P-10　水熱処理を利用した汚泥スラリー化に関する研究

抄録

To test the slurryability of the sludge after hydrothermal pretreated for recovering energy with sludge incineration and sludge transportation of sewage sludge, hydrothermal pretreatments and in turn viscosity measurement/zeta potential measurement of the slurry obtained after drying the pretreated sludge were performed at laboratory-scale. The hydrothermal temperature fell within the range of 393 K-493 K and fixed the pretreatment time to 30 min . For the sludge after hydrothermal pretreatment within ranges of 473 K-513 K the pH value of the sludge was adjusted to 11.0 by adding NaOH. The results showed that the absolute value of zeta potential of the sewage sludge was improved with increasing pretreatment temperature above 473 K. Under hydrothermal condition at 513 K, The addition of NaOH gave a better performance on the fluidity of the pretreated sludge compared to pure hydrothermal pretreatment