title: [Continuous dry fermentation of pig manure using up plug-flow type anaerobic reactor].
abstract: To solve the problems of ammonia inhibition and discharging difficulty in continuous dry fermentation of pig manure, under the experimental conditions of temperature of (25 +/- 2) degrees C and organic loading rate (TS) of 4.44 g x (L x d) (-1), a lab-scale up plug-flow type anaerobic reactor (UPAR) was setup to investigate biogas production, ammonia inhibition, effluent liquidity, and the feasibility of continuous dry fermentation of pig manure using up plug-flow type anaerobic reactor. The experiment was operated for 160 days using the pig manure with four different TS mass fractions (20%, 25%, 30%, 35%) as feeding. Results showed that the feeding TS mass fraction exerted a significant influence on the dry fermentation of pig manure; the stable volumetric biogas production rates of four different feeding TS mass fractions were 2.40, 1.73, 0.89, and 0.62 L x (L x d)(-1), respectively; the biogas producing efficiencies of the reactors with feeding TS mass fractions of 20%, 25% and 30% were obviously superior to that with feeding TS of 35%. With feeding TS mass fraction increased from 20% to 35%, obvious inhibition to biogas producing occurred when concentration of ammonia nitrogen reached more than 2 300 mg x L(-1). When the feeding TS mass fraction was 35%, the concentration of ammonia nitrogen could accumulate to 3 800 mg x L(-1) but biogas production rate decreased 74.1% of that with feeding TS of 20%. Additionally, while the feeding TS mass fraction was 35%, the effluent TS mass fraction achieved 17.1%, and the velocity of effluent was less than 0.002 m x s(-1) the effluent of UPAR could not be smoothly discharged.
authors.affiliation: College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China. chen198039@126.com
authors.forename: Chuang
authors.initials: C
authors.lastname: Chen
authors.forename: Liang-Wei
authors.initials: LW
authors.lastname: Deng
authors.forename: Xin
authors.initials: X
authors.lastname: Xin
authors.forename: Dan
authors.initials: D
authors.lastname: Zheng
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Chui-Xue
authors.initials: CX
authors.lastname: Kong
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors; D005285:Fermentation; D008372:Manure / Q000032:analysis*; D012037:Refuse Disposal / Q000379:methods; D034421:Sus scrofa / Q000254:growth & development
chemical_list: D056804:Biofuels; D008372:Manure