Effect of Leachate Spraying Intensity on High-Solid Anaerobic Digestion of Corn Stover and Organic Fraction of Municipal Solid Waste

• Published in: Waste and biomass valorization 2020-07, Vol.11 (7), p.3293-3301
• Main Authors: Qian, Mingyu, Zhou, Ye, Zhang, Yixin, Wang, Zhenxin, Li, Ruihua, Jiang, Hao, Zhou, Hongjun, Li, Yeqing
• Format: Article
• Language: English
• Subjects: Anaerobic digestion; Carbon dioxide; Corn; Engineering; Environment; Environmental Engineering/Biotechnology; Fatty acids; Industrial Pollution Prevention; Inoculum; Inorganic carbon; Leachates; Liquid sludge; Methane; Methanogenesis; Municipal solid waste; Municipal waste management; Original Paper; Parameters; Refuse as fuel; Renewable and Green Energy; Sludge; Sludge digestion; Solid waste management; Spraying; Stover; Waste Management/Waste Technology
• ISSN: 1877-2641; 1877-265X
• DOI: 10.1007/s12649-019-00661-6

The effects of leachate spraying intensity (LSI, the ratio of leachate spraying rate and spraying area) on high-solid anaerobic digestion (HS-AD) of corn stover (CS) and organic fraction of municipal solid waste (OFMSW) were investigated for the first time. Three leach-bed reactors (LBR) with working volume of 48 L were used in this study. Gaseous parameters including CH 4 , H 2 and CO 2 concentration, and liquid parameters including pH, volatile fatty acid (VFA) and total inorganic carbon (TIC), were measured. Results found that LSI could significant influence the methane yield from HS-AD of CS and OFMSW. Higher LSI of 88 mL/min dm 2 could enhance the degradation rate of feedstocks, with highest VFA concentration of 21273 mg/L using liquid sludge as inoculum. Consequently, the methanogenesis was inhibited. Incubation of solid digestate (50% of solid digestate + 50 of liquid sludge) can be operated stably at higher LSI of 88 mL/min dm 2 , where highest methane yield of 184.6 mL/g VS was obtained. The finding of this study could provide useful information for the efficient operation of HS-AD.