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首页> 外文期刊>Bioprocess and Biosystems Engineering >Effect of temperature and hydraulic retention time on volatile fatty acid production based on bacterial community structure in anaerobic acidogenesis using swine wastewater
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Effect of temperature and hydraulic retention time on volatile fatty acid production based on bacterial community structure in anaerobic acidogenesis using swine wastewater

机译：温度和水力停留时间对猪废水厌氧产酸过程中细菌群落结构对挥发性脂肪酸产生的影响

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摘要

To investigate the effect of hydraulic retention time (HRT) and temperature (T) on bacterial community structure and volatile fatty acids (VFAs) production of an acidogenic process, and VFA production and changes in the bacterial community in three identical automated anaerobic continuously-stirred tank reactors were analyzed using response surface analysis (RSA) and nonmetric multidimensional scaling (NMDS). For RSA, 11 trials were conducted to find the combination of T and HRT under which VFA production was greatest; VFA production was affected more by HRT than by T. To identify the bacterial community structure in each trial, DNA from each experimental point of the RSA was analyzed using denaturating gradient gel electrophoresis (DGGE), and eight bacteria species were detected. NMDS was conducted on band intensities obtained using DGGE, and bacterial community structure was affected more by T than by HRT. Taken together, these results suggest that VFA production during acidogenesis was more dependent on the physicochemical properties of acidogens, such as their specific growth rate or contact time with of substrates, than on changes in the microbial community.
机译：研究水力停留时间（HRT）和温度（T）对产酸过程中细菌群落结构和挥发性脂肪酸（VFA）产生的影响，以及在三个相同的自动厌氧连续搅拌中VFA产生和细菌群落变化的影响使用响应表面分析（RSA）和非度量多维标度（NMDS）分析了槽式反应堆。对于RSA，进行了11个试验来发现T和HRT的组合，其中VFA的产生最大。 VRT的产生受HRT的影响比受T的影响更大。为鉴定每个试验中的细菌群落结构，使用变性梯度凝胶电泳（DGGE）分析了RSA每个实验点的DNA，并检测了8种细菌。 NMDS是对使用DGGE获得的谱带强度进行的，细菌群落结构受T的影响大于受HRT的影响。综上所述，这些结果表明，酸产生过程中VFA的产生更多地取决于酸原的物理化学特性，例如其比生长速率或与底物的接触时间，而不是微生物群落的变化。

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