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Zhang F.,Nanjing Normal University | Zhang F.,Jiangsu Engineering Laboratory of Water and Soil Eco Rremediation | Wang F.,Nanjing Normal University | Wang F.,Jiangsu Engineering Laboratory of Water and Soil Eco Rremediation | And 10 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

The leaching toxicity of fly ash from a municipal solid waste incineration(MSWI) plant in Shenzhen was researched according to the different standards of EPA 1311, HJ/T 299-2007, HJ/T 300-2007 and HJ 557-2009. Their stabilization or solidification properties of sixthio guanidine acid (SGA), sodium dimethyl carbamate(SDD) and Ca(OH)2 for the fly ash were compared. The results indicated that the leaching contents of most heavy metals in the fly ash increased with the pH decreasing of leaching liquid, and the leaching contents of Cd, Ni, Pb and Zn exceeded 4.75 times, 1.47 times, 6.72 times and 2.20 times than that of the national hazardous waste identification standard GB5085.3-2007 respectively. From the above research results, the fly ash can be classified to the hazardous waste, and must be stabilized or solidified according to the identification standard of GB5085.3-2007.The results showed that when the dosages of SGA, SDD and Ca(OH)2 were 0.1 mol/kg, 0.5 mol/kg, 0.5 mol/kg, the leaching concentration of heavy metals in the fly ash were less than that of identification standard (GB5085.3-2007), and SGA had a better stabilization or solidification properties for Cd, Cr, Cu and Pb than SDD and Ca(OH)2. Compared with SDD and Ca(OH)2, SGA had an excellent comprehensive property in treating with the heavy metals in the fly ash from the municipal solid waste incineration. Source

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