DESALTING AND WATER TREATMENT MEMBRANE

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DESALTING AND WATER TREATMENT MEMBRANE ( desalting-and-water-treatment-membrane )

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Table 4.2. - Proportional distribution of halogen species. PH Chlorine 3.0 X2 HOX ox- 0.7 99.3 0.0 5.6 0.04 98.5 1.4 8.6 0.0 6.5 93.5 Bromine 3.0 63.1 36.9 0.0 5.6 7.9 92.0 0.1 6.6 0.0 0.0 Most all IOdkE 3.0 5.6 8.6 99.5 0.5 0.0 91.o 9.0 0.0 0.0 0.0 100.0 (From McCutchan and Glater, 1990) 4.4.4.2 Ozone and Ultraviolet Light. - Ozone, an aggressive oxidant, is useful for color removal, taste and odor removal, disinfection, iron and manganese removal, phenol oxidation, and cyanide oxidation (Weber, 1972). When used in RO systems, ozone is bubbled into the feed water allowing sufficient time for reaction. Ultraviolet light is then used to remove excess ozone before the feed water enters the membrane modules (Zoccolante, 1990). UV irradiation also can be used as a disinfectant, but is only active while the water is exposed to the light. Organisms that survive exposure can recontaminate the system. When used with ozone, however, irradiation has a synergistic effect. When a parts per million limit is set for oxidant tolerance, it is usually given as mg/L chlorine or equivalent tolerance. Chlorine (Cl,) has a molecular weight of 70.9 and ozone (0,) has a molecular weight of 48.0, a ratio of 1:0.67. Oxidative effects are proportional to the number of molecules available; therefore, membranes that can tolerate 0.1 mgL chlorine can only tolerate 0.067 mg/L ozone. 4.5 Applications Nanofdtration membranes are used in Florida for treating hard ground water. In tests with 100- to 500-MWCO nanolilters, organics, color, and hardness were rejected at 85 to 95 percent (Watson and Hornburg, 1989). Nanofilters can be operated at lower applied pressure and, if the sodium concentration is acceptable, are an option for removing hardness. RO is used for desalting brackish water or seawater. Because demand for water is increasing, many coastal communities are beginning to hire companies to build desalting facilities and then buy water from them. In Santa Barbara, California, where prolonged drought has threatened the water supply, city officials contracted with Ionics, Inc. of

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