Biochemical, hydrological and mechanical behaviors of high food waste content MSW landfill: Preliminary findings from a large-scale experiment.
A large-scale bioreactor experiment lasting for 2years was presented in this paper to investigate the biochemical, hydrological and mechanical behaviors of high food waste content (HFWC) MSW. The experimental cell was 5m in length, 5m in width and 7.5m in depth, filled with unprocessed HFWC-MSWs of 91.3 tons. In the experiment, a surcharge loading of 33.4kPa was applied on waste surface, mature leachate refilling and warm leachate recirculation were performed to improve the degradation process. In this paper, the measurements of leachate quantity, leachate level, leachate biochemistry, gas composition, waste temperature, earth pressure and waste settlement were presented, and the following observations were made: (1) 26.8m3leachate collected from the 91.3 tons HFWC-MSW within the first two months, being 96% of the total amount collected in one year. (2) The leachate level was 88% of the waste thickness after waste filling in a close system, and reached to over 100% after a surcharge loading of 33.4kPa. (3) The self-weight effective stress of waste was observed to be close to zero under the condition of high leachate mound. Leachate drawdown led to a gain of self-weight effective stress. (4) A rapid development of waste settlement took place within the first two months, with compression strains of 0.38-0.47, being over 95% of the strain recorded in one year. The compression strain tended to increase linearly with an increase of leachate draining rate during that two months.
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Yuhangtang Road 866#, Hangzhou 310058, China. Electronic address: zhanlt@zju.edu.cn.
Liang-Tong
LT
Zhan
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Yuhangtang Road 866#, Hangzhou 310058, China; School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, 2nd Street 928#, Hangzhou 310018, China. Electronic address: alanxu@zju.edu.cn.
Hui
H
Xu
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Yuhangtang Road 866#, Hangzhou 310058, China. Electronic address: chenyunmin@zju.edu.cn.
Yun-Min
YM
Chen
College of Environmental Science and Engineering, Tongji University, Siping Road 1239#, Shanghai 200092, China. Electronic address: lvfan.rhodea@tongji.edu.cn.
Fan
F
Lü
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Yuhangtang Road 866#, Hangzhou 310058, China. Electronic address: lanjiwu@zju.edu.cn.
Ji-Wu
JW
Lan
College of Environmental Science and Engineering, Tongji University, Siping Road 1239#, Shanghai 200092, China. Electronic address: solidwaste@tongji.edu.cn.
Li-Min
LM
Shao
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Yuhangtang Road 866#, Hangzhou 310058, China. Electronic address: linweian@zju.edu.cn.
Wei-An
WA
Lin
College of Environmental Science and Engineering, Tongji University, Siping Road 1239#, Shanghai 200092, China. Electronic address: xhpjk@mail.tongji.edu.cn.
Pin-Jing
PJ
He
D001673:Biodegradation, Environmental; D019149:Bioreactors; D005502:Food; D062070:Hydrology; D012037:Refuse Disposal / Q000379:methods*; D064091:Waste Disposal Facilities; D014866:Waste Products / Q000032:analysis*
D014866:Waste Products
Biodegradation; Earth pressure; High food waste content; Leachate level; Leachate production; Municipal solid waste (MSW); Settlement