Portable combined constructed wetland purifying box for farmland drainage ditch

Abstract

The invention relates to a portable combined constructed wetland purifying box for a farmland drainage ditch. The portable combined constructed wetland purifying box is characterized in that a single portable combined constructed wetland purifying box frame is built through reinforcing steel bars, plastic plates and wire gauzes. The purifying box in the frame comprises a micro constructed wetland area, a biological cleaning ball area and an activated carbon adsorption area. Lateral sides of the single portable combined constructed wetland purifying box can be opened so as to facilitate regular replacing of fillers in the box. The portable combined constructed wetland purifying box is small in size, can be placed in the farmland drainage ditch conveniently and is convenient to move. A plurality of portable combined constructed wetland purifying boxes are connected in series and placed in the farmland drainage ditch, and farmland drainage water enters the boxes through water inlets of the purifying boxes and sequentially passes through the lower portions of the biological purifying ball areas, the activated carbon adsorption areas, the upper portions of the biological purifying ball areas and the micro constructed wetland areas to be purified and processed. The portable combined constructed wetland purifying box has the advantages of being capable of reducing the farmland non-point source pollution receiving water eutrophication degree and risks and reducing content of harmful substances such as heavy metal and pesticide residues in the farmland drainage so as to reduce damage of the harmful substances to receiving water aquatic organisms.

Description

technical field [0001] The invention belongs to the technical field of farmland non-point source pollution control, in particular to a portable composite artificial wetland purification box capable of reducing the concentrations of nitrogen, phosphorus, organic matter, heavy metals and pesticide residues in farmland drainage ditches. Background technique [0002] The long-term and unreasonable application of chemical fertilizers and pesticides in agricultural production has caused damage to the internal structure of the ecosystem, and the loss of pollutants such as nitrogen, phosphorus, heavy metals, and pesticide residues has caused pollution of surface water and groundwater. Another major and universal source of pollution. Nitrogen and phosphorus nutrients in farmland drainage are the main causes of eutrophication in receiving water bodies. Harmful substances such as heavy metals and pesticide residues enter the water body and directly cause harm to aquatic organisms. Wha...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the problem of farmland non-point source pollution control, and propose a portable composite artificial wetland box for farmland drainage ditches, which can effectively control the concentration of nitrogen and phosphorus in farmland drainage by placing a portable composite constructed wetland purification box in the farmland drainage ditch , so as to reduce the degree of eutrophication of the receiving water body from farmland non-point source pollution; reduce the content of harmful substances such as heavy metals and pesticide residues in farmland drainage to reduce its harm to aquatic organisms in the receiving water body

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