A microbial fuel cell coupling constructed wetland u-shaped device and its operating method

Abstract

The invention discloses a U-shaped device coupled with a microbial fuel cell to a constructed wetland and an operating method. The device is fed with water from a cathode, and the environment in which the sewage passes is aerobic-anaerobic-aerobic, which is consistent with the oxygen environment required for the denitrification process. , the nitrifying bacteria first convert nitrogen-containing organic matter into ammonia nitrogen under the aerobic conditions provided by the cathode area, and further convert ammonia nitrogen into NO under the same conditions 2 ‑N, the final product is NO 3 ‑N, with sufficient NO 3 ‑N waste water enters the anode area under the action of hydraulic load and gravity, and undergoes denitrification process in an anaerobic environment, and finally NO 3 ‑N is converted to nitrate. The invention can also generate electric energy while strengthening the removal of nitrogen-containing organic matter, realizes resource utilization of sewage, and is beneficial to energy saving and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of microbial fuel cells, and in particular relates to a U-shaped device coupled with a microbial fuel cell to a constructed wetland and an operating method. Background technique [0002] The current industrial development is rapid, and the accompanying environmental pollution is also becoming more and more serious. The treatment of many industrial wastewaters has become a major problem, especially in the face of nitrogen-containing wastewater, especially high-concentration nitrogen-containing wastewater. Reaching the standard also requires high treatment costs, and the traditional treatment method occupies a large area, has low treatment efficiency and complicated process. The traditional wastewater denitrification method is generally AAO. This method first needs to degrade the refractory substances in the nitrogen-containing wastewater, and then treat the nitrogen-containing wastewater by inputting carbon s...

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Problems solved by technology

[0007] The object of the present invention is to provide a method for solving the problems in the prior art that the artificial wetland technology occupies a large area, the construction period is long, the investment cost is high, the emission of greenhouse gases (methane) is increased, and the removal effect of nitrogen and phosphorus elements is not good. Microbial fuel cell coupling constructed wetland U-shaped device and operation method to improve nitrogen removal efficiency, effectively remove organic matter and total nitrogen in sewage through triple treatment of horizontal subsurface flow and vertical flow constructed wetland in series, and further reduce nitrogen and phosphorus content in effluent water , reduce wetland methane emissions, prevent water pollution from being transferred to air pollution, and generate clean energy—electric energy. On the premise of achieving the best removal effect, control operating conditions, reduce energy consumption and construction costs

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