Anaerobic digestion of spectinomycin mycelial residues pretreated by thermal hydrolysis: removal of spectinomycin and en
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RESEARCH ARTICLE
Anaerobic digestion of spectinomycin mycelial residues pretreated by thermal hydrolysis: removal of spectinomycin and enhancement of biogas production Siqi Song 1 & Mingye Jiang 1 & Jie Yao 1 & Huiling Liu 2 & Xiaohu Dai 2 Received: 7 December 2019 / Accepted: 1 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Anaerobic digestion (AD) is an effective technology to dispose antibiotic mycelial residues, but biogas production is influenced by hydrolysis rates and antibiotic residue. Herein, the effects of thermal hydrolysis pretreatment for AD of spectinomycin mycelial residues (SMRs) were investigated. The results showed that the removal ratio of spectinomycin was increased while the temperature of pretreatment was escalating. Meanwhile, thermal hydrolysis facilitated the dissolution of organic matters. However, non-biodegradable substances measured by fluorescence excitation–emission matrix accumulated and thus had an adverse influence on biogas production. Based on batch assays, the optimal pretreatment temperature for SMRs was 120 °C. The removal of spectinomycin was benefit for biogas production (increasing by 7.6%), and the overall biogas production increased by 27.6% compared with 289.90 mL gVS−1 of untreated SMRs. The microbial community analysis revealed that spectinomycin (265 mg L−1) might influence bacteria in the early stage of AD (first 5 days), while redundancy analysis showed that spectinomycin had a non-significant influence on community succession over the 32 days of fermentation. Keywords Antibiotic mycelial residues . Antibiotic . Excitation–emission matrix . Fluorescence regional integration . Redundancy analysis . Microbial community
Introduction There are 1.3 million ton antibiotic bioferment residues (also known as antibiotic mycelial residues (AMRs)) produced in China annually which are classified as hazardous waste (Zhong et al. 2014). AMRs, containing high content of organic Responsible editor: Ta Yeong Wu Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-09985-6) contains supplementary material, which is available to authorized users. * Jie Yao [email protected] * Huiling Liu [email protected] 1
State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
2
School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
ingredients, are a kind of recoverable resources. However, AMRs also inevitably contain residual antibiotic due to the incomplete extraction of bulk drug. If the residual antibiotic in AMRs entered into environment directly, it would develop antimicrobial resistance of microorganisms and then threaten public health (Le Page et al. 2017). For this reason, AMRs are strictly prohibited from food additives and fertilizer purposes in China. Nowadays, incineration has already been considered as the safest way to dispose AMRs, but high energy consump
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