Journal
BIORESOURCE TECHNOLOGY
Volume 347, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.126688
Keywords
Tar solution; Gasification; Anaerobic digestion; Biochar; Hybrid reactor
Funding
- Japan Society for Promotion of Science (JSPS) [19F19099]
- Grants-in-Aid for Scientific Research [19F19099] Funding Source: KAKEN
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A hybrid reactor was established for tar treatment, and the addition of biochar improved methane production, relieved the inhibition caused by tar, and promoted the growth of some microbes.
Tar generated as a by-product during biomass gasification contains a high concentration of refractory organic matters. In this study, a hybrid upflow anaerobic sludge-biochar bed reactor was established for tar treatment, and the methane yield was 120-154 NmL-CH4/g-CODinf, 20-30% higher than the control reactor. COD removal and methane production significantly decreased in both reactors when the influent tar concentration was doubled from 4954 mg-COD/L to 9964 mg-COD/L. When the influent concentration was reduced, the biochar packed reactor showed a faster recovery. Batch tests confirmed that higher tar concentration inhibited methane production and induced longer lagphase. Biochar addition effectively relieved the inhibition and prolonged the retention of organic matters. SEM observation and 16S rRNA analysis suggested that biochar also acted as the microbe's carrier, and promoted the growth of some microbes. The results of this study provide new ideas for tar treatment.
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