Heavy metals removal from anaerobically digested sludge by chemical and microbiological methods
Tyagi, R.D.; Couillard, D.; Tran, F.
Environmental Pollution 50(4): 295-316
1988
ISSN/ISBN: 0269-7491 PMID: 15092644 DOI: 10.1016/0269-7491(88)90194-7
Accession: 001607221
The metal removal from anaerobically digested sludge was studied by chemical treament and microbial leaching processes in laboratory reactors. The removal of metals increased with decreased sludge solid concentration and pH. In the acid treatment process, a pH of 1.5 was required to reduce the copper concentration in the sludge to an acceptable level. In the microbial processes mixed culture gave 10% better solubilisation of metals than in single culture. The acid requirement was lower for the microbial process. The cost of sludge treatment in terms of chemicals was found to be decreased by 80% in microbial leaching.