title: Anaerobic digestion of food waste stabilized by lime mud from papermaking process.
abstract: The effects of lime mud from papermaking process (LMP) addition as buffer agent and inorganic nutrient on the anaerobic digestion stability of food waste (FW) were investigated under mesophilic conditions with the aim of avoiding volatile fatty acids accumulation, and inorganic elements deficiency. When LMP concentration ranged from 6.0 to 10g/L, the FW anaerobic digestion could maintain efficient and stable state. These advantages are attributed to the existence of Ca, Na, Mg, K, Fe, and alkaline substances that favor the methanogenic process. The highest CH4 yield of 272.8mL/g-VS was obtained at LMP and VS concentrations of 10.0 and 19.8g/L, respectively, with the corresponding lag-phase time of 3.84d and final pH of 8.4. The methanogens from residue digestates mainly consisted of Methanobrevibacter, coccus-type and sarcina-type methanogens with LMP addition compared to Methanobacteria in control. However, higher concentration of LMP inhibited methanogenic activities and methane production.
authors.affiliation: School of Environmental Science and Engineering, Qilu University of Technology, Jinan 250353, China. Electronic address: lyzhangjishi@163.com.
authors.forename: Jishi
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Food and Bioengineering, Qilu University of Technology, Jinan 250353, China.
authors.forename: Qinqing
authors.initials: Q
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Qilu University of Technology, Jinan 250353, China.
authors.forename: Pengwei
authors.initials: P
authors.lastname: Zheng
authors.affiliation: Rizhao Center for Solid Waste Disposal, Rizhao 276800, China.
authors.forename: Yusong
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000693:Anaerobiosis; D017610:Calcium Compounds / Q000378:metabolism; D002681:China; D004063:Digestion / Q000502:physiology*; D005502:Food; D008697:Methane / Q000096:biosynthesis*; D017013:Methanobacteriaceae / Q000378:metabolism / Q000502:physiology*; D010087:Oxides / Q000378:metabolism; D010209:Paper; D012037:Refuse Disposal / Q000379:methods*; D014866:Waste Products
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D014866:Waste Products; C016538:lime; D008697:Methane
keywords: Anaerobic digestion; Food waste; Lime mud from papermaking process; Process stability