《Table 1–Main characteristics of raw sludge, seed sludge and sludge mixture.》

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《A strategy for enhancing anaerobic digestion of waste activated sludge: Driving anodic oxidation by adding nitrate into microbial electrolysis cell》

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Waste active sludge（WAS）collected from a municipal wastewater treatment plant（Dalian，China）was used as the substrate in this study.The collected sludge was stored at 4°C for use.Inoculum seed sludge was collected from an anaerobic digester of an industrial wastewater treatment plant of Dalian（China）.The seed sludge was cultured in the laboratory with a batch anaerobic digester（5 L working volume）before experiment.The operating conditions were consistent with previously described by Zhao et al.（2016a）.The sludge mixture for digestion consisted of seed sludge and WAS with a volume ratio of 1:9.The main characteristics of raw sludge，seed sludge and sludge mixture are listed in Table 1.