▎ 摘　　要

Coal gasification wastewater (CGW) contains high concentration phenols which lead to poor anaerobic biodegradability and resource utilization. In this paper, newinsights to improve synthetic CGWanaerobic degradation with the help of graphene under co-digestion conditionswere investigated. Batch tests showed thatwith the addition of graphene dosage of 10 g/L and glucose as a co-substrate with chemical oxygen demand (COD) concentration of 2000mg/L, the average COD concentration decreased from3995mg/L on day 1 to 983 mg/L on day 12. The average total phenol (TP) concentration decreased from431 mg/L on day 1 to 23 mg/L on day 12. The cumulative methane production for 12 days was about 200 mL. Long-term experiments showed the average effluent COD and total phenol reached 1137 mg/L and 200 mg/L, respectively. While methane production stabilized at 500 mL/d. In addition, the coenzyme F420 concentration increased from 1.075 mu mol/g/VSS to 2.3 mu mol/g/VSS. The analysis of microbial community structure indicated that the performance of phenols removal and methane production was related to the main microbial flora. The enriched Clostridium, Pseudomonas and species from Firmicutes and Chloroflexi participated in the stages of hydrolysis and acidogenesis. The electrogens Pseudomonas and archaea Methanosaeta were likely the major groups taking part in the direct interspecies electron transfer (DIET). The results obtained in this paper provide a theoretical basis for high-efficiency anaerobic degradation of CGWin practical engineering applications. (C) 2020 Elsevier B.V. All rights reserved.