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Waste Management & Research, Vol. 23, No. 3, 209-219 (2005)
DOI: 10.1177/0734242X05055376

Moisture retention of municipal solid waste mixed with sewage sludge and ash in a semi-arid climate

L. H. Dollar

School of Civil and Environmental Engineering, University of the Witwatersrand, South Africa, ldollar{at}csir.co.za

Mechanisms involved in moisture storage in refuse are explored using data from four sets of experiments in a semi-arid climate. Two laboratory series of experiments contained municipal solid waste (MSW) amended with sewage sludge, one with higher proportions of ash in the MSW than the other. Outdoor experiments contained waste streams with different proportions of ash. Field cells compared moisture retention of refuse and MSW co-disposed with sewage sludge. Sewage sludge at high loads was found to increase the moisture storage relative to unamended MSW. Belt-pressed sludge retained water as bound water that was released by decay and changing pH. Sun-dried sludge also retained more moisture than MSW alone. In gravimetric terms, ash reduced the storage potential of MSW, in laboratory and outdoor experiments. However, outdoor experiments released less leachate from ash-rich refuse than middle-income waste with no ash fraction.

Key Words: Field capacity • inherent moisture • moisture storage • leachate • saturation • water balance • wmr 721-3


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