Luo Lu, Ge Yongjian, Yuan Shuyu, Yu Yanghai, Shi Zhou, Zhou Shiqing, Deng Jing
Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University Changsha Hunan 410082 P. R. China
China United Engineering Corporation Limited Hangzhou 310052 P. R. China.
RSC Adv. 2019 Sep 2;9(47):27593-27601. doi: 10.1039/c9ra03781k. eCollection 2019 Aug 29.
Ever-increasing efforts have been made to develop rapid and practical conditioning methods of sludge dewatering. This study demonstrated an innovative combination of potassium permanganate (KMnO) and peroxymonosulfate (PMS) for sludge dewatering. The combined use of KMnO and PMS (KMnO/PMS) showed its superiority in improving sludge dewaterability over the separate use of KMnO or PMS. By dosing 4 mmol g VSS KMnO and 3 mmol g VSS PMS, the dewaterability of waste activated sludge (WAS) significantly enhanced as capillary suction time (CST) decreased from 73.65 s to 24.65 s while the water content of dewatered sludge cake ( ) decreased from 78.96% to 70.47%. Apart from CST and , the KMnO/PMS process could also affect negative zeta potential, sludge flocs size and the concentrations of protein and polysaccharide in extracellular polymeric substances (EPS). The enhanced sludge dewaterability and changes of the physicochemical characteristics of the WAS samples during the KMnO/PMS process were actually ascribed to sulfate radicals (SO˙) and hydroxyl radicals (HO˙) generated PMS activation by manganese oxides (MnO ) in the states of MnO and MnO transferred from KMnO oxidation, which was verified by transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) techniques and radical scavenging experiments. Moreover, the Fourier transform infrared spectroscopy (FTIR) analysis further confirmed that the generated SO˙ and HO˙ could improve sludge dewaterability. Thus, the KMnO/PMS process could be considered as a promising conditioning method of sludge dewatering.
人们一直在不断加大努力，开发快速且实用的污泥脱水预处理方法。本研究展示了高锰酸钾（KMnO）和过一硫酸盐（PMS）用于污泥脱水的创新组合。高锰酸钾和过一硫酸盐联合使用（KMnO/PMS）在改善污泥脱水性能方面比单独使用KMnO或PMS更具优势。通过投加4 mmol g VSS的KMnO和3 mmol g VSS的PMS，剩余活性污泥（WAS）的脱水性能显著提高，毛细吸水时间（CST）从73.65秒降至24.65秒，而脱水污泥饼的含水率（ ）从78.96%降至70.47%。除了CST和 ，KMnO/PMS工艺还会影响负ζ电位、污泥絮体大小以及胞外聚合物（EPS）中蛋白质和多糖的浓度。KMnO/PMS工艺中WAS样品脱水性能的提高以及理化特性的变化实际上归因于KMnO氧化过程中转移形成的MnO和MnO状态的锰氧化物（MnO ）对PMS活化产生的硫酸根自由基（SO˙）和羟基自由基（HO˙），这通过透射电子显微镜（TEM）、能量色散X射线光谱（EDX）技术和自由基清除实验得到了验证。此外，傅里叶变换红外光谱（FTIR）分析进一步证实，产生的SO˙和HO˙可以改善污泥脱水性能。因此，KMnO/PMS工艺可被视为一种有前景的污泥脱水预处理方法。
