Evaluation of a carbon felt amended anaerobic baffled reactor for rural blackwater treatment
WEN Cang-xiang1,2, DAI Zhe-qin1,3, ZHA Xiao4, CHENG Fang-kui1,2, CHENG He-lai1,2, CAI Qing-xiu1,2, LU Xi-wu1,2
1. School of Energy and Environment, Southeast University, Nanjing 210096, China; 2. ERC Taihu Lake Water Environment (Wuxi), Southeast University, Wuxi 214135, China; 3. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212018, China; 4. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Abstract：This study assessed the ability of a carbon-felt amended anaerobic baffled reactor to treat blackwater (separately collected toilet wastewater) at ambient temperature, gradually shortening the hydraulic retention time (HRT) to explore its maximum performance. The results showed that under conditions of HRT at 1.45d and an organic loading rate of 2.94kg COD/m≥/d, the maximum methane yield achieved was (417±59) NL CH/(m3×d), with a methanization rate of (40.5±5.02) % and a total COD removal rate of (79.08±7.24) %. The addition of carbon felt specifically enriched the genus Methanospirillum, realizing high efficiency through the domination of hydrogenotrophic methanogenesis pathway. This reactor demonstrated excellent organic matter treatment efficiency, high methane yield, and high-quality biogas at room temperature. The effluent contained a larger proportion of nutrients that plants can directly absorb, with the advantage of being simple-to-operate and easy-to-maintain, showing good potential for practical application in rural areas.
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