Anti-clogging economic crop type filter bed-baffle subsurface flow constructed wetland enhanced nitrogen and phosphorus removal system

Abstract

The invention discloses an anti-clogging economic crop type filter bed-baffle subsurface flow constructed wetland enhanced nitrogen and phosphorus removal system which comprises a plant filter bed and a baffle subsurface flow constructed wetland as two main systems; the device intercepts a large amount of organic matters and suspended solids through plant roots in the filter bed, and plant residues are taken out from a water body when in harvest to prevent wetland clogging caused when sewage flows through the subsurface flow constructed wetland; meanwhile, the baffle subsurface flow constructed wetland extends the hydraulic retention time when the sewage flows through the wetland; the environment around the plant roots continuously shows aerobic, anoxic and anaerobic states, equivalent to a plurality of A2/O units connected in parallel or series; the nitrogen removal effect is significant; the phosphorus adsorbing effects of a ceramic substrate and a gravel substrate are also significant. In addition, the difference of plants in the nitrogen and phosphorus absorption effect is also comprehensively considered in the grading planting of vegetable type and food crop type plants to make up the deficiency that single plant absorbs nutrient salt; the entire ecosystem achieves the dual combination of environmental benefits and economic benefits of a constructed wetland.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment, in particular to an anti-clogging economic crop type filter bed-baffle plate subsurface flow artificial wetland enhanced nitrogen and phosphorus removal system, which is suitable for tail water of domestic sewage, polluted river water and high-concentration ammonia nitrogen wastewater deal with. Background technique [0002] Constructed wetlands are engineered wetlands that are artificially constructed and managed. They are composed of water, filter materials, and aquatic organisms. They have higher productivity and better pollutant removal effects than natural wetlands. It mainly uses the principle of gravity flow. When the sewage flows through the pores of the filter material, the pollutant content in the sewage is reduced through the adsorption of pollutants by the filter material, the absorption of pollutants by plant roots, and the assimilation of pollutants by microor...

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Problems solved by technology

[0005] Technical problem: Aiming at the shortcomings of the existing constructed wetlands in the prior art that are easy to block and have low economic benefits, the technical problem to be solved by the present invention is to provide an anti-clogging economic crop type filter bed-baffle plate subsurface flow constructed wetland to enhance denitrification The phosphorus removal system intercepts a large amount of organic matter and suspended solids through the plant roots in the filter bed, and the plant residues are taken out of the water body during harvesting to prevent wetland blockage caused by sewage flowing through the subsurface constructed wetland

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