Effectiveness of Inorganic Amendments in Immobilizing Containminants i n Sewage SludgeReport as inadecuate




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Sewage sludge is inevitable end by-product of sewage treatment. Land application provides a costeffective alternative for sewage sludge disposal. However, the release of contaminants from sewage sludge amended soils is a major source of water quality impairment. Therefore, sewage sludge immobilization seems necessary. In this work, red mud and lime were explored to immobilize the contaminants of sewage sludge. The results showed that red mud and lime could reduce the contaminants release. The results of XRD showed that there were no detectable changes in the mineralogy of sewage sludge after chemical amendments. EDX spectra of many red mud amended sewage sludge particles contained large Al peaks and lime amended sewage sludge particles contained large Ca peaks, while untreated sewage sludge particles showed little Al and Ca.

KEYWORDS

Sewage sludge; Red mud; Lime; Phosphorus; Heavy metals

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Author: Zhen Liang, Lian Yu

Source: http://www.scirp.org/



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