School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China; Environmental Science Research Institute, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
J Environ Manage. 2019 Dec 1;251:109559. doi: 10.1016/j.jenvman.2019.109559. Epub 2019 Sep 21.
To assess the characteristics of Extracellular Polymeric Substances during natural organic conditioners for sludge treatment, Moringa oleifera (MO) and chitosan (CTS) were used as conditioners. The findings of this study show that despite the high EPS content due to the fact that this component is not destroyed upon conditioning, sludge conditioned with MO and CTS displayed efficient and improved dewaterability. MO and CTS showed the same mechanism of action by protonation of the negatively charged EPS and reduction of electrostatic repulsions between sludge flocs, thus enhancing sludge filterability by neutralizing and settling. The effect of MO and CTS on EPS lies in their ability to neutralize EPS, settling them. MO and CTS neutralize and aggregate the EPS, hence improving sludge dewaterability. The results indicate that CTS can impact the EPS quantity and quality while MO impacts the EPS quality. Understanding the impact of MO and CTS on sludge EPS can help elucidate the mechanism of their dewaterability efficiency.
为了评估在污泥处理过程中天然有机调理剂中胞外聚合物的特性，使用辣木（MO）和壳聚糖（CTS）作为调理剂。本研究的结果表明，尽管 EPS 含量很高，但由于在调理过程中不会破坏该成分，因此用 MO 和 CTS 调理的污泥表现出高效和改善的脱水性能。MO 和 CTS 通过质子化带负电荷的 EPS 和减少污泥絮体之间的静电斥力发挥相同的作用，从而通过中和和沉淀来增强污泥的过滤性。MO 和 CTS 对 EPS 的影响在于它们中和 EPS 的能力，使它们沉淀。MO 和 CTS 中和并聚集 EPS，从而改善污泥的脱水性能。结果表明，CTS 可以影响 EPS 的数量和质量，而 MO 则影响 EPS 的质量。了解 MO 和 CTS 对污泥 EPS 的影响有助于阐明它们的脱水效率机制。
