Influence of temperature on the hydrolysis, acidogenesis and methanogenesis in mesophilic anaerobic digestion: parameter identification and modeling application

摘要

The effect of temperature on the kinetic parameters involved in the main reactions of thenanaerobic digestion process was studied. Batch tests with starch, glucose and acetic acid asnsubstrates for hydrolysis, acidogenesis and methanogenesis, respectively, were performed in antemperature range between 15 and 458C. First order kinetics was assumed to determine thenhydrolysis rate constant, while Monod and Haldane kinetics were considered for acidogenesisnand methanogenesis, respectively. The results obtained showed that the anaerobic process isnstrongly influenced by temperature, with acidogenesis exerting the highest effect. The CardinalnTemperature Model 1 with an inflection point (CTM1) fitted properly the experimental data in thenwhole temperature range, except for the maximum degradation rate of acidogenesis. A simplencase-study assessing the effect of temperature on an anaerobic CSTR performance indicated thatnwith relatively simple substrates, like starch, the limiting reaction would change depending onntemperature. However, when more complex substrates are used (e.g. sewage sludge), thenhydrolysis might become more quickly into the limiting step.