Method for high-efficiency degradation of p-chloronitrobenzene through microbial electrocatalysis

Abstract

The invention discloses a method for high-efficiency degradation of p-chloronitrobenzene through microbial electrocatalysis. The method comprises the following steps: carrying out single-chamber longitudinal domestication on electrochemically active microorganisms; placing inoculated sludge and a culture medium in an anaerobic bottle, and carrying out gradient domestication and enrichment on p-chloronitrobenzene degrading bacteria; reconstructing a single chamber to form double chambers; adding an anodic water feeding base fluid into an anode chamber, taking out a domestication fluid from theanaerobic bottle, adding the domestication fluid into a cathode chamber, then adding a medium fluid, connecting an external resistor and an external power source to form a closed loop, thereby completing starting of a double-chamber microbial electrocatalysis apparatus, wherein anodes are allowed to enrich the electrochemically active microorganisms and cathodes are allowed to enrich p-chloronitrobenzene bacteria with specific functions; and oxidizing carbon sources in the anode chamber and the cathode chamber under the action of electrochemically active bacteria so as to release electrons, wherein electrons in the anode chamber reach the cathodes via an external circuit and are transferred to p-chloronitrobenzene, and electrons released through oxidation in the cathode chamber are also transferred to p-chloronitrobenzene. The method provided by the invention realizes high-efficiency degradation of p-chloronitrobenzene.

Description

technical field [0001] The invention belongs to the fields of environmental application technology and environmental protection, and more specifically relates to a method for efficiently degrading p-chloronitrobenzene by microbial electrocatalysis. Background technique [0002] p-Chloronitrobenzene is a class of aromatic hydrocarbon compounds containing chlorine and nitro groups. It is an important intermediate product in the industrial production of azo dyes and sulfur dyes. It is widely used in the production process of rubber, pesticides, medicine, pharmaceuticals, photography and military materials. middle. Under the combined action of electron-withdrawing groups (nitro and chlorine), the electron cloud density of the benzene ring itself is reduced, the inductive effect is enhanced, the chemical structure is stable, and it is difficult to degrade. Compounds with typical "three-induced" effects and genotoxicity are listed as persistent toxic and refractory organic substa...

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Problems solved by technology

[0004] At present, the treatment methods of p-chloronitrobenzene mainly include: 1) physical method: adsorption and extraction, only the transfer of pollutants, and there is secondary pollution of adsorbent and extractant; 2) chemical method: advanced oxidation method, zero price Iron reduction technology and electrochemical reduction technology, which require large equipment investment and high treatment costs; 3) Biological method: anaerobic method, anaerobic-aerobic combined technology, which has the characteristics of slow degradation rate and long treatment cycle

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