title: Alkaline thermal pretreatment at mild temperatures for biogas production from anaerobic digestion of antibiotic mycelial residue.
abstract: This paper aims at lowering the temperature for thermal pretreatment (TPT) of antibiotic mycelial residue (AMR) by alkali addition but without significantly worsening subsequent anaerobic digestion (AD) for biogas. Batch TPT and AD experiments were conducted in a bench-scale autoclave and several bench-scale anaerobic digesters, respectively. The results showed that the methane yield (<200 ml·(g VS)(-1)) was visibly lower with lowering pretreatment temperature, compared to that (290 ml·(g VS)(-1)) for TPT at the optimal temperature of 120°C, while it rebounded to 231 ml·(g VS)(-1) when proper amounts of alkali were employed (to adjust the pH of the AMR to 12) for TPT at 80°C. Further analysis indicated that low-temperature alkaline TPT was significantly less energy-consumption compared to only TPT, at cost of small amounts of alkali. It was more convenient and economical to implement AD of AMR in combination with alkaline TPT at mild temperatures for biogas.
authors.affiliation: State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
authors.forename: Chunxing
authors.initials: C
authors.lastname: Li
authors.affiliation: State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: gyzhang@ipe.ac.cn.
authors.forename: Guangyi
authors.initials: G
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Zhikai
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Environment, Guangxi University, Nanning 530004, China.
authors.forename: Dachao
authors.initials: D
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Guangwen
authors.initials: G
authors.lastname: Xu
mesh_terms: D000468:Alkalies / Q000737:chemistry; D000693:Anaerobiosis; D000900:Anti-Bacterial Agents / Q000737:chemistry*; D056804:Biofuels; D019149:Bioreactors; D001709:Biotechnology / Q000295:instrumentation / Q000379:methods*; D002511:Cephalosporins / Q000737:chemistry; D008697:Methane / Q000096:biosynthesis*; D025282:Mycelium; D013696:Temperature
chemical_list: D000468:Alkalies; D000900:Anti-Bacterial Agents; D056804:Biofuels; D002511:Cephalosporins; C025163:cephalosporin C; D008697:Methane
keywords: Alkaline thermal pretreatment; Anaerobic digestion; Antibiotic mycelial residue; Biogas; Methane