DSS obtained after anaerobic digestion and thermal drying was
supplied from a sewage disposal plant in Seoul. As pretreatment for
feeding, it was first crushed and sieved to obtain a material with a
diameter of 0.6e3.35 mm. The fraction obtained after sieving was
sufficiently mixed to obtain a homogeneous distribution of
composition and size. Table 1 shows results of the proximate, ultimate,
and caloric value analyses of the DSS.