title: Anaerobic co-digestion of food waste and landfill leachate in single-phase batch reactors.
abstract: In order to investigate the effect of raw leachate on anaerobic digestion of food waste, co-digestions of food waste with raw leachate were carried out. A series of single-phase batch mesophilic (35±1°C) anaerobic digestions were performed at a food waste concentration of 41.8 g VS/L. The results showed that inhibition of biogas production by volatile fatty acids (VFA) occurred without raw leachate addition. A certain amount of raw leachate in the reactors effectively relieved acidic inhibition caused by VFA accumulation, and the system maintained stable with methane yield of 369-466 mL/g VS. Total ammonia nitrogen introduced into the digestion systems with initial 2000-3000 mgNH4-N/L not only replenished nitrogen for bacterial growth, but also formed a buffer system with VFA to maintain a delicate biochemical balance between the acidogenic and methanogenic microorganisms. UV spectroscopy and fluorescence excitation-emission matrix spectroscopy data showed that food waste was completely degraded. We concluded that using raw leachate for supplement water addition and pH modifier on anaerobic digestion of food waste was effective. An appropriate fraction of leachate could stimulate methanogenic activity and enhance biogas production.
authors: School of Environmental Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China.
authors: Xiaofeng
authors: X
authors: Liao
authors: School of Environmental Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China.
authors: Shuangyan
authors: S
authors: Zhu
authors: School of Environmental Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China.
authors: Delai
authors: D
authors: Zhong
authors: School of Environmental Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China. Electronic address: jpzhuhust@163.com.
authors: Jingping
authors: J
authors: Zhu
authors: School of Environmental Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China. Electronic address: liaoli2003@126.com.
authors: Li
authors: L
authors: Liao
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D005511:Food Handling; D062611:Solid Waste / Q000032:analysis*; D064091:Waste Disposal Facilities; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D062611:Solid Waste; D014874:Water Pollutants, Chemical
keywords: Ammonia nitrogen; Anaerobic digestion; Fluorescence excitation–emission matrix spectroscopy; Food waste; Landfill leachate; UV–vis spectroscopy