title: Mass and Energy Balances of Dry Thermophilic Anaerobic Digestion Treating Swine Manure Mixed with Rice Straw.
abstract: To evaluate the feasibility of swine manure treatment by a proposed Dry Thermophilic Anaerobic Digestion (DT-AD) system, we evaluated the methane yield of swine manure treated using a DT-AD method with rice straw under different C/N ratios and solid retention time (SRT) and calculated the mass and energy balances when the DT-AD system is used for swine manure treatment from a model farm with 1000 pigs and the digested residue is used for forage rice production. A traditional swine manure treatment Oxidation Ditch system was used as the study control. The results suggest that methane yield using the proposed DT-AD system increased with a higher C/N ratio and shorter SRT. Correspondently, for the DT-AD system running with SRT of 80 days, the net energy yields for all treatments were negative, due to low biogas production and high heat loss of digestion tank. However, the biogas yield increased when the SRT was shortened to 40 days, and the generated energy was greater than consumed energy when C/N ratio was 20 : 1 and 30 : 1. The results suggest that with the correct optimization of C/N ratio and SRT, the proposed DT-AD system, followed by using digestate for forage rice production, can attain energy self-sufficiency.
authors.affiliation: Eco-Environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Zhou
authors.affiliation: Eco-Environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.
authors.forename: Jining
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Eco-Environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China ; Shanghai Co-Elite Agricultural Sci-Tech (Group) Co., Ltd., Shanghai 201403, China.
authors.forename: Guoyan
authors.initials: G
authors.lastname: Zou
authors.affiliation: Institute of Engineering, Tokyo University of Agriculture & Technology, Tokyo 184-8588, Japan.
authors.forename: Shohei
authors.initials: S
authors.lastname: Riya
authors.affiliation: Institute of Engineering, Tokyo University of Agriculture & Technology, Tokyo 184-8588, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Hosomi