Baffling type constructed wetland device for treatment of low-concentration area source pollution

Abstract

The invention relates to a baffling type constructed wetland device for treatment of low-concentration area source pollution, which comprises a pool body (2), filler arranged in the pool body, emergent aquatic plants grown on the surface layer of the filler and a guide wall (6) dividing the pool body into a plurality of cells. The guide wall (6) is provided with a water through-hole. The invention can realize the hybrid exchange of the upper water layer and the lower water layer, thereby improving the water flow conditions of the traditional constructed wetland, increasing the twists and turns of the flow in the wetland bed, extending the sewage flow, increasing the contact time of the sewage and the substrate, preventing the 'short-circuiting' in the wetland bed, and enhancing the utilization efficiency of the wetland bed. Moreover, the invention adopts the blast furnace slag, lime stone, broken stone and other substrates with high degradation efficiency for nitrogen and phosphorus to substitute the gravel to fill the bed, and the substrate can be prepared according to different gradations of the filler, thereby improving the porosity of the bed, preventing the blockage of the wetland, and realizing high-efficiency removal of the nitrogen and phosphorus.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a baffle type constructed wetland device for treating low-concentration non-point source pollution. Background technique [0002] With economic development and social progress, point source pollution has been effectively controlled and cured. However, with the further expansion of urban scale, urban rainfall runoff pollution has become the second largest non-point source pollution after agricultural non-point source pollution. The phenomenon of deterioration of water quality around cities caused by non-point source pollution is becoming more and more prominent. Due to the accelerated development of my country's urbanization level, the proportion of permeable areas is getting smaller and smaller. The sudden and impactful urban non-point source pollution caused by rainstorm runoff has become one of the main sources of water environmental pollution in receiving ...

AI Technical Summary

Problems solved by technology

The three types of wetlands have their own outstanding advantages, but at the same time there are also shortcomings, such as surface flow wetlands have strong oxygenation capacity and good nitrification effect, but they occupy a large area, have small hydraulic loads, and are difficult to remove pollutants. The capacity is limited, the operation of the system is greatly affected by the climate, and mosquitoes and flies are easy to breed in summer; the horizontal subsurface flow artificial wetland can withstand large hydraulic loads, is less affected by temperature, and has good sanitary conditions, but the cost is high and the control is relatively complicated; The vertical subsurface flow constructed wetland has the strongest oxygenation effect and strong nitrification ability, and is suitable for treating sewage with high ammonia nitrogen content, but the ability to treat organic matter is not good, the construction requirements are high, the control is complicated, and the plugging of fillers is easy to occur

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