(北京工商大学 食品学院, 北京 100048)
(School of Food and Chemical Engineering, Beijing Technology and Business University, Beijing 100048, China)
为了在大豆废水的降解过程中充分提高甲烷产量,设计L9(34)正交试验,研究微量元素、发酵温度、有机负荷和污泥浓度对大豆废水厌氧发酵产甲烷量的影响,确定各影响因素的主次顺序,并根据正交试验结果进行工艺条件优化研究。实验结果表明:对甲烷产量影响最大的因素是有机负荷,其次是微量元素、污泥浓度,发酵温度影响最小。优化的工艺条件组合为:Co 1mg/L,发酵温度45℃,有机负荷1.52kg COD/(m3·d),接种污泥浓度30.00g VSS/L,在此条件下累积甲烷产量最大为970mL,比未优化组合提高15.10%,累积甲烷产率达344.49mL/(g SCOD),甲烷含量最大为84.12%,SCOD的去除率达到84.00%。
In order to improve the methane production in the process of soybean wastewater degradation, effects of the trace elements,fermentation temperature, organic loading rate, and sludge concentration on the amount of methane produced by anaerobic fermentation of soybean wastewater were studied by the orthogonal experiment. Meanwhile, the effecting order of the factors and optimal technological conditions were confirmed. The results showed that the factors which had the greatest influence on the methane production were organic loading rate, followed by the addition of trace elements and sludge concentration, and the fermentation temperature had the least effect. The optimized combination of technological conditions was as follows:1mg/L Co, fermentation temperature 45℃, organic loading rate 1.52kg COD/(m3·d), and the sludge concentration was 30.00g VSS/L. Under this condition, the cumulative methane production was up to 970mL, which was increased about 15.10%. While the cumulative methane yield, the methane content in the biogas,and the removal rate of soluble chemical oxygen demand (SCOD) were 344.49mL/(g SCOD), 84.12%, and 84.00%, respectively.