The Evolution of Microbial Community during Acclimation for High Sodium Food Waste Anaerobic digestion
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ORIGINAL PAPER
The Evolution of Microbial Community during Acclimation for High Sodium Food Waste Anaerobic digestion Yangqing Hu1 · Fei Wang1 · Yong Chi1 Received: 17 June 2019 / Accepted: 16 October 2019 © Springer Nature B.V. 2019
Abstract Anaerobic digestion is a promising method for treating the rapidly increasing food wastes. However, the high level of sodium salt in food waste significantly inhibited the anaerobic digestion process. In this study, acclimation was conducted to adapt to the high sodium food waste. The evolution of microbial community during acclimation process was characterized by highthroughput sequencing based on the 16S rRNA gene. The results revealed that the predominant phyla were Bacteroidetes, Firmicutes, Thermotogae, Chloroflexi, Proteobacteria and Synergistetes. The increase of functional genera Kosmtoga, Levilinea and Longilinea during the process potentially promoted the biodegradation of organics. As for the archaea community, the mixotrophic methanogens Methanosaricina was almost replaced by hydrogenotrophic methanogens Methanobacterium and Methanocorpusculum. The variations of pH and volatile fatty acid during acclimation provided additional information on the adaptation of microorganisms to the high sodium environment. The biogas production of food waste inoculated with acclimated sludge was increased by 63.6% compared with the raw sludge. Graphic Abstract The evolutions of bacterial and archaea communities during acclimation at the phylum level
Keywords Food waste · Anaerobic digestion · High-throughput sequencing · Microbial community · Sodium salt · Acclimation
Statement of Novelty * Fei Wang [email protected] 1
Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, China
Acclimation was conducted to adapt to the high sodium food waste, and the evolution of microbial community during acclimation process was characterized by HTS based on the 16S rRNA gene.
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Introduction With the acceleration of urbanization, the production of municipal solid waste (MSW) increased dramatically. It’s reported that the annual generation of MSW has attained about 130 million tons per year in China [1]. Due to the great pressure of energy shortage and environmental pollution, promoting the reduction, reuse and recycling of MSW has attracted increasing attention [2]. Meanwhile, food waste constitutes the largest proportion of MSW in China [3]. Attributed to its high volatile organic compounds and moisture content, food waste is a major source of odor, decay and leachate in transportation and collection [4]. Considering the adverse effects of landfilling, incineration and composting for food waste management [5-7], anaerobic digestion has been proposed as a promising method for both energy and material recovery [8]. During the anaerobic digestion process, biogas can be produced through microorganisms conversion and the byproduct of nutritious residues can also be further used for land application [9]. Anaerobic dig
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