Moveable assembled water quality purifier for field drainage ditch
A technology of farmland drainage and purifier, which is applied in the field of farmland non-point source pollution control, can solve pollution, reduce eutrophication and other problems, achieve good treatment effect, increase residence time, and low cost
Inactive Publication Date: 2014-05-14
HOHAI UNIV
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[0004] The invention provides a movable assembled farmland drainage ditch water quality purifier, the purpose of which is to overcome the problem of farmland non-point source pollution. By directly placing the water quality purifier in the farmland drainage ditch, the concentration of nitrogen and phosphorus in farmland non-point source pollution can be effectively controlled, thereby Reducing the degree of eutrophication of receiving water body polluted by farmland non-point source
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[0021] A rice field drainage ditch in a village in southern Jiangsu has a channel width of 1.5m, a water surface width of 1.2m, a water depth of 0.8m, and a water flow velocity of 0.23m / s. Excavate two diversion channels with a width of 1.5m, a length of 30m and a depth of 1m at the end of the farmland drainage ditch. The flow velocity of the water flowing through the part of the diversion channel excavated at the end of the drainage ditch is 0.8m / s. Use 120cm × 40cm × 40cm water purifiers to stack and fill the diversion channel and the original channel.
[0022] Under the conditions of this example, it can be seen from the example data that the COD in farmland drainage Cr The removal rate can reach 38%, TP, TN, NH 3 The removal rate of -N can also reach about 30%; the biofilm on the biological purification ball is completed in about 10 days, and the treatment efficiency reaches the highest level. After the 15th day, the adsorption capacity of activated carbon is obviously r...
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Abstract
The invention relates to a moveable assembled water quality purifier for a field drainage ditch. The purifier is characterized in that one or two dividing channels are excavated next to the original channel according to surface source pollution degree of the field and flow rate of water flow in the field drainage ditch, wherein the dividing channels are equal to the original channel, so that the flow rate of the water flow is remarkably reduced and the hydraulic retention time can be greatly increased. A monomer water quality purifying box is prepared by reinforcing steel bars and steel wire nets. Different monomer water purifiers in different sizes can be selected according to section sizes of the field drainage ditches to combine and arrange to fill the whole channel, so that field flows as many as possible are treated by the water purifiers. The purifier has the advantages that the eutrophication degree and risk of a receiving water of the surface source pollution of the field can be reduced, and pesticide residue and organic matters hardly biodegradable in the field drain water can be absorbed to a certain extent. Meanwhile, the purifier provided by the invention is few in construction work, convenient to maintain and manage, good in treatment effect, simple to prepare and low in cost.
Description
technical field [0001] The invention relates to a water purifier capable of reducing the content of nitrogen, phosphorus, organic matter and difficult-to-biodegrade pesticide residues in farmland drainage ditches. The invention belongs to the technical field of farmland non-point source pollution control. Background technique [0002] Farmland non-point source pollution has become the main cause of eutrophication in many water bodies in my country, and its contribution rate exceeds point source pollution from urban domestic sewage and industry. Water pollution caused by farmland non-point source will be the biggest challenge for China's sustainable development one. Farmland non-point source pollutants produced by farmland drainage are relatively complex and vary with the types of fertilizers and pesticides applied, but generally they are mainly nitrogen, phosphorus, organic matter and pesticide residues. Effective control of nitrogen and phosphorus concentrations in farmlan...
Claims
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IPC IPC(8): C02F3/34E02B11/00
Inventor 王沛芳钱进侯俊王超范秀磊
Owner HOHAI UNIV