Improvement of methane production from waste activated sludge by on-site photocatalytic pretreatment in a photocatalytic anaerobic fermenter

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• 作者：Chunguang Liu ; Wansheng Shi ; Huifang Li ; Zhongfang Lei ; Leilei He ; Zhenya Zhang ; ^{zhang.zhenya.fu@u.tsukuba.ac.jp" class="auth_mail}
• 关键词：Activated sludge ; Anaerobic fermenter ; On-site pretreatment ; TiO2 photocatalysis ; Methane fermentation
• 刊名：Bioresource Technology
• 出版年：March, 2014
• 年：2014
• 卷：155
• 期：Complete
• 页码：198-203
• 全文大小：578 K

文摘

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, 1266.7 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.