Abstract
The treatment and disposal of municipal solid waste incineration (MSWI) fly ash containing significant amounts of dissolvable salts and heavy metals is a seriously challenge. At present, the common treatment method for MSWI fly ash in Taiwan is the cement-based stabilization/solidification (S/S) process. In this work, an integrated hydrometallurgical process for the treatment of MSWI fly ash was evaluated. Ca was first recovered by combining water washing and ion exchange sequentially. Meanwhile, Zn in the water-washed fly ash was recovered by combining acid leaching and ion exchange sequentially. Combining the water washing efficiency of 30% on raw ash and the acid leaching efficiency of 40% on pre-washed ash, a total of 58% mass reduction rate of fly ash was achieved. In addition, an 80% Zn and 58% Ca recovery was achieved.
Highlights
Incineration is one of the efficient methods in current waste treatment techniques and is capable of achieving volume reduction
CaO or CaCO3 are injected into the furnace to neutralize the emission of acid gases such as HCl and SOx during MSW incineration which led to a high calcium (Ca) content of fly ash
Most of the literatures focuses on the leaching of metals in municipal solid waste incinerator (MSWI) fly ash and discusses the effects of experimental conditions such as reaction time, temperature, leaching reagents used, and the liquid-to-solid ratio
Summary
Incineration is one of the efficient methods in current waste treatment techniques and is capable of achieving volume reduction. One-fifth of the weight of the MSW becomes residues and 23 wt.% of the residues is fly ash. In this manner, 302,000 tons of the MSWI fly ash are produced in Taiwan annually [1]. The common treatment method for MSWI fly ash in Taiwan is the cement-based stabilization/solidification (S/S) process. The wet extraction processes using various reagents [15,16,17,18,19] to achieve fly ash stabilized and metals’ recovery have been investigated. A novel process aiming for the mass reduction and metal recovery of MSWI fly ash was proposed. PT/hOeEsaSmsppleecwtroasmveatceuru. mAlfil ltthraetefdiltrates weraendgaZtnheinretdheafinltdrautesewdasinantahlyezseudbbsyetqhueeInCtPc/OolEuSmspnecetxropmereitmere. nAtlsl.thTehfieltfrialttreastwioenrecgaaktehewreadsadndried to conustsaendtinwtehiegshutbasneqdutehnet cpoelrucmenntesxopleirdimdeisnstos.lvTehde fiwltarsatcioanlccualkaetewda.s dried to constant weight and the percent solid dissolved was calculated
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