Abstract:The use of bioleaching for anaerobically digested sludge (ADS) was found to be ineffective compared to using it for undigested sludge (UDS) for reasons elucidated in this study. Results showed that specific resistance to filtration of ADS increased during bioleaching. The pH value of ADS increased to 7.97 and remained unchanged during bioleaching, while it decreased to 2.98 for UDS. Added Fe2+ was not detected as the energy source for ADS. Higher alkalinity and unavailable Fe2+ in ADS prevented the growth of t… Show more
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