CN115504619A

CN115504619A - Water body comprehensive treatment method based on photocatalysis

Info

Publication number: CN115504619A
Application number: CN202110698062.4A
Authority: CN
Inventors: 仇健; 许亮; 庞治
Original assignee: Jiangsu Shuangliang Environmental Technology Co ltd
Current assignee: Jiangsu Shuangliang Environmental Technology Co ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-12-23

Abstract

The application discloses a water body comprehensive treatment method based on photocatalysis, which comprises the following steps: carrying out water quality investigation on a water body to be treated, and determining key water quality purification factors; determining a configuration strategy of a treatment facility according to the environmental conditions of the water body to be treated; after the treatment facilities are configured in the water body to be treated, monitoring the key water quality purification factors; judging that the variation trend of the key water quality purification factors deviates from a treatment target, and adjusting the configuration strategy of the treatment facility; and confirming that the water body to be treated reaches the treatment target, and withdrawing the treatment facility. According to the method, before the treatment facilities are laid, important water quality purification factors are determined through water quality investigation and environmental investigation, the arrangement of the treatment facilities, particularly the photocatalytic network, is specifically designed, and the effects of short-term water quality improvement, medium-term ecological restoration and long-term healing self-cleaning are achieved.

Description

Water body comprehensive treatment method based on photocatalysis

Technical Field

The application relates to the field of sewage treatment, in particular to a water body comprehensive treatment method based on photocatalysis.

Background

In the face of the current situation of pollution of water environment and the increasing list of pollutants, the existing water body treatment method cannot well solve the problem of water body pollution, the water body mainly refers to a water body which serves cities and has a certain function, such as a water body serving as a drinking water source area and a water body serving as a landscape facility, and relates to ponds, sewage receiving ponds, oxidation ponds, lakes, water source areas, wetlands, slow flow riverways, headquartered creeks and the like in form.

The existing water body treatment method mainly comprises single means (physical, chemical and biological) treatment and composite means treatment, but the aim of ecological environment protection treatment cannot be achieved.

Disclosure of Invention

The application aims to overcome the defects of the prior art and provide a water body comprehensive treatment method based on photocatalysis, which meets the requirements of ecological environment protection treatment and green development.

In order to achieve the technical purpose, the technical scheme adopted by the application is as follows:

a water body comprehensive treatment method based on photocatalysis comprises the following steps:

carrying out water quality investigation on a water body to be treated, and determining key water quality purification factors;

determining a configuration strategy of a treatment facility according to the environmental conditions of the water body to be treated;

after the treatment facilities are configured in the water body to be treated, monitoring the key water quality purification factors;

judging that the variation trend of the key water quality purification factors deviates from a treatment target, and adjusting the configuration strategy of the treatment facility;

and confirming that the water body to be treated achieves the treatment target, and withdrawing the treatment facility.

Specifically, the water body to be treated meets at least one of the following conditions:

the daily illuminance on the water surface is more than 10000Lux; the water flow speed is not more than 0.5m/s; keeping the water flow speed not more than 0.5m/s for more than 4 days; the water depth is more than 0.5m; the air pollution degree of the upwind area of the water surface is below a preset value; the wind power on the water surface is 1-4 grades all year round; the water body is a closed water body or a semi-closed water body which is not communicated with the navigation.

Further, the water quality investigation of the water body to be treated and the determination of the key water quality purification factors comprise:

arranging a treatment area in a water body to be treated;

collecting detection data of water quality indexes in the treatment area in different water flow states within treatment time;

and screening out important research indexes from all water quality indexes as the important water quality purification factors.

Further, the treatment area comprises a mesh-laying area for laying the photocatalytic mesh and a control area; within the treatment time, the detection data of the water quality indexes are collected under the following conditions in sequence:

collecting detection data of all water quality indexes in a static flow state, and screening primary screening water quality indexes with detected numerical values;

collecting detection data of the primary screening water quality index respectively in a microflow state and a water body disturbance state, and screening out a reference water quality index with a detection value having obvious change;

and screening key water quality indexes from the reference water quality indexes to serve as the key water quality purification factors.

Preferably, the number of the key water quality indexes is not less than 50% of the number of the reference water quality indexes.

Optionally, the treatment facility comprises a photocatalytic net, wherein the photocatalytic net comprises a net frame and reticular photocatalytic functional fibers fixed on the net frame; the abatement facility also includes bio-ropes and a submerged plant tank attached to the photocatalytic network.

Specifically, the photocatalytic functional fiber comprises a polypropylene filament as a substrate and a carbon-based metal semiconductor coated on the surface of the polypropylene filament.

Optionally, the paving area of the photocatalytic net accounts for 20-40% of the area of the water body to be treated; the photocatalytic net is laid in the central area of the water body to be treated; the paving position of the photocatalytic net is 5-20 cm away from the water surface; the photocatalytic net is fixed through a water-bottom pile or a water-bottom anchor block; the longitudinal axis of the photocatalytic net is parallel to the perennial main wind direction of the water surface.

Optionally, the treatment facility comprises a deep plug flow device adapted for use with a body of water to be treated having a water depth greater than 4m.

Further, the determining that the variation trend of the key water quality purification factor deviates from a treatment objective and adjusting the configuration strategy of the treatment facility includes:

periodically evaluating the current water quality grade of the water body to be treated according to the detection data of the current key water quality purification factors;

configuring management measures of corresponding grades for the treatment facilities according to the current water quality grade;

and judging that the current water quality grade of the water body to be treated deviates from a preset water quality grade target, and adjusting the configuration content of the treatment facilities and/or adjusting the content of management and maintenance measures.

Optionally, the management measures include at least one of:

patrolling the periphery of the water body to be treated at a specified frequency;

cleaning water surface garbage and floating objects of a water body to be treated at a specified frequency;

and cleaning the net surface bacterial membrane of the photocatalytic net in the treatment facility at a specified frequency.

Compared with the prior art, the method has the following advantages:

(1) According to the method, a treatment facility comprising a photocatalytic net is paved on the water surface for treatment, the photocatalytic net is made of a photocatalytic material, organic matters in water can be decomposed without selectivity, the transparency of the water body is promoted to be improved, the oxidation-reduction potential is increased, the biodegradability of pollutants in the water is improved, and the dissolved oxygen in the water is increased;

(2) According to the method, before the treatment facilities are laid, important water quality purification factors are determined through water quality investigation and environmental investigation, the arrangement of the treatment facilities, particularly the photocatalytic network, is subjected to targeted design, and the effects of short-term water quality improvement, medium-term ecological restoration and long-term healing self-cleaning are realized;

(3) According to the method, after the treatment facilities are laid, the treatment facilities are required to be managed and maintained according to the water quality grades, the change trend of key water quality purification factors is tracked in time, the configuration content of the treatment facilities and the content of management and maintenance measures are flexibly adjusted, and the water body to be treated is subjected to refined and personalized treatment.

Drawings

Fig. 1 is a schematic top view of a photocatalytic network used in the present application.

Fig. 2 shows the contents and objectives of the water quality survey and the environmental survey according to the present application.

FIG. 3 is a schematic diagram of a remediation zone for a site employing the present application.

FIG. 4 is an enlarged view of the abatement zone scene of FIG. 3.

Fig. 5 is an overhead view of another source area to which the present application is applied.

FIG. 6 is a table of water quality improvement item data records of the water source area indicated in FIG. 5.

Detailed Description

The present application is described in further detail below with reference to the attached drawings and the detailed description.

The application relates to a water body comprehensive treatment method based on photocatalysis, which comprises the following steps:

s1: carrying out water quality investigation on a water body to be treated, and determining key water quality purification factors;

s2: determining a configuration strategy of a treatment facility according to the environmental conditions of the water body to be treated;

s3: after the treatment facilities are configured in the water body to be treated, monitoring the key water quality purification factors; judging that the variation trend of the key water quality purification factors deviates from a treatment target, and adjusting the configuration strategy of the treatment facility;

s4: and confirming that the water body to be treated achieves the treatment target, and withdrawing the treatment facility.

Specifically, the photocatalysis refers to a phenomenon that water molecules on the surface of a titanium dioxide electrode are decomposed into hydrogen and oxygen under the irradiation of ultraviolet light, which is also called as a photolysis phenomenon of water, oxygen generated by the phenomenon can be dissolved in water again to improve the dissolved oxygen of the water, and for a water body rich in biomass, the dissolved oxygen is improved, so that the benign development of the biomass is facilitated, and a hole-electron pair, a hydroxyl radical and a superoxide radical with strong oxidizing property are generated by the photocatalysis reaction, so that the treatment of the polluted water body is realized based on the principle. This application makes the photocatalytic material who contains titanium dioxide netted to lay on the water body surface, induce the emergence of light catalytic reaction through sunshine. The utility model provides a photocatalysis net, preferred including the cloth net frame to and fix the netted photocatalysis function fibre on the cloth net frame, the photocatalysis function fibre uses the polypropylene silk as the base, at polypropylene silk surface coating carbon base metal semiconductor, in a possible implementation, the photocatalysis function fibre is stratum basale, intermediate protective layer, sunlight/red light response layer, quantum transition layer, quantum size effect photocatalysis layer from inside to outside in proper order, because quantum size effect photocatalysis layer has adopted the titanium dioxide of doping graphite alkene base, consequently, the photocatalysis net of this application also is called graphite alkene photocatalysis net.

Referring to fig. 1, the photocatalytic functional fiber is prepared into standard units 1, every three standard units 1 are sewn and then fixed on a standard cloth frame 2, a plurality of standard cloth frames 2 can be combined and spliced to form a longitudinal photocatalytic net, and each longitudinal photocatalytic net can be fixed with each other through a connecting rod to form a piece of treatment facility on the surface of a water body. Furthermore, the treatment facility also comprises a biological rope connected below the cloth screen frame, and a proper amount of anaerobic microorganisms are fixed on the biological rope, so that the water quality treatment of the underwater anaerobic deficient environment is realized. The treatment facility further comprises a submerged plant box fixed on the periphery of the cloth screen frame, dissolved oxygen of the water body is further improved by adding submerged plants, and the submerged plants also provide habitat and food for small animals in the water body, so that ecological restoration of the water body is facilitated. In order to make the photocatalytic net capable of suspending in water, a fixing measure is needed in water, and a possible embodiment includes fixing underwater piles or fixing underwater anchor blocks, and in addition, floating rods 3 and a balance weight should be arranged on the net distribution frame for adjusting the height of the photocatalytic net in water.

Further, the treatment facility can also be combined with other ecological restoration or sewage treatment technologies by means of expansion, superposition and recombination, such as ecological concrete technology, ecological dredging technology, magnetization induction technology, composite medium type floating beds and the like.

The water body to be treated is mainly water body according with the use scene of treatment facilities. The application relates to a treatment facility with a photocatalytic net as a main element, which is preferably applied to a water body with at least one of the following conditions:

(1) The day illumination of the water surface is more than 10000Lux, and more preferably, the day illumination is more than 50000Lux; in general, the vegetation for shading the sun around the water body to be treated is less, which is beneficial to fully receiving sunlight irradiation in the daytime, if the sunshine intensity is insufficient in the daytime or the photocatalytic reaction needs to continuously occur at night, the daylight lamp can be additionally arranged on the water surface.

(2) The water flow speed is not more than 0.5m/s, or the water flow speed is not more than 0.5m/s after more than 4 days (or about 5 days) are kept; therefore, the method and the treatment facility are suitable for closed water bodies of ponds, sewage receiving ponds, oxidation ponds, lakes, water source areas, wetlands and the like, and semi-closed water bodies of slow-flow rivers, duantou creeks and the like, and further, the closed water bodies and the semi-closed water bodies are not communicated so as to prevent the mutual influence between passing ships and the treatment facility.

(3) The annual wind power on the water surface is in the range of 1-4 grades, namely, the water surface mainly comprises light wind and breeze; china coastal areas are mostly affected by monsoon, typhoons occur frequently in summer, and offshore water bodies affected by typhoons are greatly disturbed, so that the laying and maintenance of the treatment facility are not facilitated, the due treatment effect is difficult to exert, the water flow can be enhanced in strong wind climate, and the treatment facility is not beneficial to exerting the effect when the water flow speed range is exceeded.

(4) The air pollution degree of the upwind area of the water surface is below a preset value; if the windward area of the water surface has an industrial area, the waste gas, waste water and waste residues generated in the industrial area are controlled below a preset value so as to avoid secondary pollution to the water body to be treated or influence the treatment effect of treatment facilities.

(5) The water depth is more than 0.5m, the photocatalysis net should be suspended at 5-20 cm under water according to the using condition of the photocatalysis net, the condition of insufficient water depth is difficult to provide enough buoyancy for the photocatalysis net, if the water depth exceeds 4m, a deep-layer plug flow device should be arranged under water to promote the exchange of deep-layer water and shallow-layer water.

Further, the ecological survey as shown in fig. 2 includes a work of counting the kinds and distribution states of various animals and plants in water, including but not limited to statistics for benthic animals, fish, submerged vegetation, and plankton. The assessment means employed include, but are not limited to, the use of biodiversity index, shannon index, and ecological integrity index. The ecological investigation is carried out, the purpose is to carry out targeted regulation and control on the water ecology and rebuild aquatic vegetation, and the treatment facility comprising the photocatalytic net is favorable for restoring the ecology of the water body to be treated to realize self-purification circulation on the basis of establishing the artificial floating wetland and the microbial reaction bed.

The environmental survey in fig. 2 includes comprehensive analysis of the hydrological conditions, environmental characteristics, water shoreline and topographic geology of the periphery of the body of water to be remediated, providing reference for the configuration of the remediation facilities. On the other hand, the data provided by the environmental survey can also be used for water conservancy allocation, controlling the hydrokinetic circulation and providing data support for constructing ecological landscapes and ecological wetlands.

Ecological investigation and environmental survey can also utilize unmanned aerial vehicle technique to assist in order to obtain more complete more meticulous monitoring data.

As known to those skilled in the art, china is divided into 5 types according to the function height according to the environmental function and the protection target of surface water and water areas: class I, which is mainly applicable to head water and national natural reserve; the type II is mainly suitable for a primary protection area of a surface water source of centralized domestic drinking water, a rare aquatic organism habitat, a fish and shrimp spawning site, a shuttle bait field of larval and juvenile fishes and the like; class III, mainly suitable for the secondary protection area of the surface water source of the centralized domestic drinking water, fish and shrimp overwintering fields, migration passages, water plant culture areas and other fishery water areas and swimming areas; class IV, which is mainly applicable to general industrial water areas and recreational water areas which are not directly contacted with human bodies; and class V, which is mainly suitable for agricultural water areas and water areas with general landscape requirements. In addition, the waters evaluated as poor class v and black and odorous had essentially no function of use. According to the division, the water comprehensive treatment method based on photocatalysis is suitable for water treatment of water with water quality above class III, and the treatment target is determined according to the ecological condition, the environmental condition and the treatment duration of the water, for example, the water evaluated as the water quality of class III can reach the water quality standard of class II after treatment, but not necessarily reach the water quality standard of class I, and the treatment target of the water with the water quality of class III should be set to reach the water quality standard of class II as much as possible; for another example, after comprehensively considering the ecological conditions, environmental conditions and treatment duration of the water body, the water body evaluated as inferior v class can be evaluated to reach class iv, if the treatment duration is prolonged, the water body may reach the grade between class iii and class iv, and the treatment target of the water body of inferior v class should be set to meet the class iv water quality standard. Furthermore, the change trend in the treatment duration can be predicted by establishing a short-term or medium-term early warning model, and more accurate data can be provided for adjusting the configuration strategy of the treatment facility.

After the water body to be treated adopts the water body comprehensive treatment method based on photocatalysis, the physical changes comprise the improvement of the transparency of the water body and the increase of dissolved oxygen in the water body; the chemical changes comprise the decomposition of toxic and harmful organic matters of edema, and various chemical indexes are reduced; the biological change comprises activating a water seed bank, adjusting the structure of algae seeds and carrying out ecological self-organization reconstruction. The apparent black and odor is eliminated in 7 days on average, the key indexes are obviously improved in 30 days, the COD removal rate reaches 43%, the ammonia nitrogen removal rate reaches 68%, the TP removal rate reaches 75%, and the DO increase rate reaches 200%.

The method for comprehensive treatment of water body based on photocatalysis of the present application is further described by the following examples.

The comprehensive water body treatment method based on photocatalysis is developed in a city drinking water source area, a treatment area is set for experimental treatment before the whole water area is treated integrally, the treatment period spans 455 days, and all detected water quality indexes are 250. As shown in the figure3, selecting a lapping area T1 with the area of about 5000m ² The depth of water is 6-7 m, the area of the lapping zone T3 is about 5000m ² The water depth is 5-6 m, the contrast area C1 is about 5000m ² The water depth is 6-7 m. The lapping area of the lapping area T1 accounts for 32% of the area of the water area of the treatment area, and a biological rope with the length of 2m is hung under the photocatalytic net; the lapping area of the lapping area T3 accounts for 63.3% of the area of the water area of the treatment area, and the length of the biological rope is 4m. The control zone C1 was not covered with a photocatalytic net.

The treatment time is divided into three stages:

the first stage, 251 days in total, collecting the detection data of all water quality indexes in a static flow state, wherein 250 items of the detection data are detected; screening out 114 primary screening water quality indexes with detected numerical values;

in the second stage, 152 days are spent, the detection data of the primary screening water quality index are collected respectively in a micro-flow state and a water body disturbance state, and 81 reference water quality indexes with obviously changed detected values are screened out;

and in the third stage, 60 important water quality indexes are screened from the reference water quality indexes through comprehensive analysis and serve as important water quality purification factors.

The 250 items of all water quality indexes comprise 109 items in the 'surface water environment quality standard', 30 items in the 'sanitary standard for drinking water', 11 items in the 'drinking natural mineral water' and 'national standard package drinking water for food safety', 26 items of biodiversity indexes, 64 items of non-nationally controlled trace organic pollutants and 10 other indexes.

The 60 items of the key water quality purification factors comprise 13 items of physicochemical indexes, 10 items of algae, 3 items of algal toxins, 11 items of antibiotics, 10 items of endocrine disruptors, 4 items of zooplankton, 4 items of benthonic animals, 2 items of higher aquatic plants and 3 items of fishes.

The geographical position of the water source area is influenced by east Asia monsoon, during the first stage, the water source area is dominated by east Asia monsoon, and the wind power is mainly in grade 1-4; during the second stage, northeast wind prevails, and the wind power is mainly in 1-4 levels. Therefore, the annual wind power of the water source site is mainly light wind and breeze, and the water source site is suitable for water quality treatment of the whole water area by adopting the method. Referring to fig. 3 and 4, due to the periodic variation of the wind direction of the monsoon, the longitudinal axis of the photocatalytic net is not suitable for being adjusted periodically along with the wind direction, and the longitudinal axis of the photocatalytic net is set to intersect with the prevailing wind direction at an acute angle through comprehensive consideration, so that the situation that the vertical intersection increases the up-and-down floating of the photocatalytic net in water is avoided.

In this example, the experimental data in the treatment area shows that the water transparency is improved by 2.3 times, the total suspended matter is reduced by 97%, and the growth rate of algae in the water is reduced by 30-60%, indicating that the aquatic environment is developing in the forward direction. Harmful trace organic matters in the water body are obviously reduced, the removal rate of endocrine disruptors is improved by 27%, the removal rate of antibiotics is improved by 15%, the production of algal toxins is effectively inhibited, and the water body environment is improved. The plant coverage rate reaches 3 times before treatment, the average growth height reaches 5 times before treatment, the biomass of the radish snails is increased by 169 times, the density is increased by 488 times, the biological diversity is obviously improved, the water ecosystem is continuously and healthily developed, and the water body purification efficiency and effect are improved.

In the subsequent stage of treating the whole water area, 60 key water quality purification factors screened out in a treatment area are used as evaluation indexes to guide the configuration and management and maintenance modes of treatment facilities.

The method for comprehensively treating the water body based on photocatalysis is implemented in the whole water area of the drinking water source area of another city, and comprises the following steps:

the water source area of the embodiment is located in coastal areas of east China, the maximum water level area is about 24000 square meters, the daily water level and water surface area are about 15000 square meters, and the water depth is nearly 20m. During the rich water period, the water quality is relatively good, various indexes are superior to those of surface water III, during the dry water period, the water quality is deteriorated (refer to table 1) due to less rainfall, large evaporation and insufficient hydrodynamic force, and the water body is difficult to reach the raw water standard of drinking water. Therefore, in order to ensure the water quality of the reservoir to be stable and maintain the index of the drinking water source (surface II type water), the treatment is needed.

TABLE 1 background data

Before the photocatalytic network is laid in the whole water area, a treatment area is set for screening key water quality purification factors, and a configuration strategy of a treatment facility is formulated by integrating ecological conditions, environmental conditions and treatment targets of the water source area. Referring to fig. 5, 1200 photocatalytic nets are laid on the water source land, the total number of the photocatalytic nets is 4860 square meters, and the photocatalytic nets account for about 32% of daily water level area; placing 180 semi-submerged plant floating frames, wherein the number of the semi-submerged plant floating frames is 540 square meters in total; 4560 biological ropes are hung for 11400m; 4900 PFU balls are hung. According to the physical and chemical properties of the photocatalytic network, the laying area of the photocatalytic network generally accounts for 20-30% of the area of the water body to be treated, and can reach 40% if necessary, in particular, if the COD value is in the range of bad V class, the laying area of the photocatalytic network can reach 40%, and if the COD value is in class II, the laying area of the photocatalytic network can be 20% at least.

It can be seen that the photocatalytic networks of the source site are laid in the central area of the water area, and the longitudinal axes of the photocatalytic networks are parallel to each other and are as parallel as possible to the perennial prevailing wind direction of the water surface of the source site.

After the photocatalytic network is laid, the current water quality grade of the water source area is periodically evaluated according to the detection data of the current key water quality purification factors; the photocatalytic net is subjected to graded management according to the current water quality grade, the corresponding relation between the water quality grade and management measures is shown in a table 2, and the method mainly relates to stipulating the frequency of patrol around the water body to be treated, the frequency of cleaning garbage and floating objects on the water surface of the water body to be treated and the frequency of cleaning a net surface bacterial film of the photocatalytic net in the water body to be treated.

Further, the cleaning and maintenance method of the photocatalytic network should follow the following rules: (1) The net surface is cleaned by a plastic appliance and is rinsed softly on the water surface, so that sundries and fungus membranes on the net surface fall off to achieve the cleaning effect. (2) Under the condition of enough water depth, the net surface is overturned to achieve the cleaning effect. (3) The photocatalysis net of each unit needs to be checked to be normally fixed without falling off and damage. (4) The observation shows that the net surface is yellow after a layer of oxygen consuming mycoderm is attached, which is a normal phenomenon and can not be cleaned temporarily, if the net surface mycoderm is too thick, the bottom mycoderm needs to be cleaned when the bottom mycoderm is black in an anaerobic mode. And (5) forbidding a high-pressure water gun to shoot the net surface.

Referring to fig. 6, it can be known from the chart data that the ammonia nitrogen content, the total phosphorus content and the COD value of the water source area are in a whole descending trend, and the latest data detection result reaches the standard of the class ii water of the surface water. The algae diversity is counted, the density of the algae in the water is kept at a lower level, the total algae biomass control is reduced to 1/3 of the original value, and the risk of algal bloom is effectively avoided. Meanwhile, the algae species composition does not use diatom as a single dominant species any more, and the algae structure is gradually balanced.

TABLE 2 management maintenance control table

In summary, the water comprehensive treatment method based on photocatalysis of the application comprises the following steps: carrying out water quality investigation on a water body to be treated, and determining key water quality purification factors; determining a configuration strategy of a treatment facility according to the environmental conditions of the water body to be treated; after the treatment facilities are configured in the water body to be treated, monitoring the key water quality purification factors; judging that the variation trend of the key water quality purification factors deviates from a treatment target, and adjusting the configuration strategy of the treatment facility; and confirming that the water body to be treated reaches the treatment target, and withdrawing the treatment facility. Before the method is laid with treatment facilities, the method determines key water quality purification factors through water quality investigation and environmental investigation, carries out targeted design on the arrangement of the treatment facilities, particularly a photocatalytic network, and realizes the effects of short-term water quality improvement, medium-term ecological restoration and long-term healing self-cleaning.

The above embodiments are only preferred embodiments of the present application, but not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present application should be construed as equivalents and are included in the scope of the present application.

Claims

1. A water body comprehensive treatment method based on photocatalysis is characterized by comprising the following steps:

and confirming that the water body to be treated reaches the treatment target, and withdrawing the treatment facility.

2. The method of claim 1, wherein the body of water to be remediated meets at least one of the following conditions:

the daily illumination of the water surface is more than 10000Lux;

the water flow speed is not more than 0.5m/s;

keeping the water flow speed not more than 0.5m/s for more than 4 days;

the water depth is more than 0.5m;

the air pollution degree of the upwind area of the water surface is below a preset value;

the wind power on the water surface is 1-4 grades all year round;

the water body is a closed water body or a semi-closed water body which is not communicated with the navigation.

3. The method of claim 1, wherein the water quality survey of the water body to be treated and the determination of the key water quality purification factor comprises:

arranging a treatment area in a water body to be treated;

4. The method of claim 3, wherein the remediation zone comprises a lapping zone and a control zone where the photocatalytic mesh is lapped; within the treatment time, the detection data of the water quality indexes are collected under the following conditions in sequence:

collecting all detection data of the water quality indexes in a static flow state, and screening primary screening water quality indexes with detected numerical values;

collecting the detection data of the primary screening water quality index under the micro-flow state and the water body disturbance state respectively,

screening out a reference water quality index with a remarkably changed detected numerical value;

5. The method of claim 4, wherein the number of the key water quality indicators is not less than 50% of the number of the reference water quality indicators.

6. The method of claim 1, wherein the abatement facility comprises a photocatalytic mesh comprising a mesh frame and network of photocatalytic functional fibers secured to the mesh frame; the abatement facility also includes bio-ropes and a submerged plant tank attached to the photocatalytic network.

7. The method of claim 6, wherein the photocatalytic functional fiber comprises a polypropylene filament as a substrate and a carbon-based metal semiconductor coated on a surface of the polypropylene filament.

8. The method of claim 6, wherein the photocatalytic net is laid over an area of 20-40% of the area of the body of water to be treated; the photocatalytic net is laid in the central area of the water body to be treated; the paving position of the photocatalytic net is 5-20 cm away from the water surface; the photocatalytic net is fixed through a water-bottom pile or a water-bottom anchor block; the longitudinal axis of the photocatalytic net is parallel to the perennial main wind direction of the water surface.

9. The method of claim 6, wherein the remediation facility comprises a deep plug flow device adapted for use with a body of water to be remediated having a water depth greater than 4m.

10. The method of claim 1, wherein said determining that the trend of change of said key water quality purification factors deviates from a remediation goal and adjusting the configuration strategy of said remediation facility comprises:

11. The method of claim 10, wherein the management measures include at least one of:

patrolling the periphery of the water body to be treated at specified frequency;