Method and device for removing polychlorinated biphenyls (PCBs) in bottom mud through cathode anaerobism/anode aerobiosis coupling stimulated by micro electric field

Abstract

The invention discloses a method and a device for removing polychlorinated biphenyls (PCBs) in bottom mud through cathode anaerobism/anode aerobiosis coupling stimulated by a micro electric field. The device comprises an anode chamber and a cathode chamber, wherein the anode chamber and the cathode chamber are separated through a cation exchange membrane; graphite particles are uniformly distributed in the anode chamber and the cathode chamber; an anode electrode is modified through a high-performance catalytic oxygen-producing material; and a cathode electrode is modified through a high-performance catalytic hydrogen-producing material. The device for removing PCBs in bottom mud through utilizing the device comprises the steps of (1) inoculating the anode chamber with bottom mud containing aerobic dehalogenation bacteria, adding low PCBs, an electron donor and a nutrient solution; (2) inoculating the cathode chamber with mixed sludge containing anaerobic dechlorinating bacteria, and adding high PCBs; and (3) connecting an external circuit, and starting an operation device, so as to synchronously degrade PCBs through anaerobic-aerobic coupling. According to the method, operation is simple, economy and applicability are achieved, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of microbial degradation of polychlorinated biphenyls, in particular to a method and a device for removing polychlorinated biphenyls in sediment by coupling cathode anaerobic / anodic aerobic stimulation with micro-electric fields. Background technique [0002] Polychlorinated Biphenyls (PCBs for short) are a class of chlorinated aromatic hydrocarbons produced by chlorinating hydrogen atoms on biphenyls through chemical catalytic reactions. There are 209 homologues (PCB1~PCB209), of which The chemical expression is C 12 h 10-n Cl n , PCBs have excellent physical and chemical properties such as thermodynamic stability, non-flammability, and chemical inertness. They have been widely used in the fields of electric power processing, plastic processing, chemical industry, and printing. Later, it was found to have immunotoxicity, neurotoxicity, developmental toxicity and "three causes" characteristics. PCBs have ...

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Problems solved by technology

[0005] There are many types of methods for PCBs pollution control, all of which have certain limitations: physical incineration requires high equipment and will cause secondary pollution (production of dioxin and other substances); chemical catalysis requires expensive catalysts and complicated operations The limitations of microbial remediation are strong dependence on environmental conditions, slow degradation and insufficient thoroughness

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