State Key Laboratory of Heavy Oil Processing, China University of Petroleum, PR China; Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Japan.
Bioresour Technol. 2013 Dec;149:92-102. doi: 10.1016/j.biortech.2013.09.023. Epub 2013 Sep 13.
The performance of thermophilic anaerobic co-digestion of coffee grounds and sludge using membrane reactor was investigated for 148 days, out of a total research duration of 263 days. The OLR was increased from 2.2 to 33.7 kg-COD/m(3)d and HRT was shortened from 70 to 7 days. A significant irreversible drop in pH confirmed the overload of reactor. Under a moderately high OLR of 23.6 kg-COD/m(3)d, and with HRT and influent total solids of 10 days and 150 g/L, respectively, the COD removal efficiency was 44.5%. Hydrogen in biogas was around 100-200 ppm, which resulted in the persistent propionate of 1.0-3.2g/L. The VFA consumed approximately 60% of the total alkalinity. NH4HCO3 was supplemented to maintain alkalinity. The stability of system relied on pH management under steady state. The 16SrDNA results showed that hydrogen-utilizing methanogens dominates the archaeal community. The propionate-oxidizing bacteria in bacterial community was insufficient.
采用膜生物反应器对咖啡渣和污泥进行高温厌氧共消化的性能进行了 148 天的研究，总研究时间为 263 天。OLR 从 2.2 增加到 33.7kg-COD/m(3)d，HRT 从 70 天缩短到 7 天。pH 值的显著不可逆下降证实了反应器的过载。在适度高的 OLR 为 23.6kg-COD/m(3)d，HRT 和进水总固体分别为 10 天和 150g/L 的条件下，COD 去除效率为 44.5%。沼气中的氢气约为 100-200ppm，导致持续的丙酸为 1.0-3.2g/L。VFA 消耗了大约 60%的总碱度。NH4HCO3 被补充以维持碱度。系统的稳定性依赖于稳定状态下的 pH 值管理。16SrDNA 结果表明，利用氢的产甲烷菌主导了古菌群落。细菌群落中丙酸氧化菌不足。
