Transformation of organic matters in fresh leachate during anaerobic degradation under long hydraulic retention time

作     者：XU Suyun,HE Pinjing,LU Fan,LI Min,SHAO Liming State Key Laboratory of Pollution Control and Resources Reuse,Key Laboratory of Yangtze River Water Environment,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China 

作者机构：[a]State Key Laboratory of Pollution Control and Resources Reuse Key Laboratory of Yangtze River Water Environment College of Environmental Science and Engineering Tongji University Shanghai 200092 China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2009年第21卷第9期

页      面：1302-1308页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(No.50538080) the Hi-Tech Research and Development Program (863) of China(No. 2008AA062101) 

主　　题：biodegradability biomass lyses methane production ratio of inoculum to substrate volatile fatty acids 

摘      要：This study investigated the biodegradability of fresh leachate from a young municipal solid waste landfill at the inoculum to substrate ratios （V/V） of 10/100, 25/100, 50/100 and 100/100, as well as the transformation of organic matters in leachate under prolonged hydraulic retention time （HRT） of 50 d. Fresh leachate showed a good biodegradability, with chemical oxygen demand （COD） removal efficiency as high as 87%-92% and cumulative methane yield close to theoretical value （0.35 L CH4/g CODdeg）. Methane production and COD depletion presented biphasic characteristics associated with the successive utilization of two major intermediates, acetate and propionate, The biphasic degradation of fresh leachate was resulted from the different hydrolysis rates of diverse substrates and the changes in microorganism community structure. After 50 d, the effluents were dominated by high-MW organic compounds （MW 〉 10 kDa） at each inoculum ratio, which might be refractory compounds released from cell lyses.