Water Treatment
ระบบผลิตน้ำดี และน้ำประปา (Water Treatment System) ระบบกรองน้ำ และระบบผลิตน้ำบริสุทธิ์, ระบบผลิตน้ำสะอาดบรรจุขวด ETPC รับออกแบบและติดตั้งพร้อมจำหน่ายวัสดุอุปกรณ์สำหรับระบบผลิตน้ำดี
Chlorine Dioxide
Chlorine dioxide is used primarily (>95%) for bleaching of wood pulp, but is also used for the bleaching of flour and for the disinfection of municipal drinking water.The Niagara Falls, New York water treatment plant first used chlorine dioxide for drinking water treatment in 1944 for phenol destruction.Chlorine dioxide was introduced as a drinking water disinfectant on a large scale in 1956, when Brussels, Belgium, changed from chlorine to chlorine dioxide. Its most common use in water treatment is as a pre-oxidant prior to chlorination of drinking water to destroy natural water impurities that produce trihalomethanes on exposure to free chlorine. Trihalomethanes are suspect carcinogenic disinfection by-products associated with chlorination of naturally occurring organics in the raw water.
Chlorine dioxide is also superior to chlorine when operating above pH 7, in the presence of ammonia and amines and/or for the control of biofilms in water distribution systems. Chlorine dioxide is used in many industrial water treatment applications as a biocide including cooling towers, process water and food processing.
Chlorine Dioxide generators provide an alternative method of disinfection to storage of bulk chlorine or pressurized chlorine gas. A chlorine dioxide generator utilizing an automated vacuum feed system minimizes the safety concerns ordinarily associated with storing and using bulk sodium hypochlorite, or chlorine gas.
Generation Process:
- Chlorine dioxide is produced via a two stage process under vacuum conditions.
- In the first stage, molecular chlorine gas is generated by reaction of 12.5% sodium hypochlorite solution with 15% hydrochloric acid.
- During the second stage, chlorine gas is reacted with a 25% sodium chlorite solution to produce the final chlorine dioxide.
