USING HUWA-SAN AS ALTERNATIVE DISINFECTING AGENT FOR WATER TREATMENT

Chlorine is strong oxidizing agent. It is widely used as disinfectant in water and wastewater treatment. Huwa-San was produced as a disinfectant for biofilm removal and without formation of byproducts so, it was selected to be studied as alternative disinfecting agent. There was no residual chlorine after the treatment with huwa-san. It was found that the residual chlorine increased with increasing the chlorine dose. The disinfection with huwa-san increased the dissolved oxygen and It has the same effect as chlorine on pH and turbidity. The disinfection by huwa-san was more effective than chlorine in decreasing the iron concentration while chlorination was more effective than huwa-san in minimizing the aluminium concentration and alkalinity especially at the doses 6 and 7 ppm. The chlorination increased the chlorides, total and calcium hardness while huwa-san has no obvious effect on these measurements. The chlorination increased sulfates more than the disinfection by huwa-san. The microbiological data showed that the chlorination was more effective at the low doses than the disinfection by huwa-san. The huwa-san decreased the total colony count from 5000 to 2000 colony forming unit while chlorination inhibited the bacterial growth completely at all the doses. The disinfection by chlorine and huwa-san decreased the total algae count in a dose independent manner. The study covered range of the chlorine and huwa-san doses from 2 ppm to 7 ppm. It was found that the chlorine was more effective microbiologically and in decreasing the iron concentration.