DENITRATION OF WASTEWATER GENERATED BY NITROSATION OF ORGANIC COMPOUNDS

• Published in: Scientific Study & Research. Chemistry & Chemical Engineering, Biotechnology, Food Industry Vol. 18; no. 4; pp. 407 - 415
• Main Authors: Laskin, Boris M, Vozniuk, Olesia N, Mukhortov, Dmitrii A, Kossoy, Arkadiy A, Kamskaya, Olga I, Blinov, Ilia A, Kambur, Marina P, Petrov, Valentin B
• Format: Journal Article
• Language: English
• Published: Bacau Universitatea "Vasile Alecsandri" din Bacau 01.01.2017; Alma Mater Publishing House "Vasile Alecsandri" University of Bacau
• Subjects: Admixtures; Aqueous solutions; Chemical industry; Chemistry; Decomposition; Denitration; Drying; Heat; Heat treatment; High temperature; Liquid wastes; Methods; Nitrates; Nitric acid; Nitrogen dioxide; Organic compounds; Phase transitions; polymorphic transitions; recycling; sodium hydrogen sulfate; sodium nitrate; Sodium nitrite; sodium sulfate; Sulfuric acid; thermal analysis; Wastewater
• ISSN: 1582-540X; 1582-540X

Subject of the article was to study the method aimed at denitration of liquid wastes that appear during the nitrosation of organic compounds. Liquid waste represents an aqueous solution of sodium sulfate with sodium nitrate and nitrite as admixtures. The method involves addition of sulfuric acid to the wastes followed by drying and thermal treatment of a salt mixture at temperature above 150 °C. Experimental study revealed that sodium nitrite fully decomposes in the solution during the drying resulting in formation of sodium sulfate, nitrogen oxide, and nitrogen dioxide. Solidphase interaction of sodium hydrogen sulfate and sodium nitrate was investigated by combined DSC-TG technique in the temperature range 100 - 270 °C. The mixture of salts was obtained by drying the aqueous solution. It was shown that the reaction rate is defined by the removal rate of vapors formed nitric acid.