In this experiment, the toxicity of wastewater under different organic loads is studied, and the detoxification of three-dimensional electrolysis technology is investigated. The experimental results show that with the increase of organic loads, the inhibitory degree of methanogenic activity is gradually enhanced and the COD removal rate is sharply reduced. The inhibition rate of methanogenic process reaches 38.2% at 4 g COD/L. Combining with the high-throughput sequencing technology, the analysis of bacteria and archaea during fermentation reveals that the microbial community structure is significantly affected before and after fermentation. After the pretreatment of wood vinegar by the optimized three-dimensional electrolysis conditions （electrolysis time 90 min, voltage 5 V, pH=6, iron and carbon concentration 140 g/L）, the methane yield at 4 g COD/L of wood vinegar increases from 223.1 mL/g COD to 344.2 mL/g COD, and the inhibition rate decreased to 11.2%. In summary, three-dimensional electrolysis has an obvious effect on improving the bioavailability and anaerobic fermentation efficiency of wood vinegar.
Key words
anaerobic digestion /
toxicity /
wastewater treatment /
wood vinegar /
three-dimensional electrolysis /
microbial community
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