期刊
JOURNAL OF BIOTECHNOLOGY
卷 175, 期 -, 页码 22-30出版社
ELSEVIER
DOI: 10.1016/j.jbiotec.2014.01.030
关键词
Biogas; Anaerobic digestion; Thin stillage; Ammonium; Hydeogen sulphide; Temperature
资金
- Tekniska verken i Linkping AB(publ.)
- Swedish Research Council Formas and formed partof the thematic research programme MicroDrivE at the Swedish University of Agricultural Sciences
The effect of increasing organic loading rate (OLR) and simultaneously decreasing hydraulic retentiontime (HRT) during anaerobic digestion of sulphur-and nitrogen-rich thin stillage was investigated duringoperation of continuously stirred tank laboratory reactors at two different temperatures. The operatingstrategies and substrate were set in order to mimic an existing full-scale commercial biogas plant inSweden. The reactors were operated for 554-570 days with a substrate mixture of thin stillage andmilled grain, resulting in high ammonium concentrations (> 4.5 g L-1). Initially, one reactor was operatedat 38. C, as in the full-scale plant, while in the experimental reactor the temperature was raised to 44. C. Both reactors were then subjected to increasing OLR (from 3.2 to 6.0 g VS L-1d-1) and simultaneouslydecreasing HRT (from 45 to 24 days) to evaluate the effects of these operational strategies on processstability, hydrogen sulphide levels and microbial composition. The results showed that operation at44. C was the most successful strategy, resulting in up to 22% higher methane yield compared with themesophilic reactor, despite higher free ammonia concentration. Furthermore, kinetic studies revealedhigher biogas production rate at 44. C compared with 38. C, while the level of hydrogen sulphide wasnot affected. Quantitative PCR analysis of the microbiological population showed that methanogenicarchaea and syntrophic acetate-oxidising bacteria had responded to the new process temperature whilesulphatereducing bacteria were only marginally affected by the temperature-change. (C) 2014 Elsevier B. V. All rights reserved.
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