期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 307, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.114538
关键词
Acidified digester; Methanogenic recovery; Alkaline treatment; Biochar; VFA degradation
资金
- Office of the Higher Education Commission
- Thailand Research Fund (TRF)
- National Research Council of Thailand (NRCT) [MRG6280191]
- Mahidol University
This study investigates the treatment of a complex and high-strength digestate using biochar and calcium hydroxide, which successfully decomposed excessive volatile fatty acid and resumed methane production. The results show that the digester amended with biochar achieved the highest methane yield.
Commercial digesters handling complex waste and organic overloading often encounter unbalanced conditions or failures. With limited studies on the digester recovery from an industry-based waste stream, a complex and high-strength digestate containing up to 79 g COD l(-) (1) from acidified commercial digester was investigated for biochar and alkaline treatments. The addition of biochar and calcium hydroxide successfully decomposed excessive volatile fatty acid up to 18.9 +/- 2.5 g l(- 1) and resumed methane production. The maximum methane yield was obtained from the digester amended with biochar (373.4 +/- 6.0 ml g COD-(1)), followed by calcium hydroxide (350.1 +/- 2.5 ml g COD-1). Calcium hydroxide treatment showed a shorter lag phase than the biochar by 44%. Methane production could not be recovered by using sodium hydroxide or untreated digester. This study provides a strategic approach to justify the use of alkalis for restoring sour digesters from industry-based waste streams.
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