title: Effects of mixture ratio on anaerobic co-digestion with fruit and vegetable waste and food waste of China.
abstract: The biochemical methane potentials for typical fruit and vegetable waste (FVW) and food waste (FW) from a northern China city were investigated, which were 0.30, 0.56 m3 CH4/kgVS (volatile solids) with biodegradabilities of 59.3% and 83.6%, respectively. Individual anaerobic digestion testes of FVW and FW we re conducted at the organic loading rate (OLR) of 3 k g VS/(m3.day) using a lab-scale continuous stirred-tank reactor at 350C. FVW could b e digested stably with the biogas production rate of 2.17 m3/(m3 .day)and methane production yield of 0.42 m3 CH4/kg VS. However, anaerobic digestion process for FW was failed due to acids accumulation. The effects of FVW: FW ratio on co-digestion stability and performance were further investigated at the same OLR. At FVW and FW mixing ratios of 2:1 and 1:1, the performance and operation of the digester were maintained stable, with no accumulation of volatile fatty acids (VFA) and ammonia. Changing the feed to a higher FW content in a ratio of FVW to FW 1:2, resulted in an increase inVFAs concentration to 1100-1200 mg/L, and the methanogenesis was slightly inhibited. At the optimum mixture ratio 1:1 for co-digestion of FVW with FW, the methane production yield was 0.49 m3 CH4/kg VS, and the volatile solids and soluble chemical oxygen demand (sCOD) removal efficiencies were 74.9% and 96.1%, respectively.
authors: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
authors: Jia
authors: J
authors: Lin
authors: Jiane
authors: J
authors: Zuo
authors: Lili
authors: L
authors: Gan
authors: Peng
authors: P
authors: Li
authors: Fenglin
authors: F
authors: Liu
authors: Kaijun
authors: K
authors: Wang
authors: Lei
authors: L
authors: Chen
authors: Hainan
authors: H
authors: Gan
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D002681:China; D005502:Food; D005638:Fruit; D008697:Methane; D012722:Sewage / Q000382:microbiology*; D014675:Vegetables
chemical_list: D012722:Sewage; D008697:Methane