The invention discloses a river channel purification system for processing rural domestic sewage, belonging to the field of rural sewage processing. The system is characterized in that a processing unit is established by utilizing a waste river channel or a swale near-natural type channel; a plant grid sedimentation unit, an artificial biomimetic material contact oxidation unit, a vertical current artificial wetland unit and a floating plant unit are successively arranged from top to bottom according to the direction of water flow; and the rural domestic sewage is processed successively through the four processing units so as to finally achieve the purpose of improving water quality. The system has the advantages that the removing rates of CODcr, SS, NH3-N, TN and TP of the domestic sewage entering the system respectively reach 77.1%, 84.1%, 70%, 68% and 58.8% through the application of the invention; the effect of reducing the pollution load and improving the water quality is realized; and the system provides the guarantee to the improvement of the water environment quality in a downstream river.

River channel purification system for processing rural domestic sewage

The invention provides a water environmental risk source risk representing method in a drainage basin transboundary region. The method is used for evaluating the risk level of a risk source of the drainage basin transboundary region. The risk source of the transboundary region is divided into five categories including a surface source, production enterprises, a centralized treatment place of waste, a chemical storing site and transportation. The method includes the fives steps that first, a risk source risk index system of the transboundary region is constructed, the risk index systems of the five categories of risk sources respectively comprise three first-level indexes and a plurality of second-level indexes, the numbers of the second-level indexes in the risk index systems are different, and the indexes comprise three risk levels of the high risk level, the middle risk level and the low risk level; an information database of the risk sources of the transboundary region is established, values are assigned to all the second-level indexes, and the values of the all the second-level indexes are standardized to [0,1]; then, fuzzy weights of the indexes are determined; next, a fuzzy integration method is adopted for respectively calculating the risk indexes of the risk sources, the self-purification index of environmental mediums, and the vulnerability index of risk receiving bodies; finally, the risk indexes of the risk sources are calculated through the fuzzy integration method so that the risk levels of the risk sources can be represented.

Water environmental risk source risk representing method in drainage basin transboundary region

The invention relates to a method for improving water quality of a steep-slope river by drop-aeration The invention comprises the following steps: driving wood piles at two sides of a river channel, backfilling a mixture of crushed stones and soil into a riverbed between a revetment and the piles, covering vegetation to form a plant platform, pouring a trapezoid concrete pier across the river channel to form a overflow weir, and stacking block stones on the overflow weir, wherein the block stones are divided into two sides; the side with higher block stones has small gaps, and the side with lower block stones has large gaps The invention solves the defects that existing river treatment method results in the loss of deep pools and shoals in natural rivers; primary producers such as various phytoplankton and zooplankton can not reproduce; and benthic and large animals which eat them can not inhabit the river The invention has low cost, and good permeability, can provide aquatic animals and plants with habitat space, can form a multi-flow changing zone, a multi-organism growing zone, and a multi-fish hideout, has good drop-aeration effect, and can reduce soil loss

Method for improving water quality of steep-slope river by drop-aeration

The invention discloses a water-saving and pollution-reducing method for irrigation and drainage coupled water circulation use in a flat ecological irrigation district, wherein an irrigation district drainage period and an irrigation district water need period are comprised; during the irrigation district drainage period, field drained water enters a cyclically-adjusting wetland reservoir through a drainage ditch, sediments, pesticides and heavy-metal harmful substances are intercepted and purified through a submerged plant zone and an ecological wetland purification island system, and nitrogen and phosphorus nutrient substances are treated, thus reducing the harms of drainage to the water bodies of rivers and lakes; during the irrigation district water need period, water bodies in the cyclically-adjusting wetland reservoir are extracted by a water extraction pump and distributed to irrigation district farmlands, thus increasing the utilization efficiency of water resources, wherein the residual nitrogen and phosphorus nutrient substances can also be needed by the growth parts of crops. The water-saving and pollution-reducing method disclosed by the invention has the advantages of coupling irrigation and drainage processes in the ecological irrigation district, reducing the influences caused by the drainage of farmland surface source pollutants on rivers and lakes, increasing the utilization efficiency of water resources and chemical fertilizers, and realizing the sustainable development of the ecological water-saving irrigation district agriculture.

Water-Saving and Pollution-Reducing Method for Water Circulation use in Irrigation and Drainage Coupled Ecological Irrigation District in Flat Areas

The invention provides a method for repairing a eutrophic water body by using vallisneria spinulosa The method comprises the following steps: (1) selecting the eutrophic water body needed to be repaired and measuring; (2) selecting the vallisneria spinulosa, hydrilla verticillata, cyperus alternifolius and myriophyllum aquaticum as aquatic plants for repairing the water body, and growing the plants in a test water pond filled with the tested water body, wherein sand of 15-20cm is added into the water pond, three groups are repeated, a sand-containing plant-free water pond is taken as a control group, and the plants are soaked in clear water within 24 hours to remove residual algae on the plants and withered stems and leaves of the plants are picked off before the plants are grown in the test water pond; (3) cultivating the plants grown in the test water pond and testing According to the method, the vallisneria spinulosa, the hydrilla verticillata, the cyperus alternifolius and the myriophyllum aquaticum are cultivated together to repair the eutrophic water body, the repair effect is remarkable, relatively good ecological benefit is achieved, the environment is protected, and the landscape configuration effect is enhanced

Method for repairing eutrophic water body by using vallisneria spinulosa

The invention discloses a method for cutting low-pollution water load of a venous riverway and belongs to the field of water treatment. The method comprises the following steps: (1) constructing the venous riverway by utilizing a waste riverway or a bottomland near-natural type riverway, (2) arranging an ecological floating island and a shoreside restoration belt in the upper stream of the venousriverway according to the direction of current, (3) arranging an ecological water permeable dike between the upper stream and the midstream of the venous riverway, (4) arranging a submerged type ecological bed and a biological contact oxidation bed in the midstream of the venous riverway, (5) arranging an ecological water permeable dike between the midstream and the lower stream of the venous riverway, and (6) arranging an ecological floating island and a shoreside restoration belt in the lower stream of the venous riverway. Through the application of the method, the removing rates of COD, ammonia nitrogen, total nitrogen and SS can reach over 60 percent respectively so as to make the venous riverway achieve good ecological effect and landscape effect finally. The method realizes the integration of functionality, ecology and landscape of the riverway, achieves the treating effect of clean water, green bank and beautiful scene, and provides guarantee for water quality of a river network area.

Method for cutting low-pollution water load of venous riverway

In this paper, Hongqi River of WuJin River watershed (china) was selected as an example, aims to use QUAL2K water quality model simulation water environmental capacity of the Hongqi River, forecasting the pollution load of the Hongqi River basin, and compared to the actual emissions of pollution load, calculated the load reduction rate for satisfying the water quality objectives. At the same time, using QUAL2K simulation different water quality improvement programs contains submerged-type eco-bed technology, bio-contact oxidation technology and ecological floating bed technology, selected optimal program, and calculate the load reduction rate of the river end when implement this optimal program. According to comparison of the load reduction rate for water quality meet the standards and the load reduction rate of the optimal program, proposed effective measures to reduce pollution load of Hongqi River basin. The result shows that environmental management strategies or integrated engineering measures need to be taken to reduce the TN by 23.20% can make the water quality meet the standards. In order to meet the environmental capacity of Hongqi river, effectively improve water environmental quality, presented through source pollution control, non-point source pollution intercept and environmental management measures to reduce the amount of pollutants flow into the river, and with the implementation of load reduction key technologies in the river, together make the Hongqi River water quality meet the standards.

The study of venous channel water pollution load reduction technologies

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Method for cutting low-pollution water load of venous riverway

The study of venous channel water pollution load reduction technologies