Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China.
Bioresour Technol. 2014 Sep;168:190-7. doi: 10.1016/j.biortech.2014.02.098. Epub 2014 Mar 4.
Contribution rates of factors controlling sludge dewaterability during bioleaching, such as sludge pH, microbial quantity, extracellular polymeric substances (EPS), etc., were investigated in this study. Results showed that the dewaterability of bioleached sludge was jointly enhanced by the growth of Acidithiobacillus sp., the increase of Fe(3+) concentration, the decreases of sludge pH, heterotrophic microorganism quantity change, and the decreases of EPS and bound water contents. Ridge regression analysis further revealed that the contribution rates of microbial quantity change, bound water content and slime EPS content on sludge dewaterability enhancement were 32.50%, 24.24%, and 22.37%, respectively, all of which are dominant factors. Therefore, the enhancement of sludge dewaterability was mainly controlled by microbial quantity change and the decrease of bound water and slime EPS contents during bioleaching.
本研究考察了生物浸出过程中控制污泥脱水性能的因素（如污泥 pH 值、微生物数量、胞外聚合物（EPS）等）的贡献率。结果表明，嗜酸菌的生长、Fe(3+)浓度的增加、污泥 pH 值的降低、异养微生物数量的变化以及 EPS 和结合水含量的降低共同增强了生物浸出污泥的脱水性能。岭回归分析进一步表明，微生物数量变化、结合水含量和粘性 EPS 含量对污泥脱水性能增强的贡献率分别为 32.50%、24.24%和 22.37%，均为主要因素。因此，在生物浸出过程中，污泥脱水性能的增强主要受微生物数量变化以及结合水和粘性 EPS 含量的降低控制。
