LU102701B1 - Non point source pollution control system based on clean water network - Google Patents

Abstract

The invention discloses a non-point source pollution control system, which comprises the following components: rural residential area, primary tributary, secondary tributary and venous stream; farmland is set outside the rural residential area, low flow water body is set in the farmland and / or rural residential area, and farmland venous ditch is set in the farmland; There are several compound towers in rural residential areas; Primary tributaries, secondary tributaries and venous streams are used to collect water discharged from rural residential areas and farmland into lakes and / or rivers; Low flow water body is used for regional treatment of water body; farmland venous ditch is used to transfer surface runoff from farmland into primary tributaries, secondary tributaries and / or venous streams; Composite tower is used to treat sewage from rural residential areas and then transfer it into primary tributaries, secondary tributaries and / or venous streams.

Description

Description LU102701 Non point source pollution control system based on clean water network

TECHNICAL FIELD The invention relates to the technical field of non-point source pollution treatment and river water purification, in particular to a non-point source pollution control system based on clean water network.

BACKGROUND Freshwater resources are currently not only in short supply globally, but also severely imbalanced in distribution. By 2025, the world is expected to have up to 3 billion people with water shortages. To make matters worse, the current water shortage is accompanied by increasing global waste and pollution.

More than 200 years ago, with the beginning of the industrial revolution, productivity developed rapidly, but due to the lack of attention to the environment and the lack of protection, the pollution of freshwater resources spread to all corners of the world. Up to now, all major rivers in the world have been polluted to varying degrees. According to the World Water Development Report published by the United Nations, at least half of the world's 500 major rivers are severely depleted or polluted, and in China, surface source pollution is one of the main causes of water pollution in rivers and lakes.

Surface source pollution, also known as non-point source pollution, refers to dissolved and solid pollutants from non-specific locations, under the action of precipitation or snowmelt scouring, through the runoff process and into the receiving water bodies (including rivers, lakes, reservoirs and bays, etc.) and cause organic pollution, water eutrophication or toxic and harmful and other forms of pollution. According to the characteristics of the surface source pollution occurrence area and process, it is generally divided into two categories of urban and rural production and living, agricultural surface pollution. Compared with point source pollution, surface source pollution has the characteristics of wide, scattered, multiple and complex sources and pathways, therefore, surface source pollution control is more difficult. Compared with many developed countries, China's rural population base, agricultural fertilizers in large quantities, irrational use, the rapid development of rural scale livestock and poultry farming and other specific national conditions, decided that many areas of China's surface sources are the primary LU102701 source of pollution causing local water environmental problems.

For surface source pollution and natural water ecological restoration techniques, there are mainly physical, chemical and biological methods. The surface source of pollution is wide, scattered, disorderly and other characteristics, resulting in physical and chemical method limitations are relatively obvious; the current ecological restoration technology 1s mainly simple to take a single artificial wetland (mudflat shallow flow wetland, vertical flow wetland, etc.) or ecological floating island, etc, the lack of comprehensive ecological management means for different polluted water bodies, especially the lack of endogenous and exogenous integrated ecological management methods.

SUMMARY The purpose of the present invention is to provide a surface source pollution control system based on the clear flow water network to solve the technical problems in the prior art, so that the cost of controlling surface source pollution is low, ecological benefits are good, post maintenance is simple, and the effect is maintained for a long time, and ecological construction is achieved while safeguarding water quality.

To achieve the above purpose, the present invention provides the following solution: The present invention provides a surface source pollution control system based on the clear flow water network, which comprises the following components: Rural residential areas, primary tributaries, secondary tributaries and venous streams which surround and/or run through the rural residential areas, wherein the venous streams are connected with the secondary tributaries and the secondary tributaries are connected with the primary tributaries; Farmland is arranged at the periphery of the rural residential area, low-flow water bodies are arranged in the farmland and/or the rural residential area, and farmland venous stream are arranged in the farmland; The rural residential area is provided with a plurality of composite towers.

The primary tributary, the secondary tributary and the venous stream are used for converging the water discharged from the rural residential area and the farmland into the lake and / or river.

The low flow water body 1s used for regional treatment of water body.

The farmland venous stream is used to merge surface runoff in the farmland into the LU102701 primary tributary, secondary tributary and/or venous stream.

The composite tower 1s used to process the sewage generated in the rural residential area and then flow into the primary tributary, secondary tributary and/or venous stream.

Preferably, it also includes a plant buffer zone, which is used to further purify the water that flows into the primary tributary, secondary tributary and/or venous stream.

The plant buffer zone comprises an inland plant buffer zone and a riparian plant buffer zone; The inland plant buffer zone is arranged at the junction of the rural residential area and the primary tributary, the secondary tributary and/or the venous stream; The riparian plant buffer zone is arranged at the junction of the farmland and the primary tributary, the secondary tributary and/or the venous stream; The composite tower is connected with the inland plant buffer zone, and the farmland venous stream is connected with the riparian plant buffer zone.

Preferably, a plurality of composite ecological revetments are arranged on the riverbanks of the primary tributaries, and the positions of the composite ecological revetments correspond to the positions of the riparian plant buffer zones.

Preferably, the inland plant buffer zone adopts one or more of surface flow constructed wetland, horizontal subsurface flow constructed wetland and vertical flow constructed wetland.

Preferably, the vertical flow constructed wetland has an inclination of 2%.

Preferably, the riparian plant buffer zone has mosaic of longitudinal space, transition of transverse space, layering of vertical space and dynamic of time distribution.

Preferably, the secondary tributary is internally provided with a water body in-situ restoration area and an ecological infiltration dam.

Preferably, the low-flow water body comprises one or more of ponds, puddles and broken river banks; The low-flow water body adopts one or more of ecological oxidation pond technology and river course restoration technology based on ecological space construction.

Preferably, the composite tower adopts a composite tower ecological filter, which comprises an anaerobic filter, and an anaerobic filter material is arranged in the anaerobic filter.

Preferably, the anaerobic filter materials are granular filter materials with different LU102701 gradations.

The invention discloses the following technical effects: (1) The invention combines source pollution control with ecological construction, not only purifies pollutants, but also meets people's higher level ecological environment demand in beautiful township construction; The "clean water network" technology provided by the invention realizes the whole process control of water pollution in the basin, and strengthens the key areas; at the same time, the water body has strong self purification function and maintenance ability, the main ecological service function 1s better, and the water quality is guaranteed, which brings the ecological characteristic landscape of human and nature integration.

(2) According to the invention, natural regulation and artificial regulation are combined, wherein only aquatic animals, aquatic plants and other aquatic organisms will be monitored, while the damaged ecological system will not be further affected. The method has the advantages of low cost, good ecological benefit, simple later maintenance, long effect maintenance time and the like. This combines the purification ability of plants with landscape effect. While meeting the requirements of water purification, constructing waterfront landscape by plants can give full play to the functionality and economy of water ecosystem, improve local social and economic benefits, and expand the comprehensive service function of water resources to meet the sustainable development of water resources and environment.

BRIEF DESCRIPTION OF THE FIGURES In order to explain the embodiments of the present invention or the technical scheme in the prior art more clearly, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in the field, other drawings can be obtained according to these drawings without paying creative labor.

Fig. 1 is the schematic structural diagram of a non-point source pollution control system based on clean water network of the present invention.

Signs: 1: low flowing water body, 2: inland plant buffer zone, 3: farmland, 4: water inlet, 5: outflow direction of farmland venous stream, 6: farmland venous stream, 7:

riparian plant buffer zone, 8: composite ecological revetments, 9: rural residential area, 10: LU102701 composite tower, 11: outflow direction of compound tower, 12: venous stream, 13: secondary tributary, 14: water body in-situ restoration area, 15: ecological infiltration dam, 16: primary tributary, 17: riverbank line.

DESCRIPTION OF THE INVENTION The technical scheme in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative labor belong to the scope of protection of the present invention.

In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the present invention will be further explained in detail with reference to the accompanying drawings and specific embodiments.

Referring to Figure 1, this embodiment provides a surface source pollution control system based on a clear flow water network, comprising: a rural settlement 9, a primary tributary 16, secondary tributaries 13, venous streams 12, and plant buffer zones. The primary tributary 16, the secondary tributary 13, and the venous stream 12 surrounding and/or running through said rural settlement 9. The venous stream 12 connected to the secondary tributary 13, the secondary tributary 13 1s connected to said primary tributary 16; The rural settlement 9 is surrounded by farmlands 3, the farmlands 3 and/or said rural settlement 9 contains a low flow water body 1, the agricultural fields 3 contains an farmland venous streams 6; the rural settlement 9 1s provided with a number of composite towers 10.

The primary tributary 16, the secondary tributary 13, and the venous stream 12 are used to transfer the water discharged from the rural residential area 9 and the farmland 3 into lakes and/or rivers.

The low-flow water body 1 is used for regionalization treatment of the water body.

The farmland venous stream 6 is used for converging the surface runoff in the farmland 3 into the primary tributary 16, the secondary tributary 13 and / or the venous stream 12.

The composite tower 10 is used for treating the sewage generated by the rural LU102701 residential area 9 and then flowing into the primary tributary 16, the secondary tributary 13 and / or the venous stream 12.

The plant buffer zone is used for further purifying the water flowing into the primary tributary 16, the secondary tributary 13 and / or the venous stream 12.

The plant buffer zone comprises an inland plant buffer zone 2 and a riparian plant buffer zone 7; The inland plant buffer zone 2 is arranged at the junction of the rural residential area 9 and the primary tributary 16, the secondary tributary 13 and/or the venous stream 12; The riparian plant buffer zone 7 is arranged at the junction of the farmland 3 and the primary tributary 16, the secondary tributary 13 and/or the venous stream 12; The composite tower 10 is connected with the inland plant buffer zone 2, and the farmland venous stream 6 is connected with the riparian plant buffer zone 7.

A plurality of composite ecological revetments 8 are arranged on the riverbank line 17 of the primary tributary 16, and the positions of the composite ecological revetments 8 correspond to the positions of the riparian plant buffer zones 7.

The secondary tributary 13 is provided with a water body in-situ repair area 14 and an ecological percolation dam 15.

The low flowing water body 1 includes but is not limited to the ponds, puddles, guillotine and other water bodies with poor liquidity distributed in rural residential areas 9 or farmland 3; the low flow water body 1 adopts one or more of ecological oxidation pond technology and river restoration technology based on ecological space to realize regional treatment of water body.

The inland plant buffer zone 2 is a local dominant species, which follows the local priority in the process of species selection and has better removal effect on nitrogen and phosphorus nutrients and antibiotics in water body, such as reed, Acorus calamus, low shrubs, etc. The inland plant buffer zone 2 is a constructed wetland, and the constructed wetland adopts one or more of surface flow constructed wetland, horizontal subsurface flow constructed wetland and vertical flow constructed wetland. The removal efficiency of organic matter by constructed wetland is related to the residence time of the system, the quality of the influent water and other factors. 1) The water surface of surface flow constructed wetland is located above the substrate of constructed wetland, and its water depth is generally 0.20-0.40m. In this type of constructed wetland, the sewage flows slowly LU102701 through the surface of the constructed wetland at a certain depth from the inlet, part of the sewage evaporates or seeps into the constructed wetland, and the effluent flows out through the overflow weir. The treatment of wastewater is a comprehensive result of the interaction of physical, chemical and biological processes among plants, substrates and internal microorganisms. In particular, the wide contact area and long residence time make the removal effect of suspended solids and organic matter better.

In addition, it allows algae, submerged macrophytes and floating leaf plants to grow on the surface of free water, which obviously has higher photosynthetic activity than emergent macrophytes, thus producing more and indirectly transferring from the water, making the water alkaline, resulting in a sharp drop in phosphate concentration and ammonia volatilization; The substrate surface of the surface flow wetland formed by sediment and plant dead leaves also provides additional carbon source for denitrification, so the removal of total nitrogen can be carried out stably. But in general, the removal rate of nutrients and nutrients is low. 2) The horizontal subsurface flow constructed wetland has many action sites, abundant microorganisms, small internal temperature fluctuation, strong load and impact resistance, small land occupation and high pollutant removal efficiency. Compared with the traditional wastewater treatment technologies, the removal efficiency of BODS, CODcr and SS is higher, but the removal efficiency of N and P is slightly lower. 3) While maintaining the removal efficiency of CODS, CODer and SS, the removal efficiency of nitrogen and phosphorus was also greatly enhanced. In order to better oxygenate the system, the vertical flow followed by intermittent inflow, usually for 6 hours. The inflow load is between 30mm and 40mm per unit area, which increases the oxygen content in the wetland system. In order to prevent system blocking and facilitate drainage, the vertical flow wetland has an inclination of about 2%.

The riparian plant buffer zone 7 is set up between the non-point source pollution area and the receiving water body, which is covered by forest, grass or wetland plants, and has an important influence on the ecological and hydrological process of the riparian ecosystem, and has four-dimensional spatial structure characteristics, namely, it has edge characteristics such as mosaic of vertical space, transition of horizontal space, layering of vertical space and dynamic of time distribution. The eco-hydrological functions of LU102701 ecological buffer zone are mainly reflected in controlling river bank erosion, intercepting surface runoff sediment and nutrients in catchment area, protecting and purifying water quality of rivers and streams, regulating regional microclimate, maintaining the circulation of carbon, nitrogen and phosphorus, providing habitats for aquatic animals and plants, providing a good environment for people's leisure and tourism, increasing biodiversity and maintaining ecosystem integrity, etc. The riparian ecological buffer zone can realize the interception and transformation of nitrogen through the processes of infiltration and deposition of nitrogen from surface runoff, absorption and storage of plants, fixation of organic nitrogen by microorganisms and storage in soil, and transformation of nitrite nitrogen into gaseous nitrogen by denitrification. Li Huaien's research on Xiaohuashan Reservoir in Shaanxi Province shows that the reduction rates of particulate nitrogen, particulate phosphorus, total nitrogen, total phosphorus and chemical oxygen demand in surface runoff are 82.02%, 77.13%, 46.05%, 73.28% and 60.48% respectively, and the load of dissolved nitrogen and phosphorus can be effectively reduced. Haycock's research on the width of buffer zone shows that the buffer zone with 5m width can intercept most coarse sediment, and when it is larger than 10m, the overall interception rate of sediment and total phosphorus reaches over 80% and 50%, and the decontamination effect increases with the increase of buffer zone width. Therefore, planting natural aquatic plants such as reeds and cattail along the river flow direction without affecting the normal drainage of the river can not only ensure the stability of the soil channel slope, but also play a certain role in intercepting and reducing the farmland nitrogen flowing into the ditch.

The farmland 3 is regular or irregular farmland.

The farmland venous stream 6 is the only channel through which agricultural surface runoff flows into lakes and rivers. The farmland venous stream 6 adopts a unique plant- sediment-microorganism system, which can reduce the concentration of nitrogen and phosphorus carried by surface runoff to a certain extent through physical and chemical actions such as plant absorption, sediment interception and microbial decomposition. The aquatic plants in the farmland venous stream 6 play an important role in the removal of nitrogen and phosphorus in water. Besides the plants directly absorb nitrogen and phosphorus in water or sediment, the existence of plants can also prolong the stay time of water in the ditch and provide a powerful growth environment for microorganisms. LU102701 Ecological ditch can also be regarded as a form of constructed wetland, and its pollutant removal mechanism is similar to that of constructed wetland. While filtering, treating and purifying the non-point source pollution collected from the catchment area, it can also play the role of transporting water flow. Usually, constructed wetlands can be arranged at the end to form a non-point source pollution treatment system.

The farmland venous stream 6 is provided with a plurality of water inlets 4, and the water treated by the farmland venous stream 6 flows into the vegetation buffer zone through the water inlets 4, and then flows into the primary tributary 16, the secondary tributary 13 and the venous stream 12 through the vegetation buffer zone.

Plants in constructed wetlands alternately conduct photoreaction and dark reaction of photosynthesis, and the amount of oxygen transported by root hair appears alternately, as well as the difference in oxygen consumption in different regions within the system, resulting in the alternation of anaerobic and aerobic states in the system, which is equivalent to multiple series or parallel sewage treatment units, so that nitrification and denitrification can be carried out simultaneously and continuously in the wetland system. So constructed wetland has stronger nitrogen removal efficiency than general urban sewage treatment system. On the other hand, phosphorus can be removed through the normal assimilation and absorption of phosphorus by microorganisms and the excessive accumulation of phosphorus accumulating bacteria, and the filler can be replaced to achieve the purpose of phosphorus removal. When the influent phosphorus content is 10ml / L, the normal assimilation and absorption of phosphorus by microorganisms can only remove 4.5 % -19 % of the total phosphorus in the influent. The filler used in slope 8 is generally cinder, ceramsite, river sand and so on. When the wastewater flows slowly through the constructed wetland, adsorption, filtration, precipitation and ion exchange reactions occur on the surface of the filler, so that most of the phosphorus in the wastewater is removed. Among them, soluble phosphates can exchange with cations such as Al“, Mg", Ca” in the constructed wetland filler to form insoluble phosphates, which can precipitate on the surface of the filler.

The composite ecological slope protection 8 integrates a protection engineering technology of ecological concept, so it has both ecological service function and engineering protection function. Its ecological service function is mainly realized by interception, LU102701 transpiration and infiltration of canopy, dry layer, surface, litter layer and underground root layer of vegetation. Its engineering protection function is mainly to reduce pore water pressure of slope, weaken splash erosion and erosion, and inhibit soil erosion on slope; It can prevent the bank slope temperature from changing too sharply and stabilize the water temperature. With the reinforcement of root system, the migration resistance of soil can be increased, and the resistance of soil layer to slope slip can be improved, thus improving slope stability and preventing soil erosion. Composite ecological slope protection 8 is one of the important technologies for ecological reconstruction of revetment. It refers to the transitional zone between water body and terrestrial ecosystem until the influence of river water disappears. It is an ecological transitional zone for exchanging material, energy and information between river ecosystem and terrestrial ecosystem, with obvious marginal effect and unique ecological process. It is a special component of landscape pattern, a green ecological corridor, and a very important ecological transition zone in the Earth's biosphere. It has obvious edge effect, including boundary and gradient, and is mostly distributed in strips, which are generally located in rivers, lakes and other water environments. Its heterogeneous environment provides sufficient breeding, growth and hiding places for living things. At the same time, the alternating conditions of dry and wet bring about the alternation of oxidation-reduction potential in soil and the cycle alternation of microbial communities with different properties, which provides favorable conditions for the degradation and decay of organic matter, the interception, deposition and transformation of nutrients, and has the functions of resisting floods, regulating runoff, maintaining water and soil, storing floods and resisting drought, etc.

The rural residential area 9 is scattered with rural residents, and the technical facilities are relatively imperfect, such as no sewage treatment plant and pipeline collection equipment, etc.

The composite tower 10 adopts a composite tower-type ecological filter, which includes a high-level water distribution anaerobic filter. The high-level water distribution anaerobic filter is equipped with high-strength nylon coated anaerobic filter materials with convex and concave surface distribution. The anaerobic filter materials are granular filter materials with different gradations. In the sewage treatment process, COD, SS and part of nitrogen and phosphorus are further intercepted and removed by utilizing the adsorption of LU102701 filter materials and the synergistic effect of microorganisms. The composite tower ecological filter adopts intermittent water inlet, which is beneficial to the endogenous digestion of microorganisms in the ecological filter and reduces the amount of sludge produced, and the composite tower ecological filter basically does not discharge sludge.

The venous stream 12 is a smaller stream or ditch before entering the secondary tributary 13.

The secondary tributary 13 is a river flowing into the primary tributary 16.

The first tributary 16 is the main river or the main tributary into the lake; The amount of water in the venous stream 12, the secondary tributary 13 and the primary tributary 16 increases in turn.

The water body in-situ restoration area 14 adopts the following technologies: 1 ) Sediment deep trough-shoal sequence technology. The deep trough-shoal sequence technology is used to form the concave bank and convex bank with the alternation of deep and shallow, namely, the deep trough and shoal. In addition to the increased turbulence in shoals promoting the flow to strengthen aeration, the bottom of convex segment also becomes the main habitat for many aquatic invertebrates, and 1s the place and protected area for fish to feed. Deep tanks are also protected areas for fish and storage areas for organic matter slowly released into the water. Because deep grooves and shoals can produce a variety of flow conditions such as jet flow and slow flow, which are suitable for different biological development and growth needs, rich biological communities are formed and biodiversity is improved.

2) Zooplankton community algae control technology, advanced technology of Daphnia magna guided water ecology restoration. Using domesticated Daphnia magna to remove algae, eat decaying debris, eat bacteria, degrade organic pollutants, improve water transparency, and absorb nitrogen and phosphorus through underwater forests and lawns, adsorb sediment, inhibit water wars, and further clear the water body, and then promote biological manipulation to regulate the food chain by planting aquatic plants and placing aquatic animals to convert plant proteins into animal proteins, forming water body self- purification and enhancing the efficient self-purification ability of water body.

3) Aquatic plant community restoration and purification technology. Aquatic plants LU102701 absorb and assimilate a variety of elements essential to plants such as nitrogen and phosphorus during growth, and have a strong ability to purify water bodies. Using anti- pollution frontier aquatic plants (pioneer species of water plants), nutrient predatory and ornamental submerged plants, winter anti-pollution submerged plants, water body edge landscape plants, ornamental plants and water plants, these plants carry out photosynthesis, improve dissolved oxygen, effectively improve biological activity, form suitable habitats for a variety of aquatic animals, increase biodiversity, and purify water quality through chemosensory effects. The program also takes into account the temporal and spatial changes, and scientifically configures the overwintering aquatic plants that have ecological effects on water quality to ensure that aquatic plants have efficient purification capacity for water bodies throughout the year. Aquatic plants provide colorful environmental conditions for the habitat and reproduction of fish, birds and other aquatic animals, and have a strong environmental ecological function, improving the microenvironment also has an obvious role.

4) Aquatic animal symbiosis system construction technology. The use of local waters to survive native species, scientific and reasonable design of aquatic animal growth patterns (species, number, density, age, male to female ratio, individual size, food habits, habits, stocking season, stocking order, disease control, people's activities, etc.), which can not only purify the water body, enhance ornamental, but also improve the food chain, and the formation of a balanced water ecosystem. Also configured to withstand low temperatures overwintering aquatic animals, but also able to reflect the indicative biological species of fish, shrimp and shellfish. In this embodiment, 35g to 45g of bighead carp per cubic meter of water can effectively control the water, and for every 1000kg increase in weight of fish, an average of 26kg of nitrogen and 1.6kg of phosphorus can be removed, which can effectively purify the water quality of the water body.

5) Benthic animal regulation technology. According to the characteristics of the watershed, the aquatic benthos is scientifically and reasonably stocked to improve the food chain, promote organic matter decomposition, accelerate the self-purification process and substrate decomposition. And it can also reduce the release of endogenous pollution, reduce the sedimentation rate of river water, stabilize the physical and chemical properties of the substrate, maintain the health of the water system, and further establish a diverse biological LU102701 community. The premise of stocking is based on the establishment of aquatic vegetation, water transparency, plankton biomass and other basic indicators to determine the species of stocked aquatic benthic animals and their density.

6) Indigenous microbial cultivation technology. This is essential for protecting the ecological safety of the public environment, safeguarding human health and safety, reflecting indigenousness, safety, avoiding foreign microbial agents from damaging the natural micro-ecosystem, and preventing causing imbalance in the entire open water ecosystem and potential ecological hazards to the existing environment. By collecting river native mud samples, through the process of laboratory separation and purification, the tolerant microbial strains of river sewage are separated, and then the separated and purified tolerant strains are verified for the decomposition ability of water pollutants and reproduction ability observation one by one, the indigenous microorganisms with strong pollution tolerance and purification ability and limited self-propagation are selected, and the microbial broth with strong environmental adaptability and no ecological risk is expanded and cultured. Putting the cultured bacterium solution into the project water body, through the surface attachment of plants, ecological substrates and other substances, guiding the indigenous microorganisms to efficiently and steadily establish an organic system of interconnection and interaction with the environmental system where they are located, giving full play to the role of indigenous microorganisms, increasing the decomposition and mineralization of organic matter in water, which can prevent foreign ecological invasion and protect the ecological environment of public waters, in line with the world's microbial bacteriological agents in It can prevent the invasion of foreign ecology and protect the ecological environment of public waters.

7) Solar aeration system. The aeration system technology used is solar DC pump technology, i.e. solar water circulation purification technology. The most prominent feature of the solar aeration system is that it uses solar energy to enable the upper and lower water bodies to exchange, thus achieving the effect of disturbing the static water body, increasing the mobility of the water body and purifying the water quality.

8) Application technology of ecological substrate (ecological film covering). Textile fabrics (with less strength reduction and long service life when immersed in water) or geotextiles (with strong toughness and good isolation effect) are selected as membrane LU102701 materials. Calcite (particle size < 100 mesh) and zeolite (particle size of zeolite 1-2 mm) are the main covering materials; And the modified ceramsite and gravel powder are used as passivation materials (particle size < 100 mesh). Ecological film covering consists of surface layer (textile), calcite-modified ceramsite layer, filter layer (geotextile), zeolite- modified gravel layer and foundation cushion layer (geotextile) from top to bottom. Ecological film covering function: (1) The polluted sediment is physically separated from the upper water body through the covering layer; (2) Covering can stabilize the polluted sediment and prevent it from resuspension or migration; (3) Through the adsorption of organic particles in the cover, pollutants such as heavy metals and organic matter in the polluted sediment can be effectively reduced from entering the upper water body; (4) Filler particles can provide space for the adsorption and growth of microorganisms, enhance the degradation function of microorganisms and reduce pollutants. At the same time, PCBs, PAHs and heavy metals in the sediment can be effectively prevented from entering the water body through the membrane covering, which can obviously improve the water quality.

The ecological infiltration dam 15 is a combination of the dam and biotechnology, which has the function of filtering water and purifying water, and can absorb more microorganisms inside the ecological infiltration dam 15, which is beneficial to the degradation of microorganisms.

The above embodiments only describe the preferred mode of the invention, but do not limit the scope of the invention. On the premise of not departing from the design spirit of the invention, various modifications and improvements made by ordinary technicians in the field to the technical scheme of the invention shall fall within the protection scope determined by the claims of the invention.

Claims (10)

CLAIMS: LU102701

1. A non-point source pollution control system based on clear water network is characterized by comprising a rural residential area (9), a primary tributary (16), secondary tributaries (13) and venous streams (12), wherein the primary tributary (16), the secondary tributary (13) and the venous stream (12) surround and/or run through the rural residential area (9); the venous streams (12) are connected with the secondary tributary (13), and the secondary tributaries (13) are connected with the primary tributary (16); farmlands (3) are arranged outside the rural residential area (9), a low flow water body (1) is arranged in the farmland (3) and / or the rural residential area (9), and farmland venous ditches (6) are arranged in the farmland (3); the rural residential area (9) is provided with a plurality of composite towers (10); the primary tributary (16), the secondary tributary (13) and the venous stream (12) are used for converging the water discharged from the rural residential area (9) and the farmland (3) into the lake and / or river; the low-flow water body (1) is used for regionalization treatment of the water body; the farmland venous ditch (6) is used to merge surface runoff in the farmland (3) into the primary tributary (16), secondary tributary (13) and/or venous stream (12); the composite tower (10) is used for treating the sewage generated by the rural residential area (9) and then flowing into the primary tributary (16), the secondary tributary (13) and / or the venous stream (12);

2. The non-point source pollution control system based on clean water network according to claim 1, which is characterized in that it also includes a plant buffer zone for further purifying the water flowing into the primary tributary (16), the secondary tributary (13) and / or the venous stream (12); the plant buffer zone comprises an inland plant buffer zone (2) and a riparian plant buffer zone (7), and the inland plant buffer zone (2) is arranged at the junction of the rural residential area (9) and the primary tributary (16), the secondary tributary (13) and / or the venous stream (12); the riparian plant buffer zone (7) is arranged at the junction of the farmland (3) and the primary tributary (16), the secondary tributary (13) and / or the venous stream (12); the composite tower (10) is connected with the inland plant buffer zone (2), and the farmland venous ditch (6) is connected with the riparian plant buffer zone (7);

3. The non-point source pollution control system based on clean water network LU102701 according to claim 2, which is characterized in that a plurality of composite ecological revetments (8) are arranged on the riverbank line (17) of the primary tributary (16), and the positions of the composite ecological revetments (8) correspond to the positions of the riparian plant buffer zones (7).

4. The non-point source pollution control system based on clean water network according to claim 2, which is characterized in that the inland plant buffer zone (2) adopts one or more of surface flow constructed wetland, horizontal subsurface flow constructed wetland and vertical flow constructed wetland.

5. The non-point source pollution control system based on clean water network according to claim 4 is characterized in that the vertical flow constructed wetland has an inclination of 2%.

6. The non-point source pollution control system based on clean water network according to claim 2, which is characterized in that the riparian plant buffer zone (7) has the mosaic of vertical space, the transition of horizontal space, the layering of vertical space and the dynamic of time distribution.

7. The non-point source pollution control system based on clean water network according to claim 1, which is characterized in that a water body in-situ restoration area (14) and an ecological infiltration dam (15) are arranged in the secondary tributary (13).

8. The non-point source pollution control system based on clean water network according to claim 1, which is characterized in that the low-flow water body (1) comprises one or more of ponds, puddles and broken creeks; the low-flow water body (1) adopts one or more of ecological oxidation pond technology and river course restoration technology based on ecological space construction.

9. The non-point source pollution control system based on clean water network according to claim 1 is characterized in that the composite tower (10) adopts a composite tower ecological filter, which comprises an anaerobic filter, and an anaerobic filter material is arranged in the anaerobic filter.

10. The non-point source pollution control system based on clean water network according to claim 9, which is characterized in that the anaerobic filter materials are granular filter materials with different gradations.