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Jianhui Wang,Guolong Xie,Xin Qi,Ruifeng Ming,Bin Zhang,Hai Lu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.6
Four carbon sources (including trehalose, glucose, acetic acid, and yeast extract) were used as the co-metabolicmatrix of pentachlorophenol (PCP). The effect of the carbon sources on the process of acclimatization and degradationof PCP was investigated. The acclimatization rate of carbon sources with different substrates, the activities ofmicrobial enzymes in the co-metabolism process, and the control of co-metabolism reaction conditions were evaluated. The kinetic model of co-metabolic degradation of PCP in micro aerated sequencing batch reactor (SBR) wasestablished based on the Monod equation. The model was applied to fit the operating conditions of the micro aeratedSBR process in this study. The experimental results showed that the type and concentration of metabolic matrix greatlyinfluenced the degradation rate of PCP, and its trehalose, glucose, and acetic acid enhanced the degradation of PCP. Inparticular, the strengthening effect of trehalose was pronounced. When trehalose was used as a co-metabolic carbonsource, the time required for PCP degradation to a predetermined degree was shortened to one-fifth of the original,PCP removal rate exceeded 95%. At the same time, yeast extract inhibited the biodegradation of PCP when it was usedas an additional matrix carbon source. After the co-metabolism carbon source was added to the system, the proliferationrate of the microorganism was increased, and the key enzymes of PCP degradation were induced in the system. When the co-metabolic carbon source concentration was high, it accelerated active enzymes’ induction and maintainedhigh activity; 2,3,5-triphenyltetrazolium chloride-electron transport system (TTC-ETS) activity reached about 7.6mgTF/(gTSS·H), and 2-(p-iodophenyl)-3-(p-nitrophenyl)-5-phenyl Tetrazolium chloride-electron transport system(INT-ETS) activity reached 63.5mgINTF/(gTSS·H). When the concentration of co-metabolism carbon source wasextremely high, the co-degradation of toxic organic compounds was inhibited, leading to a decrease in the co-degradationrate. The kinetic model optimized the co-metabolism substrate. The degradation rate of PCP was increased by54.9% by micro-aeration-co-metabolism. The kinetic model was used to fit the microaerobic reaction process of microaeration SBR. The relevant result was in agreement with the experimental result by 97.6%.
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