Ozone Effect on Nitrogenous Matter in Effluents

by Nava Narkis, Sr. Lect.; Environmental Engrg. Research Center, Faculty of Civ. Engrg., Technion, Israel Inst. of Tech., Haifa, Israel,
Malka Schneider, Research Chemist; Environmental Engrg. Research Center, Faculty of Civ. Engrg., Technion, Israel Inst. of Tech., Haifa, Israel,
Alberto M. Wachs, Abel Wolman Prof. of San. Engrg.; Environmental Engrg. Research Center, Faculty of Civ. Engrg., Technion, Israel Inst. of Tech., Haifa, Israel,


Serial Information: Journal of the Environmental Engineering Division, 1977, Vol. 103, Issue 5, Pg. 877-891


Document Type: Journal Paper

Abstract: A study of the effect of ozone on various nitrogenous compounds found in effluents was undertaken using two systems: (1)Effluents after lime treatment; and (2)solutions of specific nitrogenous compounds in distilled water. Ammonia is only partially nitrified. The higher the pH, and the longer the period of ozonation, the greater the amount of nitrate formed. Nitrates are produced by the complete oxidation of nitrites and by the incomplete oxidation of ammonia and organic nitrogen. In buffered solutions the oxidation of nitrogenous compounds by ozone is more intensive, since the pH of the solution can be maintained at optimal levels. In the case of organic-N it seems that part of it is oxidized directly, or via nitrites, to nitrates, and that some of it is converted to ammonia which can further be oxidized to nitrates. A decrease in COD took place concurrently with the oxidation of ammonia. The oxidation by ozonation of the ammonia that might be found in non-nitrified effluents of biological treatment, requires considerable quantities of ozone.

Subject Headings: Nitrogen | Ammonia | Oxidation | Ozone | Nitrates | Effluents | Water treatment | pH

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