CN101723520B - Method for cutting low-pollution water load of venous riverway - Google Patents

Abstract

The invention discloses a method for reducing the low-pollution water load of venous rivers, and belongs to the field of water treatment. The steps are: (1) construct venous channels by using abandoned channels or low-lying near-natural channels; (2) set up ecological floating islands and shore restoration belts in the upstream of the venous channels according to the direction of water flow; (3) build venous channels upstream (4) Set up a submerged ecological bed and a biological contact oxidation bed in the middle reaches of the venous river; (5) Set up an ecological permeable dam between the middle and downstream of the venous river; (6) Set up an ecological permeable dam between the middle and downstream of the venous river; Ecological floating islands and shore restoration belts are set downstream. Through the application of the invention, the removal rates of COD, ammonia nitrogen, total nitrogen and SS in venous channels can reach more than 60%. Finally, the venous channel can achieve better ecological and landscape effects. Realize the integration of river channel functionality, ecology, and landscape, achieve the governance effect of "clear water, green banks, and beautiful scenery", and provide guarantee for the improvement of water quality in river network areas.

Description

Method for reducing water load of low pollution in venous river

technical field

The invention relates to a water body pollution control method, more specifically a method for reducing the low-pollution water load of venous rivers.

Background technique

Sewage treatment is to use various methods to separate the pollutants contained in the sewage, or to convert them into harmless and stable substances, so that the sewage can be purified. Modern sewage treatment technology can be divided into physical method, chemical method and biological method according to its working principle. (1) The physical treatment method mainly uses methods such as filtration, sedimentation, and flotation to remove suspended solids. (2) Chemical treatment methods include neutralization, oxidation, chemical coagulation, electrolytic coagulation, ion exchange and other methods. Neutralization makes the pH value of the waste liquid close to neutral. Oxidation method is to use air or oxidant to oxidize organic substances in wastewater into harmless substances. Chemical coagulation is the use of aluminum sulfate, ferric chloride and other substances to make the colloids in the wastewater precipitate into flocs. Ion exchange method is to use ion exchange resin to separate heavy metal ions from wastewater. Then rinse the resin with an acid solution to wash out the heavy metals and regenerate the resin. (3) The biological treatment method uses the biochemical action in the process of microbial life movement to decompose and transform harmful organic matter into harmless simple substances, so as to achieve the purpose of wastewater purification. There are many kinds of pollutants in domestic sewage and industrial sewage, and it cannot be expected that all pollutants can be removed by only one method. A kind of sewage often needs to be treated by a treatment system composed of several methods. in order to achieve the required level of treatment. According to the degree of treatment, sewage treatment can be divided into primary treatment, secondary treatment, and tertiary treatment. Primary treatment is also called pretreatment, and its content is to remove floating substances and some suspended pollutants in sewage, and adjust the pH value , to reduce the degree of corrosion of sewage and the load of subsequent treatment processes. Most of the physical methods can only meet the requirements of primary treatment. Secondary treatment is also called biochemical treatment. The main task is to greatly remove the colloidal and Organic pollutants in dissolved state. The tertiary treatment is advanced treatment, which uses physical, chemical and chemical methods to make the water quality meet the water use requirements.

Since the 1990s, the state has focused on the "three rivers and three lakes" (Huaihe River, Liaohe River, Haihe River, Taihu Lake, Chaohu Lake, and Dianchi Lake), the Three Gorges reservoir area, and along the South-to-North Water Diversion Basin, and adopted a series of measures to prevent and control water pollution in the basin. . After years of hard work, the deterioration of water pollution in my country's river basins has basically been curbed and the quality of the water environment has improved. However, the water environment situation is still not optimistic.

First of all, the water quality situation has not fundamentally improved, and the water pollution situation is still quite serious. In 2006, the overall quality of surface water in the country was moderately polluted. Among the 745 surface water monitoring sections actually monitored by the National Environmental Monitoring Network (referred to as the State Control Network), the grades I to III (excellent and good), grades IV and V (slight and moderate pollution), and grade V (severely polluted) Pollution) water quality sections accounted for 40%, 32% and 28% respectively. 90% of the river sections flowing through the city are polluted to varying degrees, among which the Songhua River, Yellow River, and Huaihe River are moderately polluted, and Liaohe River and Haihe River are severely polluted; 75% of the lakes are eutrophic, and the water quality of Chaohu Lake is Class V. Taihu Lake and Dianchi Lake are inferior to Class V; in addition, the water quality of drinking water sources in 30% of key cities does not meet Class III standards.

Secondly, the total amount of pollutant discharge is large, far exceeding the environmental capacity that the river basin can bear. During the "Tenth Five-Year Plan" period, my country's wastewater discharge increased from 41.52 billion tons in 2000 to 52.45 billion tons in 2005, an increase of 8.7%; Complete the "Tenth Five-Year" plan to reduce emissions by 10%. The national "Eleventh Five-Year Plan" outline proposes that COD emissions should be reduced by 10% during the "Eleventh Five-Year Plan" period as a binding target. However, in 2006, national chemical oxygen demand emissions increased by 1.0% compared with 2005, rising instead of decreasing. After hard work, the national COD emissions in the first three quarters of 2007 fell by 0.28% year-on-year, turning from rising to falling for the first time. However, the task of reducing emissions by 10% during the "Eleventh Five-Year Plan" period is still an arduous task.

Third, severe water pollution not only aggravates the shortage of water resources and destroys the aquatic ecosystem, but also affects people's normal production and life, posing a threat to the sustainable development of my country's economy and society. One is that the increasingly serious water pollution has exacerbated the shortage of water resources. Due to water pollution, the originally rich river water resources can not be used, but also require a lot of manpower and material resources for remediation, which makes the northern regions and cities that were short of water even more water-scarce, and makes the southern regions and cities rich in water resources Guarding the rivers and lakes but not being able to obtain clean water that meets the standards has formed the so-called water quality-based water shortage, which has become a bottleneck restricting the sound and rapid development of the economy and society. The second is the over-exploitation of water resources and the destruction of water ecosystems. The internationally recognized water resource utilization rate warning line for river basins is 30% to 40%, but the water resource utilization rate of most rivers in my country has exceeded this warning line, such as 60% for the Huaihe River, 62% for the Yellow River, 65% for the Liaohe River, and more than 65% for the Haihe River. 90%. The excessive development and utilization of water resources and the channelization and fragmentation of river systems have resulted in the continuous decline of flood storage capacity, pollutant purification capacity, and aquatic organism production capacity, which have caused varying degrees of damage to my country's aquatic systems. Third, water pollution poses a threat to people's drinking water safety and health. Nearly 90% of urban drinking water sources in my country have been threatened by urban sewage, industrial wastewater and agricultural drainage. Causing varying degrees of drinking water crises in many places. Obvious public hazards such as lead poisoning, cadmium poisoning, and mercury poisoning have appeared in Guizhou and Yunnan; the incidence of cancer in many areas of the Huaihe River Basin is ten to hundreds of times higher than normal areas, seriously affecting the health of local residents and life.

Contents of the invention

1. The technical problem to be solved by the invention

Aiming at the problem that the pollution of the existing river water body is aggravated and difficult to deal with, the present invention provides a method for reducing the low-pollution water load of venous rivers, using submerged ecological bed technology, biological contact oxidation technology, ecological floating island technology and ecological transparent Dams, this method can solve the pollution problem of venous channels in the river network area of the basin, and effectively remove pollutants such as nitrogen and phosphorus in sewage.

2. Technical solution

For solving above technical problem, principle of the present invention is:

According to the characteristics of the venous river, the functions of each core technology, the management goal of the venous river, and the ecological landscape effect to be achieved, the technical solution of the present invention is: the bank restoration on both sides of the upstream of the river can better fix the bank slope and intercept the sewage. Effectively reduce the inflow of non-point source sewage and domestic sewage. The ecological floating island technology is adopted in the river channel to strengthen the removal of nitrogen and phosphorus in the upstream river channel through the ecological floating island plant-immobilized nitrogen cycle bacteria and microorganism mutual beneficial symbiosis system. At the same time, the ecological floating island and the shore Restoration plants together create a harmonious ecological landscape. The ecological permeable dam is set between the upstream and the middle reaches. The roots of the plants planted on the surface of the permeable dam provide habitats for microorganisms and at the same time provide oxygen for microorganisms, which helps to promote the absorption and transformation of nutrients such as N and P. Set up a submerged ecological bed in the middle reaches of the river, use the absorption of plants to remove pollutants such as nitrogen and phosphorus in the sewage, and then set up biological contact oxidation to oxidize the organic matter in the sewage and the plant residues in the middle and upper reaches of the river through biological oxidation break down. The plants in the submerged ecological bed will decompose and rot into the water, so the biological contact oxidation is arranged after the submerged ecological bed. Set up an ecological permeable dam before the downstream of the river to further effectively remove residual COD, TN, and TP. The water quality in the lower reaches of the river has basically reached the surface water standard. Setting up ecological floating islands has two functions: one is to further purify the water quality of the river, and the other is to beautify the river environment and achieve better ecological and landscape effects. Setting up shore restoration can maintain water and soil, combined with the ecological system composed of ecological floating islands, to achieve the effect of "clear water, green shore and beautiful scenery". Through the comprehensive application of key technologies for reducing the low-pollution water load of venous rivers, a key technology system for reducing venous rivers' low-pollution water loads has been formed, which is "one river, two-layer filtration, triple treatment, and four core technologies", and finally realizes the functionality of venous rivers. The combination of ecology and landscape.

Technical scheme of the present invention is:

The method for reducing the low-pollution water load of venous rivers, the steps are:

(1) Construct venous channels by using abandoned channels or low-lying near-natural channels,

(2) Set up ecological floating islands and shore restoration belts in the upstream according to the direction of water flow in the venous river;

(3) Set up an ecological permeable dam between the upper and middle reaches of the venous river;

(4) Set up a submerged ecological bed and a biological contact oxidation bed in the middle reaches of the venous channel;

(5) Set up an ecological permeable dam between the middle and lower reaches of the venous river;

(6) Set up ecological floating islands and shore restoration belts in the lower reaches of the venous river.

After the river sewage has undergone the above ecological treatment in sequence, the purpose of water quality improvement can be finally achieved.

(1) Ecological floating island

Collect, domesticate, and screen efficient denitrification bacteria in diving lake water, including ammonifying bacteria, nitrifying bacteria, nitrosifying bacteria and denitrifying bacteria; prepare micro-ecological types suitable for microbial growth, biocompatibility, and environmental harmony Immobilized carrier; use high-tech to immobilize the screened high-efficiency nitrogen cycle bacteria on a biocompatible carrier to prepare immobilized high-efficiency denitrification bacteria (ammonification, nitrification, nitrosation, denitrification bacteria); use ecological floating island The technology integrates with immobilized nitrogen cycle bacteria technology to purify venous river water, and establishes an ecological floating island plant-immobilized nitrogen cycle bacteria and microorganism mutual beneficial symbiosis system to strengthen the removal of nitrogen and phosphorus in lakes and rivers.

Comprehensively considering the comprehensive factors such as the purification effect of aquatic plants, growing season, survival difficulty, indigenous species, landscape effect, follow-up management, long-term management, and monitoring results of nutrients in water bodies, the treatment effect of TN, ammonia nitrogen, and total phosphorus is selected to be good. At the same time, choose the combination of emergent plants, submerged plants and floating plants to build an ecological floating island. Aquatic plants with better removal effect on TP include: black algae and bitter grass in submerged plants; Spinach. Among the plants with better removal effect on ammonia nitrogen, submerged plants include black algae, hornwort, bitter grass, and charophytes; emergent plants include reed, cattail, calamus, water onion, wild rice stem, taro, arrowroot, water chestnut, lotus root, floating water Plants include water lily, duckweed, water spinach, water chestnut, Yujiuhua, water lily, and terrestrial plants include canna and dry umbrella grass, among which water lily and duckweed are the best. Water lily and duckweed have the best effect .

Ecological floating islands can not only effectively remove nutrients such as nitrogen and phosphorus, greatly improve the transparency of water bodies, but also effectively improve water quality indicators, especially have a good inhibitory effect on algae. Floating island plants not only create the landscape of the water surface, but also absorb the surrounding CO ₂ and release O ₂ during photosynthesis, and at the same time purify the air; plants have transpiration during the growth process, and transpiration adjusts the ambient temperature through the plant stomata to evaporate water . Therefore, the photosynthesis and transpiration of ecological floating island plants regulate the microclimate of the water surface, and this good microclimate is suitable for the habitat of birds and the like. Due to the sunshade effect and vortex effect of the floating island, good conditions for fish survival are created.

(2) Submerged ecological bed

Submerged ecological bed technology is a technology that uses submerged ecological bed to treat water pollution in rivers, lakes and reservoirs. The submerged ecological bed includes a buoyancy adjustment device, an anchoring device, a submerged plant bed, a microbial bed, an aeration device, and a microporous aeration tube. The upper part of the submerged ecological bed is a submerged plant bed, and the lower part is a removable Microporous aeration system is installed at the bottom of the submerged bed, the top of the submerged bed is a buoyancy adjustment device, and the bottom is an anchoring device. The submerged ecological bed can adjust the water depth according to the species of aquatic plants planted, and is suitable for the growth of emergent plants, floating plants, and submerged plants, and provides conditions for the growth of aquatic plants and microorganisms in the water under aerobic-anoxic conditions. The depth of the bed can be adjusted according to the water transparency conditions of rivers, lakes and reservoirs. Therefore, the application of submerged ecological bed technology can carry out water ecological restoration in waters with low water transparency, large water level fluctuations, and submerged plants that are difficult to survive. The submerged ecological bed can adjust the three-dimensional position of the bed body and change according to the water quality condition. The submerged depth of the ecological bed makes the application range of the ecological bed more extensive.

The submerged plants on the submerged ecological bed absorb a large amount of nitrogen, phosphorus and organic matter in the water and convert them into their own biomass. The purpose of removing pollutants in the water can be achieved by harvesting the plants. In addition, the oxygen produced by the photosynthesis of the submerged plants creates an anaerobic atmosphere around the roots. Oxygen-aerobic microenvironment is beneficial for microorganisms to release N from the water body in the form of ammonium nitrogen, N ₂ O and other intermediate gases and N ₂ through nitrification-denitrification. Different carriers have different nutrient adsorption capacity and different bacterial loading capacity. Under different water quality conditions, the lower layer carrier attaches different media (nitrogen bacteria, organic matter degrading bacteria and adsorption media, etc.) and the upper layer of submerged plants. Matching and building different types of pollutant purification units can not only reduce the nutrient load, but also not affect the ecological landscape or achieve the purpose of improving and beautifying the environment. At the same time, when the water quality of the river is poor, the aeration device at the bottom of the submerged bed can be used Aerate the water body to strengthen the water quality of the evolutionary river.

(3) Biological contact oxidation bed

The biological contact oxidation bed uses a film-hanging material suitable for microbial growth, uses the biofilm on the filler and sufficient oxygen supply, and oxidizes and decomposes the organic matter in the wastewater through biological oxidation to achieve the purpose of purification. The biological contact oxidation bed has the advantages of short treatment time, strong adaptability to the change of influent organic load, good purification effect, good and stable effluent quality, no need for reflux or expansion of sludge, low power consumption, and convenient operation and management, etc. advantage.

(4) Ecological permeable dam

The section of the ecological permeable dam is a trapezoidal compound structure, and the slope coefficient of the dam slope is 1:1~1:2.5, which includes the following four parts: (A) The control layer is located on the facing slope of the ecological permeable dam, which consists of 1mm~5mm The volume of the dam building material is 5% to 15% of the entire permeable dam; (B) the transition layer, located inside the ecological permeable dam, is composed of 5mm to 10mm dam building materials, and its volume is 50% to 50% of the entire permeable dam. 65%; (C) The overflow layer, located at the crest of the ecological permeable dam, is composed of 10mm-40mm dam building materials, accounting for 10%-15% of the volume of the ecological permeable dam; (D) The stable layer, located at the ecological permeable dam The back slope of the dam is composed of 20mm-40mm dam-building materials, accounting for 20%-30% of the volume of the ecological permeable dam. The design process of the ecological permeable dam is to first survey the topographical conditions of the dam site and query the hydrometeorological data or other design data to obtain the geometric parameters and design flow of the ecological permeable dam, and then substitute the above parameters into the Dupin formula in seepage mechanics for testing. Calculate the reasonable permeability coefficient and residence time, and then carry out the further design of the ecological permeable dam, select the appropriate gravel gradation, dam building materials, and plant plants.

The ecological permeable dam has the following significant advantages: no power operation, reduced construction cost, good pertinence, can obtain about 10% COD removal rate, 10%-20% TN removal rate, 20%-40% TP removal rate.

3. Beneficial effect

The invention provides a method for reducing the low-pollution water load of venous rivers, and tests are carried out on the ecological floating island technology, submerged ecological bed technology, and biological contact oxidation technology. The analysis of the test results is shown in Figures 6-11. The ecological floating island technology was tested with emergent plants Xanthophyllum and Canna. The test results showed that the ecological floating island technology had a significant effect on the removal of TN and TP, and the removal rate of Xanthophyllum on TN and TP could reach 80%. The submerged ecological bed technology uses submerged plants hornwort and elodea. The test results show that the submerged ecological bed technology has obvious removal effects on SS, NH ₄ -N, NO ₃ -N, TN, and TP, of which NO ₃ - The removal rate of N, TN and TP can reach more than 60%. The biological contact oxidation technology is tested with ZH901 elastic three-dimensional filler. The test results show that the biological contact oxidation technology has obvious effects on the removal of SS, NH ₄ -N, TP, and COD, and the removal rate of NH ₄ -N, TP, and COD can reach 60%. Through the comprehensive application of the above technologies, the sewage water quality can be effectively improved.

Through the application of the invention, the removal rates of COD, ammonia nitrogen, total nitrogen and SS in venous channels can reach more than 60%. Finally, the venous channel can achieve better ecological effects and landscape effects, increase the number of fish and higher plants in the water, greatly increase the biomass of higher organisms, increase the number of aquatic plants, insects and birds on the floating islands, and make the artificial ecosystem Build gradually. Through artificially regulated ecological engineering construction, the water system microorganisms, aquatic plants, aquatic animals, substrate and water quality are dynamically balanced, and the succession is gradually restored to nature. Change the long-term disrepair and water quality deterioration of the river course, realize the integration of river course functionality, ecology and landscape, achieve the governance effect of "clear water, green banks, and beautiful scenery", and provide guarantee for the improvement of water quality in river network areas.

Description of drawings

Figure 1 is a schematic diagram of the structure of the method for reducing the low-pollution water load of venous rivers.

Figure 2 is a schematic diagram of a submerged ecological bed.

Figure 3 is a schematic diagram of biological contact oxidation.

Figure 4 is a schematic diagram of the ecological floating island.

Figure 5 is a schematic diagram of an ecological permeable dam.

In Figures 6-11, 0 represents the initial concentration, 1 represents the concentration value of the first week, 2 represents the concentration of the second week, 3 represents the concentration of the third week, and 4 represents the concentration of the second week. BK stands for blank control, SWJC stands for biological contact oxidation, HSC Xanthophyllum, MRJ stands for Canna, YLZ stands for Elodea, JYZ stands for Hornwort.

Figure 6 is a diagram of the purification effect of SS in sewage by ecological floating island technology, submerged ecological bed technology, and biological contact oxidation technology.

Figure 7 is a diagram showing the effect of purification of NH ₄ -N in sewage by ecological floating island technology, submerged ecological bed technology, and biological contact oxidation technology.

Fig. 8 is a diagram showing the purification effect of NO ₃ -N in sewage by ecological floating island technology, submerged ecological bed technology and biological contact oxidation technology.

Figure 9 is a diagram of the purification effect of TN in sewage by ecological floating island technology, submerged ecological bed technology, and biological contact oxidation technology.

Figure 10 is a diagram showing the effect of purification of TP in sewage by ecological floating island technology, submerged ecological bed technology, and biological contact oxidation technology.

Figure 11 is a diagram of the purification effect of COD in sewage by ecological floating island technology, submerged ecological bed technology, and biological contact oxidation technology.

Figure 12 shows the spatial layout of key technologies for venous river load reduction in the river network area of southern Jiangsu.

In Figure 12, ①⑥ represents ecological floating islands and ecological restoration, ②⑤ represents ecological permeable dams, ③ represents submerged ecological beds, and ④ represents biological contact oxidation.

Detailed ways

Taking a certain river channel in the southern Jiangsu river network area as an example, an experimental study was carried out. Aiming at the pollution characteristics of the river channel and the functional requirements of the venous channel for treating low-polluted water, a venous channel was constructed, and a demonstration project plan for venous channel load reduction was designed. Ecological bed technology, biological contact oxidation technology, ecological floating island technology, etc. transform nitrogen and phosphorus nutrients, and strengthen the purification of river water quality. The upper and lower reaches of the venous river adopt ecological floating island and shore restoration technology, the middle and upper reaches and the middle and lower reaches respectively adopt submerged ecological bed technology and biological contact oxidation technology, and design two ecological permeable dams. The specific implementation space layout of the demonstration project is shown in Figure 12.

Within 5m of both sides of the upper reaches of the venous river, bank restoration is adopted, and water spinach, reeds, cattails, yellow calamus, wild rice stems, water chestnuts, cannas, etc. are planted to form a water-land staggered zone and a shore buffer zone. The ecological floating island technology is adopted in the upstream river channel. The ecological floating island is designed to be 2m long and 1m wide. Two columns are placed in the river channel, and the interval between each two is 2m. Grass, canna, cattail, etc. The underwater part of the floating island is placed with microbial carriers, which are covered with efficient denitrification bacteria (ammonification, nitrification, nitrosation, denitrification bacteria). An ecological permeable dam is set between the upper and middle reaches of the river. The permeable dam is mainly constructed of 5-10mm (volume fraction 40%) gravel and 2-4cm (volume fraction 60%) gravel. The permeable dam has a trapezoidal structure along the direction of water flow. The crest is 4.6m long, the dam bottom is 15.6m long, the width is 12.7m, and the height is 2.2m ^. . Canna and calamus are planted on the surface of the ecological permeable dam with a planting density of 40 plants·m ^-2 . Set up a submerged ecological bed in the middle reaches of the river. The upper part of the submerged ecological bed is a submerged plant bed, and the plants are planted with Elodea and hornwort. The lower part is a removable microbial bed. Air system, the top of the submerged bed is a buoyancy adjustment device, and the bottom is an anchoring device. Then set up biological contact oxidation in the middle reaches of the river, using ZH901 elastic three-dimensional filler, the submerged ecological bed and biological contact oxidation are both 2m long, 1m wide, and 0.6m high, two rows are placed in the river, and the interval between each two It is 2m. An ecological permeable dam is first set up before the downstream of the river, and its parameters are the same as those between the upper and middle reaches of the river. Within 5m of both sides of the lower reaches of the river, shore restoration will be carried out, and reeds, cattails, yellow calamus, cannas, and umbrella grasses will be planted. The ecological floating island technology is adopted in the river channel. The design length of the ecological floating island is 2m and the width is 1m. Two columns are placed in the channel, and the interval between each two is 2m.

Through the implementation of the low-pollution water load reduction demonstration project in venous rivers, it can be seen from the water quality changes at the end of the river that the concentration of NH ₃ -N, TN, TP and other pollutants in the river water has decreased significantly, and the tail water NH ₃ -N, NO ₃ -N, TN, TP and other pollution load reduction rates have reached more than 80%, and the water quality has improved significantly.

Table 1 Water quality monitoring data at the end of venous river before and after project implementation (mg/L)

Claims (2)

1. the method for cutting low-pollution water load of venous riverway the steps include:

(1) utilize the nearly natural type of abandoned channel or bottom land river course to make up the vein river course,

(2) in the vein river course, ecological floating island and bank are set at the upper reaches and repair band by water (flow) direction;

(3) between the upper reaches, vein river course and middle reaches, ecological permeable dam is set;

(4) at the vein middle reaches the ecological bed and bio-contact oxidation bed of submergence type is set;

(5) between vein middle reaches and downstream, ecological permeable dam is set;

(6) ecological floating island and bank are set in downstream, vein river course and repair band;

Wherein at ecological bed buoyancy regulating device, the anchoring device of comprising of submergence type described in the step (4); Submerged plant bed, mikrobe bed, aerating apparatus, micropore aeration pipe; Wherein the ecological bed top of submergence type is the submerged plant bed, and the bottom is a removable type mikrobe bed, and micro-pore aeration system is established in subduction bed bottom; Subduction bed top is a buoyancy regulating device, and the bottom is an anchoring device; Be ecological floating island plant-immobilization nitrogen-cycle bacteria mikrobe mutualism system at ecological floating island described in step (2) and (6) wherein, it can strengthen the nitrogen phosphorus of removing in lake, the river water, and step is:

A) on the collection of diving water body in lake, domestication, screening efficient denitrification bacterium, comprise Ammonifying bacteria, nitrobacteria, nitrite bacteria and denitrifying bacterium;

B) prepare and be suitable for microorganism growth, have the little environmental fixation support of biocompatibility, environment concordance;

The efficient nitrogen-cycle bacteria that C) will filter out is fixed on the biological compatibility carrier, prepares immobilization efficient denitrification bacterium;

D) adopt the ecological floating island technology vein river water body to be purified, set up ecological floating island plant-immobilization nitrogen-cycle bacteria mikrobe mutualism system reinforcement and remove lake, river water nitrogen phosphorus with immobilization nitrogen-cycle bacteria technology is integrated.

2. the method for cutting low-pollution water load of venous riverway according to claim 1; It is characterized in that the vein river course is the nearly natural type river course that utilizes abandoned channel or bottom land to make up, the river flow velocity is slow, self-purification capacity a little less than; Pollute slight; Had slight eutrophication phenomenon, riverbank are main with sloping bank, and vegetation is abundanter.

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