College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.
Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Environ Sci Pollut Res Int. 2018 Sep;25(27):27628-27638. doi: 10.1007/s11356-018-2829-x. Epub 2018 Jul 28.
A novel method was explored to improve the waste-activated sludge (WAS) dewaterability using Fe(II) combined with calcium hypochlorite, and the possible mechanisms were investigated simultaneously. Capillary suction time (CST), specific resistance to filtration (SRF) of sludge, and water content (W) of dewatered sludge cake were selected as the factors to evaluate the sludge dewaterability. The maximum reduction of W (30.76%) was achieved under the optimal conditions of Ca(ClO) 0.04 g/g total suspended solids (TSS), FeSO·7HO 0.097 g/g TSS, and pH 7.3, while the reduction of CST and SRF reached 91.24 and 99.47%, respectively. Three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy of extracellular polymeric substances (EPSs) showed that sludge dewaterability was mainly related to the degradation of tryptophan and tyrosine protein-like substances in sludge EPS. Economic analysis suggested Fe(II) combined with calcium hypochlorite treatment had greater potential on enhancing WAS dewaterability compared with the traditional sludge treatment.
采用 Fe(II)联合次氯酸钙的方法来改善剩余活性污泥（WAS）的脱水性能，并对可能的机制进行了研究。通过毛细吸留时间（CST）、污泥比阻（SRF）和脱水污泥饼的水分含量（W）来评估污泥的脱水性能。在最佳条件下（Ca(ClO) 0.04 g/g 总悬浮固体（TSS），FeSO·7HO 0.097 g/g TSS，pH 7.3），W 的最大降幅达到 30.76%，同时 CST 和 SRF 的降幅分别达到 91.24%和 99.47%。通过对胞外聚合物（EPS）的三维激发-发射矩阵（3D-EEM）荧光光谱分析，表明污泥的脱水性能主要与污泥 EPS 中色氨酸和酪氨酸蛋白类物质的降解有关。经济分析表明，与传统的污泥处理相比，Fe(II)联合次氯酸钙处理在提高 WAS 脱水性能方面具有更大的潜力。
