Alkaline thermal sludge hydrolysis.

摘要: Abstract The waste activated sludge (WAS) treatment of wastewater produces excess which needs further prior to disposal or incineration. A reduction in the amount produced, and increased dewaterability are, therefore, subject renewed attention research. lot research covers nature solids associated water. An improved requires disruption cell structure. Previous investigations are reviewed paper. Thermal hydrolysis is recognized as having best potential meet objectives acid thermal most frequently used, despite its serious drawbacks (corrosion, required post-neutralization, solubilization heavy metals phosphates, etc.). Alkaline has been studied a lesser extent, detailed laboratory-scale reported this After assessing effect monovalent/divalent cations (respectively, K + /Na Ca 2+ /Mg ) on dewaterability, only use appears offer solution. effects , Na Mg confirm previous experimental findings. As result investigations, it can be concluded that alkaline using Ca(OH) 2 efficient reducing residual amounts improving dewaterability. fully met at temperature 100 °C; pH≈10 for 60-min reaction time, where all pathogens moreover killed. Under these optimum conditions, rate mechanical dewatering increases (the capillary suction time (CST) value decreased from approximately 34 s initial untreated sample 22 s hydrolyzed sample) DS dewatered reduced 60% amount. DS-content cake will 28 (untreated) 46%. Finally, mass energy balances plant with/without advanced (AST) compared. data clearly illustrate benefits an AST-step system.