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Waste Management & Research
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Compost Detoxification of Vegetable-Tannery Sludge

G. Vallini

CNR, Soil Microbiology Center, Via del Borghetto 80, 56100 Pisa, Italy

A. Pera

CNR, Soil Microbiology Center, Via del Borghetto 80, 56100 Pisa, Italy

F. Cecchi

Department of Environmental Sciences, University of Venice, Venice, Italy

Maria Briglia

CNR, Soil Microbiology Center, Via del Borghetto 80, 56100 Pisa, Italy

Franca Perghem

Department of Chemistry, University of Florence, Florence, and Luigi Sacconi Center, Santa Croce sull'Arno, Italy

The disposal problem represented by vegetable-tannery sludge is of great and ever-increasing concern in Italy. Such sludge is of a highly polluting nature and therefore, requires a reliable and safe treatment to make it harmless before release into the environment. Vegetable-tannery sludge contains some very toxic compounds, mainly polyphenols (i.e. tannins) and sulphides, that are hazardous to biological systems. This paper deals with experiments evaluating the feasibility of vegetable-tannery sludge management and recycling by an integrated composting process. Static windrow technique with forced air and temperature feedback has been adopted for composting a mixture of vegetable-tannery sludge and organic biodegradable fraction of municipal solid waste (MSW) as bulking agent. Physico-chemical, microbiological and phytotoxicological aspects of this compost production from vegetable-tannery sludge are here emphasized along with some technological details.

Key Words: Composting • tannery sludges • municipal solid waste (MSW) • temperature feedback control • forced air aeration • tannin reduction • sulphide removal.

Waste Management & Research, Vol. 7, No. 1, 277-290 (1989)
DOI: 10.1177/0734242X8900700134
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