IMPROVED ANAEROBIC DIGESTION FOR REMOVAL AND RECOVERY OF PHOPHORUS AND HEAVY METALS FROM SEWAGE SLUDGE

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This study aimed to demonstrate the feasibility of anaerobic digestion with acidic thermal treatment and subsequent phosphorus removal and recovery, when applied to sewage sludge. The results showed improved solids reduction of 15-36% and excellent dewaterability. 22-43% of phosphorus in sewage sludge was able to be released and recovered. Recycle load from sludge treatment to wastewater treatment was insignificant with respect to color and nutrients. Therefore, the anaerobic digestion with acidic thermal treatment can be an attractive alternative for solids reduction and handling, and for phosphorus recovery. Furthermore, heavy metals in the digested sludge were efficiently removed by a bioleaching method.