Treatment of Ash from Municipal Solid Waste Power Plant Using Solidification Technique
Conference proceedings article
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Author list: P Losiri, S Asavapisit and R Piyapanuwat
Publication year: 2023
Start page: 69
End page: 75
Number of pages: 7
Languages: Thai (TH)
Abstract
This research studied treatment of Fly ash (FA) and Bottom ash (BA) from Municipal Solid Waste Power Plant using ordinary Portland cement (OPC) -based solidification technique. The ratios of OPC/ FA and OPC /BA at 100:0, 70:30, 50:50 and 30:70 by wt. were studied. Compressive strength and leachability of heavy metals (Pb, Cd, Mn, Cr, Cu, Ni and Zn), chloride and sulfate from the solidified wastes were investigated at the age of 28 days using Toxicity Characteristic Leaching Procedure and acetic acid solution pH 2.88 as leachant. Results showed that a 28-day strength of the solidified wastes having mix proportions of OPC with FA and BA at 70:30, 50:50 and 30:70 by wt. equals 60, 45, 14 and 53, 44 and 37 kg/cm2 , respectively whereas that of the control sample at the ratio of 100:0 gave strength of 65 kg/cm2 . However, all mix proportions of OPC with FA and BA have compressive strength higher than the standard criteria of the Ministry of Industry (3.5 kg/cm2 ). For leachability of heavy metals determined by the Inductively Coupled Plasma technique found Zn, Pb, Cr, and Cd present in the leachate contacting with all mix proportions of the solidified wastes at concentration lower than the standard criteria of the Ministry of Industry (the standard concentrations of Zn, Pb, Cr and Cd were 5, 5, 5 and 1 mg/L). In addition, concentrations of chloride and sulfate which were analyzed using the Ion Chromatography technique found that the leachate contacting with all mix proportions of the solidified wastes were not exceeding the standard criteria of the Ministry of Industry which defined the concentration of chloride and sulfate are not exceeding 600 and 250 mg/L, respectively.
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