Lopez Zavala Miguel Angel, Funamizu Naoyuki, Takakuwa Tetsuo
Department of Environmental Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060-8628, Japan.
Water Res. 2004 May;38(9):2405-15. doi: 10.1016/j.watres.2004.02.026.
Temperature is one of the most important factors affecting microbial growth and biological reactions. In this study, the effect of temperature on aerobic biodegradation of feces is described through the comparison and analysis of experimental oxygen utilization rates (OUR) profiles obtained from batch tests conducted at several temperatures covering mainly mesophilic and thermophilic ranges. Additionally, the temperature effect was incorporated into the bio-kinetic model introduced by Lopez Zavala et al. (Water Res 38(5) (2004) 1327) and simulation of experimental OUR profiles was conducted. Results show that mesophilic and thermophilic microorganisms behaved differently to temperature; additionally, results suggest that the optimum temperature from the viewpoint of feces biodegradability is within the thermophilic range, nearly 60 degrees C. The enzymatic activity of microorganisms at 70 degrees C was remarkably diminished. For better predictions in the mesophilic range, two fractions of slowly biodegradable organic matter were identified, easily hydrolyzable organic matter (X(Se)) and slowly hydrolyzable organic matter (X(Ss)).
温度是影响微生物生长和生物反应的最重要因素之一。在本研究中，通过比较和分析在主要涵盖中温及高温范围的几个温度下进行的批次试验所获得的实验氧利用率（OUR）曲线，描述了温度对粪便好氧生物降解的影响。此外，将温度效应纳入Lopez Zavala等人（《水研究》38(5) (2004) 1327）提出的生物动力学模型，并对实验OUR曲线进行了模拟。结果表明，中温微生物和高温微生物对温度的反应不同；此外，结果表明，从粪便生物降解性的角度来看，最佳温度在高温范围内，接近60摄氏度。70摄氏度时微生物的酶活性显著降低。为了在中温范围内进行更好的预测，确定了两部分难生物降解的有机物质，即易水解有机物质（X(Se)）和难水解有机物质（X(Ss)）。
