Water toxicity monitoring method based on anaerobic pretreatment and air-cathode MFC

Abstract

Disclosed is a water toxicity monitoring method based on anaerobic pretreatment and an air-cathode MFC. The method comprises judging whether an anode chamber is disturbed by dissolved oxygen according to the dissolved oxygen concentration of feed water of the anode chamber; if the disturbance exists, starting an ultrasonic deaerating plant to pre-treat the feed water, and leading the pre-treated feed water into an MFC reactor for a reaction after the pre-treated feed water is qualified through a test with a dissolved oxygen sensor; and after a water sample is subjected to pretreatment including filtration and sterilization, allowing the water sample to undergo physical anaerobic pretreatment and flow in a ''two-in-one'' air-cathode MFC reactor for test, and collecting an electrical signal output by the MFC for judging the biotoxicity of water. According to the method, the high electricity generation efficiency of a ''two-in-one'' air-cathode MFC provided with a single-chamber air cathode is developed, and through introduction of a deaerating process, the stability of the water biotoxicity early-warning and monitoring equipment is improved.

Description

Technical field [0001] The invention relates to an improved method for monitoring water quality biological toxicity based on microbial fuel cell technology, and is applied to the fields of water quality early warning monitoring of sudden water pollution events and the like. Background technique [0002] Microbial fuel cell (MFC): A device that uses electricity-producing bacteria on the anode as a biocatalyst to generate electricity while degrading organic matter. The principle is as figure 1 Shown. The anodic electricity-producing bacteria produce protons and electrons in the process of degrading organic matter in the matrix. The protons are transferred to the cathode chamber through the cation exchange membrane, and the electrons are transferred to the cathode carbon rod through the external circuit, and are accepted by the reduced electron acceptor in the cathode chamber Close the loop. In this process, the flow of electrons in the external circuit generates current, which re...

AI Technical Summary

Problems solved by technology

Once the water sample or culture solution entering the anode chamber has a high dissolved oxygen content, it will cause the oxygen directly in the anode chamber to become an electron acceptor, thereby rapidly reducing the power generation efficiency of the MFC and losing the monitoring ability

At present, there is no technical solution that can effectively make up for the lack of interference of dissolved oxygen in the anode chamber for early warning monitoring of water quality and biological toxicity based on the single-chamber air cathode "two-in-one" MFC reactor technology

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