Abstract
AbstractBioleaching treatments can significantly improve the dewaterability of sewage sludge. However, the exact mechanisms of the improvement of sludge dewaterability by bioleaching are as yet unclear. In this study, the variation of extracellular polymeric substances (EPS) content along with bound water content in sludge during bioleaching was investigated in detail. Results showed that sludge dewaterability was improved rapidly and then deteriorated slowly. The improvement of sludge dewaterability in the first 48 h of bioleaching was primarily attributable to the removal of sludge EPS, and the deterioration of sludge dewaterability in the following 144 h primarily resulted from the unexpected increase of sludge EPS amount in the latter stage of the bioleaching treatment. The Spearman correlation coefficients of EPS content and bound water content, EPS content and the specific resistance to filtration (SRF), and bound water content and SRF were 0.81, 0.83, and 0.94, respectively. Furthermore, the dewate...
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