Journal
BIORESOURCE TECHNOLOGY
Volume 155, Issue -, Pages 198-203Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.12.041
Keywords
Activated sludge; Anaerobic fermenter; On-site pretreatment; TiO2 photocatalysis; Methane fermentation
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This paper reports a new technology that using on-site TiO2-photocatalytic pretreatment in the anaerobic digestion of waste activated sludge (WAS) can enhance WAS degradation and methane production in a novel photocatalytic anaerobic fermenter. The fermenter consists of a photocatalytic unit and a digestion unit. The photocatalytic unit can constantly supply soluble organics and has less negative effect on the activity of methanogens at the optimal photocatalytic time of 4 h per day. After anaerobic digestion for 35 days, 12667 ml/l-sludge of methane, 67.4% of volatile solid (VS) reduction and 60.5% of total chemical oxygen demand (TCOD) removal were achieved in the photocatalytic anaerobic fermenter, compared with 923.2 ml/l-sludge of methane, 48.9% of VS reduction and 43.5% TCOD removal in the control fermenter. The results indicate that timely utilization of solubilized organics by methanogens could avoid further mineralization by TiO2-photocatalysis, which not only improves methane production but also enhances WAS degradation. (C) 2013 Elsevier Ltd. All rights reserved.
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