Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China.
Jiangsu College of Water Treatment Technology and Material Collaborative Innovation Center, Suzhou, 215009, China.
Environ Sci Pollut Res Int. 2019 Nov;26(33):33838-33846. doi: 10.1007/s11356-018-2351-1. Epub 2018 Jun 15.
FeCl, quick lime, and cationic polyacrylamide (CPAM) were used for excess sludge conditioning from wastewater treatment plant (WWTP) and the dewatering performance by different chemical conditioners was investigated. Experimental results showed that FeCl could make small and concentrated sludge particles. Furthermore, new mineral phase structures for building a dewatering framework were obtained by the addition of quick lime, and the coagulation capacity was enhanced by the formation of colloid hydroxyl polymer, which was induced due to the alkaline environment. In addition, the floc particle size significantly increased after the CPAM dosage. The bound water could be released with the stripping of tightly bound extracellular polymeric substance (EPS). Therefore, the dewatering performance and efficiencies were improved and subsequently the hypothetical sludge deep dewatering process was depicted in accordance with the variation of EPS. However, high-strength refractory organics in sludge filtrates caused by quick lime pyrolysis could lead to the unstable operation of the WWTP, because the relatively high concentrations of organic compounds with benzene were dominant in sludge dewatering filtrates.
FeCl、生石灰和阳离子型聚丙烯酰胺（CPAM）被用于处理污水处理厂（WWTP）的剩余污泥，并研究了不同化学调节剂的脱水性能。实验结果表明，FeCl 可以使污泥颗粒变小且更加浓缩。此外，通过添加生石灰，可以获得新的矿物相结构来构建脱水框架，并且由于碱性环境的形成，胶体羟基聚合物的形成增强了混凝能力。此外，添加 CPAM 后，絮体颗粒尺寸显著增大。随着紧密结合的胞外聚合物（EPS）的去除，结合水可以被释放出来。因此，脱水性能和效率得到了提高，随后根据 EPS 的变化描绘了假设的污泥深度脱水过程。然而，生石灰热解产生的污泥滤液中的高强度难降解有机物可能导致 WWTP 运行不稳定，因为在污泥脱水滤液中，以苯为主的相对高浓度的有机化合物占主导地位。
