Constructed wetland-microbial fuel cell coupled treatment device and treatment method for rural domestic sewage

Abstract

The invention discloses a constructed wetland-microbial fuel cell coupled treatment device and treatment method for rural domestic sewage. The treatment device comprises a grid, an adjusting tank, a water pump, a water inlet pipe, a water collecting pipe, a water outlet pipe, a return pipe, a water outlet tank, a constructed wetland and a microbial fuel cell, wherein the grid, the adjusting tank,the water pump, the water inlet pipe and the constructed wetland are sequentially connected; the multi-electrode microbial fuel cell is arranged in the constructed wetland; the water collecting pipe of the constructed wetland leads to the water outlet tank; and the bottom of the water outlet tank is connected with the water outlet pipe and the return pipe. Domestic sewage firstly enters the adjusting tank through the grid, then enters the device from the water inlet pip via the water pump, undergoes treatment under the dual action of the constructed wetland and the microbial fuel cell, and then enters the water outlet tank via the water collecting pipe, and 50% of the sewage is discharged through the water outlet pipe while the other 50% of the sewage flows back through the return pipe; the hydraulic retention time of the sewage is 1.5-2.0 days; the concentration of dissolved oxygen in a cathode region is 1.0-1.5 mg/L; and the output current of the device is more than 0.96 mA. The constructed wetland-microbial fuel cell coupled treatment device provided by the invention is simple in structure, convenient to operate and capable of effectively treating rural domestic sewage.

Description

technical field [0001] The invention belongs to the technical field of water pollution control and water treatment, and in particular relates to an artificial wetland-microbial fuel cell rural domestic sewage treatment device and a treatment method thereof. Background technique [0002] At present, there is a widespread phenomenon of direct discharge of domestic sewage such as washing, kitchen, and laundry in rural areas of our country. The random discharge of domestic sewage will not only pollute water bodies and damage the village environment, but also affect the safety of drinking water for villagers. The traditional centralized sewage treatment facilities represented by activated sludge are relatively complete and mature, and have significant environmental and social benefits. It is also relatively high, and it is not suitable for vast rural areas and small towns in economically backward areas where capital and technology are relatively lacking. Therefore, it is of gre...

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Problems solved by technology

[0004] After searching the literature of the prior art, it is found that the existing constructed wetland-microbial fuel cell coupling system, such as CN201510351628.0, is a device that strengthens the constructed wetland to remove drug residues and prevent the spread of drug-resistant bacteria. The device includes a reed tower , microbial fuel cell constructed wetland and electrochemical reaction area, the purpose is to provide a method of utilizing the coupling effect of root exudates and bioelectrochemistry to promote the removal of drug residues in constructed wetlands and prevent the spread of drug-resistant bacteria, which improves the resistance to drugs Residue removal efficiency; CN201621282372.9 discloses a constructed wetland fuel cell and a purification system for compressed water from food waste, including an upflow anaerobic reaction bed, an anaerobic-aerobic co-processing device and a constructed wetland fuel cell. The purification system has a good purification effect on the compressed water of kitchen waste; CN201711384102.8 provides a coupling device for artificial wetland and microbial fuel cell wastewater treatment to treat pig farm production wastewater, and its discharge wastewater can reach GB18596-2001 "Pollutant Discharge Standards for Livestock and Poultry Breeding Industry"; CN201610380134.X discloses a sewage treatment system and method for tidal flow artificial wetland coupled with microbial fuel cells. The operation mode of tidal flow achieves the purpose of efficient sewage treatment, but the system operates intermittently, the amount of water treated is not as good as that of the continuous operation system, and the operation is more complicated

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