Improvement of coffee grounds high solid thermophilic methane fermentation by co-digestion with in-situ produced waste activated sludge: Performance and stability
Improvement of coffee grounds high solid thermophilic methane fermentation by co-digestion with in-situ produced waste activated sludge: Performance and stability
复制标题
与原位产生的废活性污泥共消化改进咖啡渣高固体嗜热甲烷发酵：性能和稳定性
DOI：
10.1016/j.scitotenv.2020.142551
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发表时间：
2021
影响因子：
9.8
通讯作者：
Li Yu-You
中科院分区：
文献类型：
--
作者：
Zhang Tao;Tonouchi Kazuki;Kong Zhe;Li Yemei;Cheng Hui;Qin Yu;Li Yu-You
研究了咖啡渣与剩余活性污泥共消化过程中原位稳定化的可行性。两个实验室规模的嗜热连续搅拌釜反应器（CSTR），R1和R2与含有不同的WAS比例，S1（WAS% = 20%）和S2（WAS% = 30%）的基板进行操作。在整个过程中，没有外部供应的氨和微量元素。R1和R2的挥发性固体（VS）去除效率相当，R1的产气率（0.467 ± 0.100 L/g-VSin）略高于R2（0.408 ± 0.020 L/g-VSin）。R1和R2的总氨氮（TAN）分别为482 ± 32和884 ± 24 mg/L。建立了共消化的化学计量公式，计算了理论微生物产率系数和微生物繁殖要求。理论要求和实验值之间的比较表明，与WAS共消化可以避免对矿物的外部供应的供应。对于净发电量，R1和R2每天分别可以产生6342和5069 kWh的电力。
The feasibility of in-situ stabilization in the co-digestion of coffee grounds (CG) and waste activated sludge (WAS) was investigated. Two lab-scale thermophilic continuous stirred tank reactors (CSTR), R1 and R2 were operated with substrates that contained different WAS ratios, S1 (WAS% = 20%) and S2 (WAS% = 30%). During the whole process, there was no external supply of ammonia and trace elements. The volatile solid (VS) removal efficiency of R1 and R2 was comparable, and the biogas yield of R1 (0.467 ± 0.100 L/g-VSin) was slightly higher than R2 (0.408 ± 0.020 L/g-VSin). The total ammonia nitrogen (TAN) of R1 and R2 was 482 ± 32 and 884 ± 24 mg/L, respectively. The stoichiometry formulas of co-digestion were established to calculate the theoretical microbial yield coefficients and the requirements of microorganism reproduction. A comparison between the theoretical requirements and experimental values showed that co-digestion with WAS could avoid supply for an external supply of minerals. For the net energy production, R1 and R2 could generate 6342 and 5069 kWh of electricity daily, respectively.