期刊
BIORESOURCE TECHNOLOGY
卷 150, 期 -, 页码 249-258出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.10.002
关键词
Thermophilic; Anaerobic co-digestion; Coffee grounds; Sludge; Membrane reactor
资金
- Japan Society for the Promotion of Science [24-02053]
- Ministry of Science and Technology of China [2010DFA22770]
- Grants-in-Aid for Scientific Research [12F02053] Funding Source: KAKEN
Coffee grounds are deemed to be difficult for degradation by thermophilic anaerobic process. In this research, a 7 L AnMBR accepting coffee grounds was operated for 82 days and failed with pH dropping to 6.6. The deficiency of micronutrients in the reactor was identified. The system was recovered by supplying micronutrient, pH adjustment and influent ceasing for 22 days. In the subsequent 160 days of co-digestion experiment, waste activated sludge (15% in the mixture) was mixed into coffee grounds. The COD conversion efficiency of 67.4% was achieved under OLR of 11.1 kg-COD/m(3) d and HRT of 20 days. Tannins was identified affecting protein degradation by a batch experiment. Quantitative supplements of NH4HCO3 (0.12 g-N/g-TSm) were effective to maintain alkalinity and pH. The solid concentration in the AnMBR reached 75 g/L, but it did not significantly affect membrane filtration under a flux of 5.1 L/m(2) h. Soluble carbohydrate, lipid and protein were partially retained by the membrane. (C) 2013 Elsevier Ltd. All rights reserved.
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