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A note on the use of chlorine dioxide vs. chlorine for potable water treatment

Rafael Marín Galvín, José Miguel Rodríguez Mellado

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Abstract

This paper deals with the results achieved by using ClO 2 in the treatment of raw water rich in Mn (more than 0,90 mg/l) during August and September 1991. Removal of Mn (II) by using the conventional process with Cl 2 , yielded treated water in which the Mn residual levels were higher than those prescribed in the Spanish Drinking Water Law (50 μg/l). The use of ClO 2 solved this problem and, at the same time, brought about a reduction in both the UV-absorbance values (at 254 nm) of the water, and the production of THM (trihalomethanes) during the potable water treatment processes. However, the real production cost of potable water increased from $13,0/1 000 m 3 (chlorine) to $27,5/1 000 m 3 (chlorine dioxide)

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What this paper is about

This paper deals with the results achieved by using ClO 2 in the treatment of raw water rich in Mn (more than 0,90 mg/l) during August and September 1991. Removal of Mn (II) by using the conventional process with Cl 2 , yielded treated water in which the Mn residual levels were higher than those prescribed in the Spanish Drinking Water Law (50 μg/l). The use of ClO 2 solved this problem and, at the same time, brought about a reduction in both the UV-absorbance values (at 254 nm) of the water, and the production of THM (trihalomethanes) during the potable water treatment processes. However, the real production cost of potable water increased from $13,0/1 000 m 3 (chlorine) to $27,5/1 000 m 3 (chlorine dioxide)

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Available abstract

This paper deals with the results achieved by using ClO 2 in the treatment of raw water rich in Mn (more than 0,90 mg/l) during August and September 1991. Removal of Mn (II) by using the conventional process with Cl 2 , yielded treated water in which the Mn residual levels were higher than those prescribed in the Spanish Drinking Water Law (50 μg/l). The use of ClO 2 solved this problem and, at the same time, brought about a reduction in both the UV-absorbance values (at 254 nm) of the water, and the production of THM (trihalomethanes) during the potable water treatment processes. However, the real production cost of potable water increased from $13,0/1 000 m 3 (chlorine) to $27,5/1 000 m 3 (chlorine dioxide)

Key concepts: Chlorine dioxide, Potable water, Chlorine, Water treatment, Raw water, Chemistry, Environmental chemistry, Trihalomethane

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