石墨烯气凝胶强化氯霉素废水厌氧生物处理效能及机制研究

Aiming at the problems of refractory to biodegradation, high toxicity and inhibiting the activity of activated sludge in the actual anaerobic biological treatment of high-concentration chloramphenicol (CAP) wastewater, the three-dimensional graphene aerogel (GA) was used as an exogenous strengthening mediator to enhance the anaerobic degradation performance of chloramphenicol wastewater. The concentration of different initial graphene aerogel, electron donor (sucrose) and chloramphenicol were explored through batch experiments to clarify their influence on the removal rate of chloramphenicol and organic matter and the cumulative production of methane. The results showed that the strengthening effect was most significant when the initial graphene aerogel concentration was 0.5 g•L^-1, the initial electron donor concentration was 8.8 mmol•L^-1, and the initial chloramphenicol concentration was 50 mg•L^-1. When the reaction proceeded to 18 hours, the removal rate of chloramphenicol in the system was above 94%, and COD removal stabilized between 26.6%~35.6%. Compared with the biological system only with sludge, the removal rate of chloramphenicol in the enhanced system was increased by 48.0%~51.6%. COD removal rate increased by about 10.0%. Analysis believed that graphene aerogel, as an electron transfer intermediate and a carrier for microbial enrichment, promoted direct electron transfer between microbes, accelerated the dechlorination process of chloramphenicol and the production of methane. It provided new treatment ideas and references for the anaerobic biological treatment of high-concentration antibiotic wastewater.