Abstract
Electroplating sludge is always listed as hazardous waste due to the high content of heavy metals. The most economical and available way for disposal of sludge is soil application of sludge compost, and the major limitation in agriculture utilization is the total heavy metal contents and their bioavailability to the soil–plant system. The effect of composting on the speciation of heavy metals in an electroplating sludge was studied, and the potential environmental impacts were also assessed. The electroplating sludge was composted with rice straw and sawdust by static aerobic method at high temperature with forced ventilation. Results showed that the exchangeable species of copper and nickel were significantly decreased after the compost procedure, and the other kinds of species were increased differently. Data in this research indicated that composting can reduce the activity of heavy metals to some extent to achieve the agricultural use.
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