International S&T Cooperation Center for Urban Alternative Water Resources Development, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China.
Department of Fermentation Science, Faculty of Applied Bio-Science, Tokyo University of Agriculture, 1-1 Sakuragaoka 1-chome, Setagaya-ku, Tokyo 156-8502, Japan.
Bioresour Technol. 2019 Feb;274:127-133. doi: 10.1016/j.biortech.2018.11.080. Epub 2018 Nov 23.
A large amount of wastewater is generated in the processing of coffee from fruit to cup. Thermophilic high-solids co-digestion of coffee processing wastewater (CPW) and waste activated sludge (WAS) has been succeeded by anaerobic membrane bioreactor (AnMBR). Chemical oxygen demand (COD) removal efficiencies of 92 ± 3% with an average methane yield of 0.28 LCH/gCOD were achieved at a high solids content of 50 g/L in the AnMBR. The optimal digestion performance of 82.4% removal COD conversion to CH was achieved at hydraulic retention time (HRT) 10 d. Energy balance analysis revealed AnMBR has succeeded in energy positive at all the HRTs. The net energy potential (NEP) was determined to average 2.12-2.82 kJ/gCOD, amongst which the maximum NEP was achieved at HRT 15 d. These results indicated the high-solids co-digestion by AnMBR is a promising approach to maximize the bioenergy conversion from the co-substrate of CPW and WAS.
从水果到杯子，咖啡加工过程中会产生大量废水。厌氧膜生物反应器（AnMBR）已经成功实现了咖啡加工废水（CPW）和废活性污泥（WAS）的嗜热高固体共消化。在 AnMBR 中，固体含量为 50g/L 时，COD 去除效率达到 92±3%，平均甲烷产量为 0.28LCH/gCOD。在水力停留时间（HRT）为 10d 时，达到了最佳的消化性能，COD 转化率为 CH 的 82.4%。能量平衡分析表明，在所有 HRT 下，AnMBR 都成功实现了能量正平衡。净能量潜力（NEP）平均为 2.12-2.82kJ/gCOD，其中在 HRT 为 15d 时达到最大值。这些结果表明，AnMBR 的高固体共消化是一种很有前途的方法，可以最大限度地从 CPW 和 WAS 的共底物中转化生物能源。
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