Key Laboratory of Water and Sediment Sciences of Ministry of Education,; State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
Bioresour Technol. 2013 Dec;149:346-52. doi: 10.1016/j.biortech.2013.09.080. Epub 2013 Sep 29.
Effects of CeO2-NPs on anaerobic fermentation were investigated from the processes of acidification and methanation with anaerobic granule sludge and anaerobic flocculent sludge as the targets. Results showed that acidification process was more sensitive to CeO2-NPs than methanation process. Both types of sludge produced less short-chain fatty acid compared to the control, with a reduction of 15-19% for the flocculent sludge at the dosage of 5, 50 and 150 mg CeO2-NPs/g-VSS, and a reduction of 35% for the granular sludge at 150 mg CeO2-NPs/g-VSS. CeO2-NPs caused no inhibition to methanation process. Most of CeO2-NPs distributed on the surface of sludge as revealed by fluorescence labeled CeO2-NPs. The toxicity of CeO2-NPs to anaerobic sludge did not result from reactive oxygen species. Physical penetration and membrane reduction may be important toxic mechanisms.
采用厌氧颗粒污泥和絮状污泥作为研究对象，从酸化和产甲烷过程考察 CeO2-NPs 对厌氧发酵的影响。结果表明，酸化过程比产甲烷过程对 CeO2-NPs 更敏感。与对照组相比，两种类型的污泥产生的短链脂肪酸都较少，在 5、50 和 150mg CeO2-NPs/g-VSS 投加量下，絮状污泥的短链脂肪酸减少了 15-19%，在 150mg CeO2-NPs/g-VSS 投加量下，颗粒污泥的短链脂肪酸减少了 35%。CeO2-NPs 对产甲烷过程没有抑制作用。荧光标记的 CeO2-NPs 表明，CeO2-NPs 大部分分布在污泥表面。CeO2-NPs 对厌氧污泥的毒性不是由于活性氧引起的。物理穿透和膜还原可能是重要的毒性机制。
