빗물활용을 위한 간이소독에 대한 연구

In this study, water quality characteristics in rainwater samples was analyzed to examine the microbial risk of rainwater for utilization. Unlike the quality of ground water and surface water, only a few total colonies have found in the precipitation samples. Many colony which inhabits in rainwater(rain-off) was found. It was examine water quality of rainwater. The study covers six months monitoring period. pH varied from 3.2 to 7.6 and color ranged from 20 to 60 CU. Turbidity was below 50NTU. The coliforms number ranged from 1000 to 41,111 number/ml. In the present study, a feasibility of an advanced oxidation using Plasma, Ozone, UV process for rainwater reclamation was investigated. Plasma, Ozone, UV process were introduced as a disinfection method to increase the killing effect for microorganisms. Contact time was changed from 3min to 20min to determine the optimum operation condition for the system. Increasing contact time, The coliforms number and the total colonies number was rapidly decreased. It is interesting to note that a 100% reduction in total coliforms and total colonies were achieved. Total coliforms and total colonies were successfully inactivated to the level of satisfying. Besides disinfection of the coliforms, approximately a 50% removal in DOC was pronounced at a contact time of 10min. More than 90% removal in turbidity, ss and color was also observed at a contact time of 10min with plasma. The application of plasma appeared to be one of options to reuse rainwater.