Abstract
The effect of chlorhexidine digluconate (CHG) on the treatment efficiency of activated sludge process has been studied experimentally. Waste water samples containing 0.5 and 2.0 ppm CHG were treated by batch activated sludge process, using activated sludge exposed with 0.2-0.5 ppm CHG and time courses of TOD value, NH4+ concentration and others in the treated waste water were observed. In a case of 0.5 ppm CHG waste water, TOD value in the treated waste water was about 10 ppm and almost the same throughout the experiment for 155 d. NH4+ disappeared completely and was changed into NO3- at 10th h after the starting operation. In a case of 2.0 ppm CHG waste water, TOD value was almost as low as 10 ppm until 12th d after the starting operation, but began to increase sharply after then and got to the same level as the influent concentration, about 40 ppm, at 30th d. Whereas the decrease in NH4+ concentration was only less than 20% even at 24th h after the starting operation. Furthermore, the adsorptivity for CHG on activated sludge was investigated. The result showed that the adsorption of CHG by activated sludge obeyed the Freundlich isotherm equation and the amount of CHG adsorbed on 1 g activated sludge (dry state) in equilibrium concentration of 0.5 ppm CHG was about 8 mg.
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