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Role of Ammonia-N in Secondary Effluent Chlorination

Bhupinder S. Dhaliwal and Robert A. Baker
Journal (Water Pollution Control Federation)
Vol. 55, No. 5 (May, 1983), pp. 454-456
Stable URL: http://www.jstor.org/stable/25041904
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Role of Ammonia-N in Secondary Effluent Chlorination
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Abstract

A variety of inorganic and organic constituents of secondary effluent chemically reduce aqueous chlorine; the result is increased chlorine demand. Some of the common inorganic constituents are ${\rm HS}^{-}$, ${\rm SO}^{2-}$, ${\rm SO}_{3}{}^{2-}$, ${\rm NO}_{2}{}^{-}$, ${\rm Fe}^{2+}$, ${\rm Mn}^{2+}$, and ${\rm NH}_{4}{}^{+}$. The organic constituents vary from simple to complex carbohydrates, proteins, fats, and oils. Generally, higher concentrations of these chlorine reactable materials in secondary effluent cause higher chlorine demands and also increase chlorination cost. Unlike other inorganic and organic constituents of secondary effluent, ammonia can increase or decrease chlorine demand, depending on the circumstances. This article discusses conditions under which ammonia increases or decreases secondary effluent chlorine demand and how this changing chlorine demand affects disinfection.

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