College of Textile and Clothing, Qingdao University, Qingdao 266071, China.
College of Textile and Clothing, Qingdao University, Qingdao 266071, China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Sci Total Environ. 2019 Mar 15;656:1082-1090. doi: 10.1016/j.scitotenv.2018.11.436. Epub 2018 Nov 29.
The changes of the sludge dewaterability in different thermal treatments and the factors influencing these changes were examined in this study. The experimental results showed that the sludge dewaterability deteriorated by the thermal pretreatment with temperature range from 20 to 170 °C, but the deterioration decreased above a certain temperature threshold (120-150 °C). The factors which affected the dewaterability of thermal-treated sludge in two temperature ranges (20-105 °C and 105-170 °C) were different. The dewaterability of thermal-treated sludge was influenced by the protein, humic acid, and polysaccharide contents of different extracellular polymeric substance fractions and the molecular distribution and fluorescence intensity of tightly bound extracellular polymeric substance in the range from 20 to 105 °C. From 105 to 170 °C, while, the thermal-treated sludge dewaterability was influenced mainly by the α-helix of protein in soluble extracellular polymeric substance. These experimental results provide a new insight into the effect of thermal treatment on sludge dewaterability, which will help guide subsequent research.
本研究考察了不同热处理条件下污泥脱水性能的变化及其影响因素。实验结果表明，温度范围在 20-170°C 的热预处理会使污泥脱水性能恶化，但在一定温度阈值（120-150°C）以上，恶化程度会降低。在两个温度范围（20-105°C 和 105-170°C）内，影响热处理污泥脱水性能的因素不同。在 20-105°C 范围内，热处理污泥的脱水性能受不同胞外聚合物（EPS）组分中蛋白质、腐殖酸和多糖含量以及紧密结合型 EPS 中分子分布和荧光强度的影响；而在 105-170°C 范围内，主要受可溶性 EPS 中蛋白质α-螺旋的影响。这些实验结果为热处理对污泥脱水性能的影响提供了新的认识，有助于指导后续研究。
