期刊
ENVIRONMENTAL TECHNOLOGY
卷 35, 期 7, 页码 799-807出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2013.852625
关键词
leachate recirculation; bioreactor landfill; aged refuse bioreactor; blockage; leachate treatment
资金
- National Natural Science Foundation of China [40872151, 51368012]
- Natural Science Foundation of Guangxi Province [2010GXNSFA013015]
- Research Funds of Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology [0901Z001]
- Doctoral Scientific Research Starting Foundation of Guilin University of Technology [2009035]
- Program of National Natural Science Foundation of China [51178229]
In a sequencing batch bioreactor landfill system which combined a fresh and an aged refuse bioreactor, blockage occurred frequently in the aged refuse bioreactor during the treatment of leachate from the fresh refuse bioreactor. To overcome this problem, another aged refuse bioreactor was added, when blockage occurred, the two aged refuse bioreactor operated alternatively. A fresh refuse bioreactor F combined with two alternating aged refuse bioreactors A1 and A2 was called alternate recirculation process (ARP) in this study. The bioreactor system was operated in three stages, and the three bioreactors were exposed to air to facilitate surface re-aeration. The effect of the ARP on the accelerated degradation of fresh refuse was compared before and after blockage occurs in A1. The results indicated that ARP can improve the leachate production rate. The average daily net production rates of leachate in Stages 2 and 3 were approximately 2.1 and 1.6 mL (kg refuse d)(-1), respectively, which exceeded that of Stage 1 (1.3 mL (kg refuse d)(-1)). The chemical oxygen demand and NH3-N concentrations of the leachate from Stage 1 are 1000 and 25 mg L-1 after 2.1 and 2.7 y, respectively. For Stages 2 and 3, these concentrations reach approximately after 0.877 and 1.3 y. Faster refuse settlement was observed in Stages 2 and 3, with an average daily settlement of approximate to 0.11%, as compared with Stage 1 (approximate to 0.099%). ARP can accelerate the biodegradation of the fresh refuse and overcome the problem of the blockage in the aged refuse reactor.
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