a new technology. This technology activates molecules in the water outlet of the curtain membrane module 5 through a photoelectrochemical reaction, and at the same time produces an oxidant OH (hydroxyl radical) with extremely strong oxidizing ability, which can quickly degrade all toxic and harmful difficult-to-oxidize substances in the water, so that the TOC in the water is finally close to zero. At the same time, the decolorization and deodorization and powerful sterilization functions make the water quality of the outlet higher. After inspection, the water quality treated by the curtain membrane module 5 and the advanced oxidation system AOP can meet the latest national standards for drinking water. The clear water tank 4 is connected to the intermittent aeration system of the external regulating tank through the aeration pipe 11. The intermittent aeration system of the regulating tank forms a good anaerobic condition, and the anaerobic condition accelerates the nitrification and denitrification process.

[0054] The sludge formed at the bottom of the clear water tank 4 is returned to the intermittent aeration system of the regulating tank through the membrane tank sludge return system. The membrane tank sludge return system is conducive to regulating the concentration of GOM microorganisms in the membrane tank and maintaining the activity of microorganisms. The advanced PLC automatic control system program design ensures the long-term automatic normal operation of the system and energy saving and consumption reduction. Low operating cost, the existence of the advanced oxidation system AOP does not require the addition of any flocculants or advanced oxidation disinfectants.

[0055] Exemplary, advanced PLC automatic control system programs include: when the treatment efficiency is low, the backwash pump 8 will be automatically controlled by PLC to perform backwashing or chemical cleaning. When the concentration of water pollutants is measured to begin to increase, straw biochar or industrial waste carbon granules and / or activated carbon microorganisms are added to the top of the water collection tank. The specific amount of addition depends on the water quality, generally 40 mg / L straw biochar or industrial waste carbon granules. The activated carbon microorganisms are determined according to the specific physical and chemical properties of the sewage.

[0056] (4) In the embodiment of the utility model, data observation includes: in order to ensure the uniformity of the water quality of each group of influent, a plug flow agitator is set in the water collection tank. Under gravity drive, the raw water flows directly from the water collection tank 2 through the curtain membrane module 5 and is filtered into the clear water tank 4. The outlet 6 of the curtain membrane module 5 is provided with a flow meter for accurately analyzing the change of membrane flux and membrane resistance over time.

[0057] Exemplarily, when the flow meter determines that the flow rate is too low, backwashing will be automatically initiated, and when the flow rate is restored after flushing, the process will continue.

[0058] (5) In the embodiment of the utility model, the curtain membrane assembly 5 is also contaminated, blocked, cleaned and replaced: In the utility model, during the operation, it is not necessary to adopt any physical, chemical or other cleaning measures to control the membrane contamination and blockage, and the required supporting auxiliary equipment is small, which is significantly different from the traditional ultrafiltration process. In the long-term filtration process, the curtain membrane assembly 5 will continuously intercept pollutants and microorganisms, and a layer of biological filter cake layer will gradually form on the surface of the curtain membrane assembly 5, which can enhance the removal of pollutants. When the water in the water collection tank 4 does not infiltrate, turn on the plug flow agitator in the water collection tank 2, and the backwash water pipe 7 and backwash pump 8 connected to the curtain membrane assembly, and backwash for 5-20 minutes. After the flushing is completed, check whether the flow rate has reached the initial value. If it has not reached, continue backwashing for 5 minutes. After reaching the initial flow value, it can be used normally.

[0059] In the utility model, the rainwater cellar wellhead filter screen 1 with a pore size of 0.5-1.0mm is cleaned and reused after the rainy season every year, and the 10-30cm thick straw biochar or industrial waste carbon particle layer (particle size is 0.5-1.0mm) at the bottom of the water collection pool 2 is generally replaced one month after the rainy season, or once every 280 days, according to the frequency of rain and pollution. The curtain membrane assembly 5 can generally be used for 3-4 years, and then the membrane wire needs to be replaced according to the damage of the curtain membrane assembly 5.

[0060] Through the above embodiments, the degradation of pollutants includes: the average annual degradation rate of COD, ammonia nitrogen, turbidity, chromaticity, and heavy metals is: 73%, 43%, 96%, 87%, and 54%. The degradation rate of the membrane after contamination after one year of use is: 68%, 49%, 96%, 71%, and 53%. The degradation rate after adding a straw biochar or industrial waste carbon particle layer (particle size is 1.0-3.0mm) at the bottom of the water collection tank 2 is: 81%, 73%, 96%, 93%, and 84%. Moreover, after adding a straw biochar or industrial waste carbon particle layer, the pollution and blockage time of the membrane system increased from 240 days to about 280 days. It shows that adding a straw biochar or industrial waste carbon particle layer at the bottom of the water collection tank 2 can better purify rainwater, and at the same time alleviate the pollution and blockage of the curtain membrane assembly 5. Experiments show that the degradation of special pollutants is shown in Table 1.

[0061] Table 1

[0062]

[0063]

[0064] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0065] Experiments show that the utility model establishes a gravity-driven advanced oxidation and membrane combined mountain water treatment device, which integrates the traditional ultrafiltration with gravity-driven mode, combined with rainwater collection methods such as mountainous areas and rural rainwater wells and rainwater cellars, into a new gravity-driven ultrafiltration method for collecting and treating rainwater in mountainous and rural areas. Not only can rainwater be collected and recycled, but also the labor management cost and curtain membrane cleaning cost can be reduced. The treated rainwater can be directly drunk or used for irrigation. It is low-cost, easy to operate, does not cause secondary pollution, has high rainwater treatment efficiency, and good water quality, and has broad application prospects.

[0066] The above description is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A gravity-driven advanced oxidation and membrane combined mountain water treatment device, comprising a clear water tank (4), wherein a water collecting tank (2) is fixedly installed inside the clear water tank (4), characterized in that: The bottom of the water collection tank (2) is connected to the curtain membrane assembly (5) via a water inlet pipe (3), and both sides of the curtain membrane assembly (5) are connected to the water collection tank (2) via a water outlet (6); The process parameters of the curtain membrane assembly (5) include: the length of the polyvinylidene fluoride PVDF hollow fiber membrane is 150-170 mm, the packing density is 170-190 kg / L; the pore size of the polyvinylidene fluoride PVDF hollow fiber membrane is 55-65 nm, the maximum molecular weight cutoff is 210-230 kDa, a plurality of membrane pores are provided on the polyvinylidene fluoride PVDF hollow fiber membrane, and the membrane pore size is 35-45 nm; the transmembrane pressure difference of the curtain membrane assembly (5) is 10-12 kPa.

2. The gravity-driven advanced oxidation and membrane combined mountain water treatment device according to claim 1, characterized in that: The filter membrane is made of polyvinyl fluoride (PVDF) hollow fiber membrane yarns.

3. The gravity-driven advanced oxidation and membrane combined mountain water treatment device according to claim 1, characterized in that: A backwashing water pipe (7) is also installed at the bottom of the curtain membrane assembly (5), and a backwashing pump (8) is installed at the end of the backwashing water pipe (7). The backwashing pump (8) is arranged outside the clear water tank (4).

4. The gravity-driven advanced oxidation and membrane combined mountain water treatment device according to claim 3, characterized in that: A water intake pipe (9) is also installed inside the clean water tank (4), and a water intake pump (10) is installed at the end of the water intake pipe (9), and the water intake pump (10) is arranged outside the clean water tank (4).

5. The gravity-driven advanced oxidation and membrane combined mountain water treatment device according to claim 1, characterized in that: A rainwater cellar filter screen (1) is installed on the top of the water collection tank (2).

6. The gravity-driven advanced oxidation and membrane combined mountain water treatment device according to claim 4, characterized in that: The clear water tank (4) is connected to an external regulating tank intermittent aeration system via an aeration pipe (11).

7. The gravity-driven advanced oxidation and membrane combined mountain water treatment device according to claim 5, characterized in that: A float valve (12) is provided at a horizontal position at the bottom of the water collection tank (2) for maintaining a constant water level in the clear water tank (4) and thereby a constant transmembrane pressure difference.

8. The gravity-driven advanced oxidation and membrane combined mountain water treatment device according to claim 7, characterized in that: A 10-30 cm thick layer of straw biochar or industrial waste carbon particles is arranged at the bottom of the water collection pool (2) according to the local rainwater pollution level. The particle size of the industrial waste carbon particles is 0.5-1.0 mm.

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