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Anaerobic digestion of alkaline black liquor using an up‐flow anaerobic sludge blanket reactor
Author(s) -
Dangcong Peng,
Qiting Jin
Publication year - 1993
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280580113
Subject(s) - pulp and paper industry , anaerobic digestion , chemistry , black liquor , blanket , settling , anaerobic exercise , lignin , activated sludge , waste management , bioreactor , sewage treatment , environmental science , environmental engineering , materials science , biology , methane , organic chemistry , composite material , physiology , engineering
The anaerobic digestion of alkaline black liquor from a cereal straw pulping mill was studied in batch (serum bottles) and continuous systems (up‐flow anaerobic sludge blanket reactor—UASB). The batch digestion studies confirmed that lignin and related compounds (LRC) in the alkaline black liquor were the main inhibitory substances and could not be decomposed by anaerobic bacteria. At organic loading rates of 5–10 kg COD m −3 day −1 , the UASB reactor achieved 50–60% COD removal efficiencies. Gas production was 2–3 dm 3 per dm 3 of alkaline black liquor. Two different sludge types were examined in the reactor: granular and cluster‐like sludges. Sludge in a cluster, which involved many small granules and flocs, tended to form larger aggregates and possessed good settling ability.