title: Effect of thermal-alkaline pretreatment on the anaerobic digestion of streptomycin bacterial residues for methane production.
abstract: The anaerobic digestion of streptomycin bacterial residues, solutions with hazardous waste treatments and bioenergy recovery, was tested in laboratory-scale digesters at 35°C at various organic loading rates (OLRs). The methane production and biomass digestion were efficient at OLRs below 2.33 gVS L(-1) d(-1) but were deteriorated as OLR increased because of the increased total ammonia nitrogen (TAN) concentration from cell protein decay. The thermal-alkaline pretreatment with 0.10 NaOH/TS at 70°C for 2 h significantly improved the digestion performance. With the thermal-alkaline pretreatment, the volumetric reactor productivity and specific methane yield of the pretreated streptomycin bacterial residue increased by 22.08-27.08% compared with those of the unpretreated streptomycin bacterial residue at an OLR of 2.33 gVS L(-1) d(-1). The volatile solid removal was 64.09%, with less accumulation of TAN and total volatile fatty acid.
authors.affiliation: School of Environmental Science and Engineering, Hebei University of Science and Technology, Yuhua East Road, Shijiazhuang 050018, China.
authors.forename: Weizhang
authors.initials: W
authors.lastname: Zhong
authors.forename: Zaixing
authors.initials: Z
authors.lastname: Li
authors.forename: Jingliang
authors.initials: J
authors.lastname: Yang
authors.forename: Chun
authors.initials: C
authors.lastname: Liu
authors.forename: Baokuo
authors.initials: B
authors.lastname: Tian
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Wang
authors.forename: Ping
authors.initials: P
authors.lastname: Chen
mesh_terms: D000641:Ammonia / Q000032:analysis; D000693:Anaerobiosis / Q000187:drug effects; D001419:Bacteria / Q000187:drug effects / Q000378:metabolism*; D001673:Biodegradation, Environmental / Q000187:drug effects; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D001709:Biotechnology / Q000379:methods*; D008697:Methane / Q000096:biosynthesis*; D009584:Nitrogen / Q000032:analysis; D012972:Sodium Hydroxide / Q000494:pharmacology*; D013307:Streptomycin / Q000096:biosynthesis*; D013696:Temperature; D014866:Waste Products / Q000032:analysis*
chemical_list: D014866:Waste Products; D012972:Sodium Hydroxide; D000641:Ammonia; D009584:Nitrogen; D008697:Methane; D013307:Streptomycin
keywords: Anaerobic digestion; Methane; Streptomycin bacterial residue; Thermal–alkaline pretreatment