Physical characteristics of raw MSW and hydrothermal treatment products were analyzed based
on Japanese Ministry of Health and Welfare no.95/1977, “"Points of Concern for the Guidance
to Municipal Waste Processing Business". Material moisture contents were obtained by drying
the crushed sample in constant-temperature oven at 105°C, and the ash contents were obtained
by inserting the sample into a constant-temperature oven of 550°C. The ash was then made into
briquette form for analysis in Rigaku ZSX X-Ray Fluorescence equipment to obtain the ash
composition.
The chlorine content analysis of raw MSW and hydrothermal products were differentiated by the
form (solid or liquid) and chlorine type (organic or inorganic). For dry solid material, total
chlorine content analysis was based on Japanese standard JISM8813, “Methods for Coal and
Cokes Elements Analysis” using Eschka method, while organic and inorganic chlorine content
were obtained by first washing the solid with 40 times water addition continued with vacuum
filtration. The organic chlorine in residual solid was then analyzed by Eschka method, while
inorganic chlorine content was obtained by potentiometric titration method.
Liquid materials obtained were condenser water and separated liquid from raw product coming
out from the reactor. Some raw products were still wet and considered to have high moisture
content; therefore a dewatering process by centrifuging was applied and some liquid product was
obtained. In this experiment, Kokusan H-251 centrifuge was used to separate the solid and liquid
product, and the chlorine content and pH of the liquid materials were then analyzed.