EARTH

[3801-11-07] Transforming MSWI fly ash as a recyclable and value-added glass

Kung Bin Chiu¹, ○Kun Sen Chang¹, Yi Ju Su¹, Cheng Lung Hsu¹, Fang Yu Lu¹, I Ju Chu¹, Tang En Chen¹ (1. National United University, Taiwan, ROC)

Chairman: Jonghyun Lee（Chungnam National University）, Liyuan Chai (Central South University)

Keywords:MSWI; Fly ash; Recycle; Glass; Leaching test

Municipal solid waste incineration (MSWI) fly ash containing hazardous Pb and/or Cd, trace dioxins and high chlorine content is a tough waste and difficult for recycle. An innovative method of transforming MSWI fly ash as a recyclable and value-added glass is presented. A representative MSWI fly ash was sampled and TCLP Pb and water soluble chlorine were 10.3 mg/L (regulatory limit, 5.0 mg/L) and 23.6% respectively. Different ratios of MSWI fly ash mixing with flux (sodium carbonate or potassium carbonate) and silica sand or waste glass were fired around 1,200 to 1,300 °C. The results showed that light green glass can be fabricated at an optimal condition of MSWI fly ash:flux:silica sand or waste glass at 0.3:0.3:0.4, and both of water absorption and porosity was 0%; moreover, refractive index (n_D) was 1.546 (similar to normal glass) and leaching concentrations of Pb and Cd in accordance with ISO 7086 2:2000 test method were ND. The physicochemical property of fabricated glass reveals that MSWI fly ash transforming into a recyclable, safe, and value added product is practicable and can be developed in the near future.