Floating-bed plant coupling sediment microbiological fuel cell water purification method

Abstract

The present invention relates to a microbial fuel cell water purification method, particularly to coupling of ecological floating islands and microbial fuel cells, wherein the method can be used for ecological restoration of contaminated river courses, lakes and parks, residential districts and other landscape water bodies, and belongs to the water body pollution remediation in environmental projects. According to the present invention, the black and odor river sediment or city sludge is adopted as the bottom matter, the carbon felt is adopted as the anode, and the graphite disc is adopted as the cathode to construct SMFC; floating-bed plants are introduced, and are planted on the overlying water body by using the floating body to form the floating-bed plant-sediment microbiological fuel cell (P-SMFC); with the combination of the floating-bed plant root system secretion characteristics, the root system secretions provide nutrients for the rhizospheric microorganisms; and the root system radially secretes oxygen to make the rhizospheric zone form a lot of aerobic zones, and the oxygen secreted by the plant root zone can spread to the SMFC cathode, such that the cathode region dissolved oxygen concentration is increased, and the restoration performance of the SMFC on the sediment pollution and the overlying water pollution are improved.

Description

Technical field: [0001] The invention relates to the field of fuel cell water purification, in particular to a water purification method for floating bed plants coupled with sediment microbial fuel cells. Background technique: [0002] The use of organic matter in seabed sediments to generate electricity is called "unattended submarine generator", and water pollution remediation technology based on sediment microbial fuel cells (SMFC) has gradually developed. In SMFC, the anode is usually placed in the anoxic bottom sediment, while the cathode is suspended in the oxygen-containing water above the anode. The cathode and anode are connected by wires and connected to a resistor to form a closed loop. Under the catalysis of anaerobic microorganisms, the organic matter in the sediment is oxidized in the anode area, and the generated electrons pass through the cell membrane to the anode, and then transfer to the cathode through an external circuit. On the other hand, the hydrogen...

AI Technical Summary

Problems solved by technology

The main reason is that there are many influencing factors, high development cost, low power production efficiency, lack of continuity and stability, and there is still a certain distance from practical application.

The power generation capacity and pollutant removal efficiency of SMFC are still very limited, mainly because: (1) the electrode spacing is large, resulting in a large internal resistance of SMFC; (2) the solubility of oxygen in the overlying water suspended by the cathode is low; (3) Over time, microorganisms and chemicals are deposited on the surface of the cathode; (4) The anode and cathode are more difficult to fix

[0008] There are more and more studies on the restoration of water bodies by constructing MFC systems and the restoration of substrates by SMFC systems; however, there are few studies on the restoration of substrates and the treatment of wastewater by adding plants on the basis of SMFCs; especially It is to introduce floating bed plants into the sediment microbial fuel cell system to realize the in-situ repair of sediment pollution and overlying water pollution in the process of electricity production, which has not been reported at home and abroad.

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