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摘要
In this paper, the changes of gas-liquid composition and microbial community in the process of washing and purifying restaurant cooking fume VOCs after acclimation of activated sludge for 25 days were studied. The results showed that the MLSS of activated sludge after acclimation was stable at 3.10 g·L?1, MLVSS was stable at 1.60~1.90 g·L?1, SV and SVI were stable at 35% and 120 mL·g?1, respectively. Under these conditions, the washing efficiency of lampblack was stable at 85%, the washing efficiency of enaldehydes, alcohols, alkanes and esters in lampblack reached more than 95%, and only the washing efficiency of some straight-chain aldehydes was low.The organic matter in the activated sludge before domestication was mainly composed of chlorinated substances and long-chain alkanes., while esters became the main components after domestication. In addition, 18 kinds of organic compounds were detected during the liquid phase lampblack attenuation test of activated sludge, 14 organic compounds were completely degraded by microorganisms within the degradation period of 1 to 3 days; pentadecane, 8-heptadecanene, and 17-35carbene were completely degraded within 4 to 5 days, and only trichloroethylene still remained at a high content. High-throughput sequencing analysis indicated that the main metabolizing microorganisms in the degradation process of VOCs in liquid oil smoke were Planctomicrobium, Spartobacteria, Microbacterium, Steroidobacter, Rubinisphaera, Luteolibacter, Phycisphaera and Nectriaceae, Trichoderma, Saccharomycetes, Cryptococcus, Trichosporonaceae, Archaeorhizomycetaceae, Yarrowia. The species and abundance of microorganisms were affected by VOCs components of liquid oil fume and varied with the degradation reaction. This study can provide reference for the application of biological washing method to treat cooking fume. ? 2022, Science Press. All right reserved.
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