Photocatalytic pretreatment for the redox conversion of waste activated sludge to enhance biohydrogen production

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• 作者：Chunguang Liu ; Wansheng Shi ; Mijung Kim ; Yingnan Yang ; Zhongfang Lei ; Zhenya Zhang ; ^{zhang.zhenya.fu@u.tsukuba.ac.jp}
• 关键词：Waste activated sludge ; Photocatalytic pretreatment ; Redox conversion ; Anaerobic hydrogen production ; Heavy metals
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：18 June, 2013
• 年：2013
• 卷：38
• 期：18
• 页码：7246-7252
• 全文大小：541 K

文摘

Photocatalytic pretreatment of waste activated sludge (WAS) using a flat photocatalytic reactor was undertaken. Photocatalytic pretreatment enhanced the release of soluble substances from WAS, in which the soluble protein and soluble carbohydrate concentration increased by about 50 % and 80 % , respectively. Significant removal of heavy metal ions from the liquid phase of WAS was also achieved after photocatalytic pretreatment. In addition, the highest hydrogen yield and the highest concentration of volatile fatty acids (VFAs) were achieved from the photocatalysis pretreated WAS by batch anaerobic digestion (55?¡ãC). The cumulative hydrogen yield from photocatalysis pretreated WAS was 211.0?ml/l-sludge, much higher than those from UV pretreated WAS (111.0?ml/l-sludge) and from raw WAS (93.0?ml/l-sludge). The results indicate that photocatalysis is a promising WAS pretreatment method for the enhancement of biohydrogen production, probably due to the?photo-oxidation of organics and simultaneous photo-reduction of heavy metal ions in?WAS.