Water-soluble characteristics of chlorine in char derived from municipal solid wastes.
Chlorine in char derived from municipal solid waste (MSW) was characterized and quantified based on its water solubility: easily water-soluble, hardly water-soluble, and non-water-soluble chlorine. For that, a four-cycle process of water-washing, heating or carbonation were carried out. In order to confirm the characteristics of non-water-soluble chlorine, additional thermal treatment and an alkali-acid washing process were applied to washed char. It was found that a large particle size of char (0.5-1.0 mm) significantly contributed to the amount of non-water-soluble chlorine. Pulverization and HNO3-HF digestion were performed to identify a factor to interfere chlorine release from char with a large particle size. Pulverization was proven ineffective for release of non-water-soluble chlorine, whereas approximately 32% of non-water-soluble chlorine was extracted by HNO3-HF digestion. Therefore, the presence of non-water-soluble chlorine is likely to originate from its chemical property rather than simply from its physical one.
Hwang
I H
IH
Laboratory of Solid Waste Disposal Engineering, Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Sapporo 060-8628, Japan.
Matsuto
T
T
Tanaka
N
N
D002244:Carbon / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry* / Q000302:isolation & purification; D010316:Particle Size; D012037:Refuse Disposal / Q000379:methods*; D012995:Solubility; D018505:Waste Management; D014866:Waste Products / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000517:prevention & control*
D014866:Waste Products; D002713:Chlorine; D002244:Carbon