Anaerobic digestion in mesophilic and room temperature conditions: Digestion performance and soil-borne pathogen survival

文献类型： 外文期刊

第一作者： Chen, Le

作者： Chen, Le;Jian, Shanshan;He, Jian;Ye, Xiaomei;Chen, Le;Bi, Jinhua;Li, Yunlong;Chang, Zhizhou;Ye, Xiaomei;Chang, Zhizhou;Ye, Xiaomei

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关键词： Anaerobic digestion;Pathogen inactivation;Digestion performance;Fruit and vegetable wastes

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

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收录情况： SCI

摘要： Tomato plant waste (TPW) was used as the feedstock of a batch anaerobic reactor to evaluate the effect of anaerobic digestion on Ralstonia solanacearum and Phytophthora capsici survival Batch experiments were caned out for TS (total solid) concentrations of 2%, 4% and 6% respectively, at mesophilic (37 +/- 1 degrees C) and room (20-25 degrees C) temperatures. Results showed that higher digestion performance was achieved under mesophilic digestion temperature and lower TS concentration conditions. The biogas production ranged from 71 to 416 L/kg VS (volatile solids). The inactivation of anaerobic digestion tended to increase as digestion performance improved. The maximum log copies reduction of R. solanacearum and P. capsici detected by quantitative PCR (polyrnerase chain reaction) were 3.80 and 4.08 respectively in reactors with 4% TS concentration at mesophilic temperatures. However, both in mesophilic and room temperature conditions, the lowest reduction of R. solanacearum was found in the reactors with 6% TS concentration, which possessed the highest VFA (volatile fatty acid) concentration. These findings indicated that simple accumulation of VFAs failed to restrain R. solanacearum effectively, although the VFAs were considered poisonous. P. capsici was nearly completely dead under all conditions. Based on the digestion performance and the pathogen survival rate, a model was established to evaluate the digestate biosafety. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

分类号： X5

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