TY - JOUR
T1 - Enhancing methane production from anaerobic digestion of secondary sludge through lignosulfonate addition
T2 - Feasibility, mechanisms, and implications
AU - Wang, Zhenyao
AU - Li, Xuan
AU - Liu, Huan
AU - Zhou, Ting
AU - Li, Jibin
AU - Siddiqui, Muhammad Ahmar
AU - Lin, Carol Sze Ki
AU - Rafe Hatshan, Mohammad
AU - Huang, Siyu
AU - Cairney, Julie M.
AU - Wang, Qilin
PY - 2023/12
Y1 - 2023/12
N2 - This study explores the feasibility of using lignosulfonate, a byproduct of the pulp and paper industry, to facilitate sludge anaerobic digestion. Biochemical methane potential assays revealed that the maximum methane production was achieved at 60 mg/g volatile solids (VS) lignosulfonate, 22.18 % higher than the control. One substrate model demonstrated that 60 mg/g VS lignosulfonate boosted the hydrolysis rate, biochemical methane potential, and degradation extent of secondary sludge by 19.12 %, 21.87 %, and 21.11 %, respectively, compared to the control. Mechanisms unveiled that lignosulfonate destroyed sludge stability, promoted organic matter release, and enhanced subsequent hydrolysis, acidification, and methanogenesis by up to 31.30 %, 74.42 % and 28.16 %, respectively. Phytotoxicity assays confirmed that lignosulfonate promoted seed germination and root development of lettuce and Chinese cabbage, with seed germination index reaching 170 ± 10 % and 220 ± 22 %, respectively. The findings suggest that lignosulfonate addition offers a sustainable approach to sludge treatment, guiding effective management practices. © 2023 Elsevier Ltd
AB - This study explores the feasibility of using lignosulfonate, a byproduct of the pulp and paper industry, to facilitate sludge anaerobic digestion. Biochemical methane potential assays revealed that the maximum methane production was achieved at 60 mg/g volatile solids (VS) lignosulfonate, 22.18 % higher than the control. One substrate model demonstrated that 60 mg/g VS lignosulfonate boosted the hydrolysis rate, biochemical methane potential, and degradation extent of secondary sludge by 19.12 %, 21.87 %, and 21.11 %, respectively, compared to the control. Mechanisms unveiled that lignosulfonate destroyed sludge stability, promoted organic matter release, and enhanced subsequent hydrolysis, acidification, and methanogenesis by up to 31.30 %, 74.42 % and 28.16 %, respectively. Phytotoxicity assays confirmed that lignosulfonate promoted seed germination and root development of lettuce and Chinese cabbage, with seed germination index reaching 170 ± 10 % and 220 ± 22 %, respectively. The findings suggest that lignosulfonate addition offers a sustainable approach to sludge treatment, guiding effective management practices. © 2023 Elsevier Ltd
KW - Biochemical methane potential
KW - Lignosulfonate
KW - One substrate model
KW - Phytotoxicity tests
KW - Secondary sludge
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85174149635&origin=recordpage
U2 - 10.1016/j.biortech.2023.129868
DO - 10.1016/j.biortech.2023.129868
M3 - RGC 21 - Publication in refereed journal
SN - 0960-8524
VL - 390
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 129868
ER -
