Abstract
We clarified the characteristics of wood chip composting mixed with sewage sludge compost by comparison with normal bark composting. The carbon decreasing and the nitrogen increasing in wood chip composting mixed with sewage sludge compost were larger than those in normal bark composting. Compost temperatures in wood chip composting were higher than those in usual bark composting. Sewage sludge compost as submaterial increased the exchangeable Mg and the base saturation percentage of the compost compared with the compost using the other submaterials. In wood chip composting, using fermeted fowl dropping and urea for submaterial decreased CEC and temperature due to inactivation of microbial activity compared with using sewage sludge compost. Therefore, it seemed that sewage sludge compost had been suitable for submaterial of wood chip composting.
