title: Effects of loading rate and temperature on anaerobic co-digestion of food waste and waste activated sludge in a high frequency feeding system, looking in particular at stability and efficiency.
abstract: A continuously stirred tank reactor (CSTR) with a high feeding frequency (HFF) of once every 15min was employed in order to ease the loading shock frequently occurred in digester with a low feeding frequency. The effects of the organic loading rate (OLR) and temperature on the co-digestion of food waste and waste activated sludge was evaluated in a 302-day long-term experiment. Due to the high hydrolysis rate, the maximum CH4yield in a thermophilic reactor was 407mL CH4/gVSadded, a value that was significantly higher than the 350mL CH4/gVSaddedthat occurred in a mesophilic reactor. Although the alkalinity declined when HRT was shorted than 10d, caused by the decrease of conversion ratio from protein to ammonium, the increase of specific methanogenic activity helped HFF system to achieve stable performance at an OLR of 11.2 (HRT 7.5d) and 30.2gVS/L/d (HRT 3d) under mesophilic and thermophilic conditions, respectively.
authors.affiliation: International Science and Technology Cooperation Center for Urban Alternative Water Resources Development; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE; Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi; Key Laboratory of Environmental Engineering, Shaanxi; Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.affiliation: International Science and Technology Cooperation Center for Urban Alternative Water Resources Development; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE; Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi; Key Laboratory of Environmental Engineering, Shaanxi; Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.affiliation: International Science and Technology Cooperation Center for Urban Alternative Water Resources Development; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE; Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi; Key Laboratory of Environmental Engineering, Shaanxi; Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, China.
authors.forename: Gaojun
authors.initials: G
authors.lastname: Wang
authors.affiliation: International Science and Technology Cooperation Center for Urban Alternative Water Resources Development; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE; Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi; Key Laboratory of Environmental Engineering, Shaanxi; Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, China. Electronic address: xcwang@xauat.edu.cn.
authors.forename: Xiaochang
authors.initials: X
authors.lastname: Wang
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D005502:Food; D012037:Refuse Disposal; D012722:Sewage; D013696:Temperature
chemical_list: D012722:Sewage
keywords: Digester stability; Food waste; Organic loading rate; Temperature; Waste activated sludge