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Specific Determination of Inorganic Monochloramine in Chlorinated Wastewaters

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Abstract:

The two conventional methods for wastewater chloramination control, residual maintenance and oxidation–reduction potential control, are not specific for the desired disinfectant, monochloramine. Organochloramines, nitrite, manganese, and chromate positively interfere with classical residual control measurements. Oxidation–reduction potential control may not be able to distinguish between monochloramine and weaker disinfecting organochloramines typically found in chlorinated domestic wastewaters. A new method of control is presented that is shown to be specific for the inorganic monochloramine species. The new method is based on a modification of the classical Berthelot analysis method for ammonia. Improvements to the method have greatly increased its selectivity toward monochloramine in chlorinated wastewater matrices. Breakpoint chlorination profiles of various chlorinated wastewaters demonstrate that the conventional control methods could potentially overestimate germicidal efficiency, especially near the breakpoint area. The new method has demonstrated good specificity for monochloramine in the samples studied and has been adapted for automated chlorine control in wastewater.
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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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