Improvement of methane production from waste activated sludge by on-site photocatalytic pretreatment in a photocatalytic anaerobic fermenter.
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 4h per day. After anaerobic digestion for 35days, 1266.7ml/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 923.2ml/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.
['Liu|Chunguang|C|', 'Shi|Wansheng|W|', 'Li|Huifang|H|', 'Lei|Zhongfang|Z|', 'He|Leilei|L|', 'Zhang|Zhenya|Z|']
D001421:Bacteria, Anaerobic D057919:Biological Oxygen Demand Analysis D002384:Catalysis D005285:Fermentation D008697:Methane D008956:Models, Chemical D055668:Photochemical Processes D012722:Sewage D014025:Titanium D014865:Waste Disposal, Fluid
Activated sludge Anaerobic fermenter Methane fermentation On-site pretreatment TiO(2) photocatalysis