Journal
WASTE MANAGEMENT
Volume 33, Issue 11, Pages 2277-2286Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2013.07.021
Keywords
Landfill leachate; Concentrated leachate; Dissolved organic matter; Bacterial community
Categories
Funding
- National Natural Science Foundation of China [41001148, 51178411, 51108419]
- Zhejiang Province Natural Science Foundation for Distinguished Young Scholars [LR13E080002]
- Fundamental Research Funds for the Central Universities [2012QNA6006]
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Concentrated leachate from membrane treatment processes is a potential pollution source for the surroundings. In this study, with comparison of the landfill leachate, chemical and microbial characteristics of concentrated leachate including biodegradability, amount of nitrogenous compounds and heavy metals, dissolved organic matter composition, and microbial community were investigated in three landfill leachate treatment plants. The results showed that hydrophilic (HyI) fraction was the major dissolved organic carbon in the landfill leachates, accounting for 54.6-60.7%, while humic substances including humic acid (HA) and fulvic acid (FA) were relatively higher in the concentrated leachates, ranging from 61.7% to 69.2%. Conjugated nitrogen existed mainly in FA and HyI in the concentrated leachates. The analysis of excitation emission matrix fluorescence spectroscopy, specific ultraviolet absorbance at 254 nm (SUVA(254)) and GC/MS showed that aromatic compounds, long-chain hydrocarbons and halohydrocarbons were abundant in the concentrated leachates. During landfill leachate treatment processes, Cl-, SO42- and heavy metals were commonly accumulated in the concentrated leachates. NO3--N and/or NH4+-N were the major nitrogenous compounds in the concentrated leachates. All the leachates from three landfill sites contained toluene in the range of 44.5-728.4 mu g L-1. Ethylbenzene, chlorobenzene, and the phthalic acid esters including dibutyl phthalate, dimethyl phthalate and di-n-octyl phthalate were also detected in the concentrated leachates. Higher microbial diversity was observed in the concentrated leachate in comparison with landfill leachate. (C) 2013 Elsevier Ltd. All rights reserved.
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