Abstract：
:This study evaluated the effectiveness of biochar addition against high organic loading shock (OLS) of 80 kg COD/m3/d in up-flow anaerobic sludge blanket (UASB) reactors (R1 with biochar; R2 without biochar). After OLS of 24 h, R2 suffered the irreversible acidification (pH of 5.42 ± 0.07) with low biogas production of 0.08 ± 0.01 m3/kg COD/d. In contrast, the biogas production in R1 restored rapidly to 0.33 ± 0.04 m3/kg COD/d, and effluent pH in R1 returned to 7.01 ± 0.22. With addition of biochar, potential direct interspecies electron transfer (DIET) partners, including volatile fatty acids (VFAs)-oxidizing bacteria (Bacteroidetes, Smithella, Desulfovibrio, Geobacter) and methanogens (Methanosaeta, Methanosarcina) were enriched in R1, which were conductive to maintain the balance of acidogenesis and methanogenesis. Moreover, the retention of Methanosaeta and Methanosarcina coupled with biochar maintained the structural stability of granular sludge in R1 under the pressure of OLS and VFAs, which guaranteed the stability of anaerobic system.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Wang C,Liu Y,Wang C,Xing B,Zhu S,Huang J,Xu X,Zhu Ldoi
10.1016/j.biortech.2020.124360subject
Has Abstractpub_date
2021-01-01 00:00:00pages
124360issue
Pt Aeissn
0960-8524issn
1873-2976pii
S0960-8524(20)31634-5journal_volume
320pub_type
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