EFFECT OF HYDROTHERMAL REACTION CONDITIONS ON FILTRATION PERFORMANCE OF SEWAGE SLUDGE

摘要

Hydrothermal treatment was carried out with sewage sludge, and effect of hydrothermal conditions, such as treatment temperature and treatment period, on dewatering performance by filtration was evaluated. The properties of hydrothermally treated slurry was also analyzed by measuring particle sized distribution, pH and ζ potential to understand physical filtration mechanism.With increasing of treatment temperature, filtration capability of the treated slurry significantly increased. Treatment period also affected on filtration performance, and the filtration performance increased with longer treatment period.Even though particle size decreased with higher treatment temperature by a hydrolysis reaction, the filtration capability increased with increasing hydrothermal treatment temperature or period. The agglomeration effect on the filtration performance might be small, but the characteristic change between particles and filtrate by the decomposition of organic material, such as polysaccharide, might influence the filtration efficiency significantly.