期刊
BIORESOURCE TECHNOLOGY
卷 173, 期 -, 页码 317-323出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.09.128
关键词
EGSB; MSW leachate; Biogas recirculation; Calcium removal; Biogas purification
资金
- National Science Foundation of China [21377079]
- Program for Innovative Research Team in University [IRT13078]
Biogas, generated from an expanded granular sludge bed (EGSB) reactor treating municipal solid waste (MSW) leachate, was recirculated for calcium removal from the leachate via a carbonation process with simultaneous biogas purification. Batch trials were performed to optimize the solution pH and imported biogas (CO2) for CaCO3 precipitation. With applicable pH of 10-11 obtained, continuous trials achieved final calcium concentrations of 181-375 mg/L (removal efficiencies approximate to 92.8-96.5%) in the leachate and methane contents of 87.1-91.4% (purification efficiencies approximate to 65.4-82.2%) in the biogas. Calcium-balance study indicates that 23-986 mg Ca/d was released from the bio-system under the carbonized condition where CaCO3 precipitating was moved outside the bioreactor, whereas 7918-9517 mg Ca/d was trapped into the system for the controlled one. These findings demonstrate that carbonation removal of calcium by biogas recirculation could be a promising alternative to pretreat calcium-rich MSW leachate and synergistically to improve methane content. (C) 2014 Elsevier Ltd. All rights reserved.
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