The Effect of Water Characteristic on Disinfection Process by Ozone

Today in Indonesia, The numbers of people, which consume bottle water, have increased. One of the reasons why people use bottle water is that it does not produce unique smell that came from chlorine because they use ozone as disinfectant for bottle water. Ozone is a strong disinfectant, stronger than widely used disinfectants such as chlorine. In water, ozone will decompose into OH radicals which are the strongest oxidants in water (von Gunten, 2003). Since the price of bottle water is expensive, many Indonesian who have limited budget, buy drinking water from small bottle Water Company that called water refill depot. Because the demand of drinking water have increased we can find water refill depot everywhere in Indonesia big city. It is small company that owned individually so that it has inadequate quality control, moreover the supervision of the treated water from the public is limited.
According to the government report, some refill depot product treated water which contain Total Coli and E.Coli. It means disinfection process not optimum. Although Ozone is a strong disinfectant, Ozone is unstable in the water. Stability of ozone in the water is affected by water quality such as pH, turbidity, the type and content of natural organic matter (NOM), inorganic content and alkalinity. The reactions of ozone in water are usually rather complex. In the water, only part of the ozone reacts directly with dissolved solutes, the other part may decompose before reaction (Hoigne, at al., 1983). Water refill depots have used ground water, spring water, and treated water from water treatment plant as raw material. Those sources of water have different characteristic so that they will show different response to ozonation process.
The aim of this research is to find out the influence water characteristic on disinfection process which used ozone. Furthermore, this research will recommend the appropriate water quality for ozonation process and this research will affect the quality of treated water which is produced by water refill depots.

Di buat oleh:  Mohamad Rangga Sururi (rangsoer@yahoo.com), Kancitra Pharmawati (kancitra@yahoo.com), Sofi Widayani (4widayani_ophiesofi@yahoo.com)
Kata Kunci : disinfectants,chlorine, strongest oxidants, characteristic, ozone, characteristic
Keterangan : The 3rd International Conference on Water Supply Management System and Social Capital, Malang, Indonesia.

The Effect of Water Characteristic on Disinfection Process by Ozone.