Addition of Powdered Activated Carbon to Activated Sludge Reactors.

摘要

Continuous addition of powdered carbon to the aeration vessel of an activated sludge plant has been shown to improve the quality of the effluent stream. Periodic addition of powdered carbon,however,may provide a more practical and economical method to reduce normal peaks in diurnal loads and to control unexpected changes in the entering feed. In this laboratory study,activated sludge reactors were subjected to a variety of feed upsets and powdered carbon was applied as a control mechanism. With glucose as the substrate,addition of carbon only slightly moderated concentration changes during the transient period but decreased the steady state total organic carbon concentrations significantly. Phenol impulses up to 1000mg/l and phenol steps up to 250mg/l did not have adverse long-term effects on the bacteria whereas a phenol step of 1000mg/l killed the culture. For impulse inputs of phenol,the simultaneous addition of carbon greatly reduced the magnitude of the transient changes in concentration. With step inputs of phenol,carbon addition rapidly lowered the phenol concentration in the reactor and permitted continuous operation with inlet phenol concentrations above 1000mg/l.