Artificial wetland system for treating rural domestic sewage

Abstract

The invention provides an artificial wetland system for treating rural domestic sewage. The system comprises a microbial fuel cell wetland module, which sequentially comprises an impermeable bottom layer, a sewage distribution layer, an anode layer, an insulating filler layer, a gas distribution layer, a cathode layer and a planting matrix layer from bottom to top, wherein the anode layer comprises an upper layer, a sandwich layer and a lower layer, the upper layer and the lower layer are plate-shaped anode materials with meshes, the upper layer is electrically connected with the lower layer,the sandwich layer is an active microorganism layer, and is filled between the upper layer and the lower layer, the cathode layer comprises a plate-shaped material with meshes, gas distributed in thegas distribution layer contains oxygen, and the anode layer and the cathode layer are connected with an external circuit through conduction wires to form a closed circuit. The artificial wetland system for treating rural domestic sewage has the advantages of high removal rate of organic matters, nitrogen and phosphorus in domestic sewage, high conversion rate of electric energy and low construction cost.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an artificial wetland system for treating domestic sewage in rural areas. Background technique [0002] With the development and changes of my country's rural economy and rural lifestyle, the discharge of rural domestic sewage has increased, and the environmental pollution caused by rural sewage has become increasingly serious. The basic characteristics of rural domestic sewage in my country are: small and dispersed, low discharge coefficient; low concentration of suspended solids, ammonia nitrogen and total phosphorus and other pollutants; complex components, strong biochemical properties; intermittent discharge, regular; heavy metals And so on less toxic and harmful substances. [0003] Combined with my country's national conditions, most of the rural domestic sewage in my country adopts pretreatment of sewage (fermentation treatment), and the pretreated sew...

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Problems solved by technology

However, surface flow constructed wetlands mainly rely on the rhizome interception of aquatic plants and the degradation of biofilm on the rhizomes to achieve pollutant removal. Generally, the water level is shallow, so the hydraulic load is large, the purification capacity is limited, and the sanitation conditions are poor. Rarely used; subsurface flow constructed wetlands and vertical subsurface flow constructed wetlands have better effluent water quality, but their structures are relatively complex and occupy a large area, especially susceptible to seasonal influences, and pretreatment devices need to be installed before sewage enters the water, otherwise it is easy to block

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