Odor removal by powdered activated carbon (PAC) in low turbidity drinking water

摘要

The potential of powdered activated carbon (PAC) adsorption for odor removal in low turbidity drinking water was investigated. The batch experiments were conducted under various conditions including PAC species, dosage, contact time and dosing point. The effects of pre-chlorination and PAC dosage on turbidity were also studied. Results showed that adsorption was quite vulnerable to initial threshold odor number (TON), and higher influent TON required a larger dosage. Both PAC species (derived from coal and wood) presented excellent adsorption capacity for odorants. The adsorption process versus time had three steps and the adsorption kinetics were well fitted by the second order model. Pre-chlorination had an adverse effect on both raw water TON and odor removal. PAC adsorption was enhanced by dosing during coagulation and could, in turn, save coagulant dosage.