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Water SA

On-line version ISSN 1816-7950
Print version ISSN 0378-4738

Water SA vol.34 n.1 Pretoria Jan. 2008


A laboratory simulation of in situ leachate treatment in semi-aerobic bioreactor landfill



Shou-liang HuoI, II; Bei-dou XiII; Hai-chan YuIII; Shi-lei FanIV; Su JingII; Hong-liang LiuII

IEnvironment School, Beijing Normal University, Beijing 100875, China
IIChinese Research Academy of Environmental Sciences, Beijing 100012, China
IIICollege of Life Sciences, Beijing Normal University, Beijing 100875, China
IVThe College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China





In this study, two laboratory-scale simulated landfill bioreactors were established, of which Reactor A was operated only with leachate recirculation and served as the control, and Reactor B was operated as semi-aerobic bioreactor landfill with leachate recirculation. In situ leachate treatment and accelerating organic decomposition in semi-aerobic bioreactor landfill was investigated. The results indicated that the introduction of air into the landfill was favourable for optimising the micro-organism growth environment and accelerating the degradation of organic matter. It can be seen clearly from the results that NH4+-N can be removed in situ in the semi-aerobic bioreactor landfill with leachate recirculation. Moreover, semi-aerobic bioreactor landfill showed lower emissions for leachate than those in leachate from anaerobic landfill, with low concentrations of COD, VFA, NH4+-N and TKN, and which saved the disposing process of the discharged leachate. The three-dimensional excitation-emission matrix fluorescence spectroscopy (EEMs) of dissolved organic matter (DOM) in Reactor B changed greatly, and fluorescence peak changed from protein-like fluorescence at Day 60 to humic-like fluorescence at Day 95 and 250, while in Reactor A, fluorescence peak of DOM was always protein-like fluorescence. The comparison of the EEMs indicated that the semi-aerobic landfill accelerated the organic decomposition.

Keywords: semi-aerobic landfill, bioreactor landfill, three-dimensional excitation-emission matrix fluorescence spectroscopy (EEMs), in situ leachate treatment


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Received 22 June 2007;
Accepted in revised form 17 August 2007.