EVALUATION OF ORGANIC MATTER AND HEAVY METALS DERIVED FROM THE TANNERY SLUDGE COMPOST
Keywords:
Tannery sludge, compost, humic matter, heavy metalsAbstract
This study focused on the characterization of organic matter (OM) and heavy metals during the composting of tannery sludge. Total concentrations of chromium, zinc, copper, lead, and cadmium in dry compost were reduced and complied with the standards of the Canadian Council of Ministers of the Environment (1995) making the compost suitable for use as a fertilizer and soil conditioner. The composting process significantly produced stable and mature compost and the concentration of the compost organic matter fractions generally decreased during the composting time while the C/N ratio exhibited a decreasing pattern throughout the composting process. Water and solution (0.01 M CaCl₂) soluble organic carbon concentrations rapidly increased to a maximum on the 20th day and declined thereafter. The changes in the humic fractions reveal that the amount of humic acids decreased during the first 20 days and increased thereafter. Reverse trends were observed in the case of fulvic acids (FA). The amounts of FA reached the maximum value on day 20 and declined thereafter.
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