Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 27, Pages 27628-27638Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-2829-x
Keywords
Waste activated sludge (WAS); Calcium hypochlorite; Dewaterability; Extracellular polymeric substance (EPS); Three-dimensional excitation-emission matrix (3D-EEM); Protein-like substances
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Funding
- National Natural Science Foundation of China (NSFC) [51779088, 51709104]
- Natural Science Foundation of Hunan Province [2017JJ3148]
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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-C) of dewatered sludge cake were selected as the factors to evaluate the sludge dewaterability. The maximum reduction of W-C (30.76%) was achieved under the optimal conditions of Ca(ClO)(2) 0.04 g/g total suspended solids (TSS), FeSO4 center dot 7H(2)O 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.
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