Effect of temperature on performance and microbial diversity in hyperthermophilic digester system fed with kitchen garbage
Effect of temperature on performance and microbial diversity in hyperthermophilic digester system fed with kitchen garbage
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DOI：
10.1016/j.biortech.2008.01.038
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发表时间：
2008-10-01
影响因子：
11.4
通讯作者：
Tsuno, Hiroshi
中科院分区：
文献类型：
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作者：
Lee, Myungyeol;Hidaka, Taira;Tsuno, Hiroshi
本研究的目的是评价由超高温反应器和超高温或高温反应器串联组成的高效超高温消化系统的性能和微生物培养。实验室规模的反应器连续运行，并注入人工厨房垃圾。首先考察了温度对酸化反应的影响。结果表明，在70 ℃时，COD的溶解率达到43.1%，而在80 ℃时，COD的溶解率约为21%。在80 ℃时，蛋白质的平均溶解率达到31%。酸化后的甲烷转化效率在55 ℃时平均为85%左右，但随着温度的升高而降低，超过73 ℃时不产生甲烷气体。其次观察到甲烷发酵罐中微生物生长的温度上限，并且显示乙酸盐氧化剂为73 ℃，丙酸盐氧化剂为65 ℃，异丁酸盐氧化剂为70 ℃，乳酸盐氧化剂为80 ℃，蛋白质降解细菌为65 ℃。此外，与产甲烷菌有关的微生物在65 ℃以下占主导地位，而与产酸菌有关的微生物在73 ℃以上占主导地位。这些结果表明，超高温工艺对处理含高浓度蛋白质的废水或废物有相当大的好处。(C)2008爱思唯尔有限公司保留所有权利。
The objective of this study was to evaluate the performances and microbial diversities for development of the effective hyperthermophilic digester system that consists of hyperthermophilic reactor and hyperthermophilic or thermophilic reactor in series. Lab-scale reactors were operated continuously fed with artificial kitchen garbage. The effect of temperature on the acidification step was firstly investigated. Results indicated that 43.1 % of COD solubilization was achieved at 70 degrees C, while it was about 2 1 % at 80 degrees C. The average protein solubilization reached to 31% at 80 degrees C. Methane conversion efficiency following the acidification was around 85% in average at 55 degrees C, but decreased with increasing temperature and methane gas was not produced over 73 degrees C. The upper temperature limits for growth of microbes were secondly observed and shown to be 73 degrees C for acetate oxidizers, 65 degrees C for propionate oxidizers, 70 degrees C for iso-butyrate oxidizers, 80 degrees C for lactate oxidizers and 65 degrees C for protein degrading bacteria in the methane fermenter. As well as, microbes affiliated with methanogens dominated the population below the 65 degrees C, while those affiliated with acidogens were predominant over the 73 degrees C. These results indicated that the hyperthermophilic processes have considerable benefits to treat wastewater or waste containing high concentration of protein. (C) 2008 Elsevier Ltd. All rights reserved.