CHEMICAL REDUCTION OF NITRATES IN THE WASTEWATER FROM 2-EHN PRODUCTION

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Architecture, Civil Engineering, Environment

Silesian University of Technology

Subject: Architecture, Civil Engineering, Engineering, Environmental

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VOLUME 9 , ISSUE 4 (December 2016) > List of articles

CHEMICAL REDUCTION OF NITRATES IN THE WASTEWATER FROM 2-EHN PRODUCTION

Krzysztof BARBUSIŃSKI / Maciej ŻOŁNIERCZYK

Keywords : Chemical reduction, Chemical denitrification, Nitrates, 2-ethylhexyl nitrate

Citation Information : Architecture, Civil Engineering, Environment. Volume 9, Issue 4, Pages 101-106, DOI: https://doi.org/10.21307/acee-2016-056

License : (BY-NC-ND 4.0)

Received Date : 26-October-2016 / Accepted: 07-November-2016 / Published Online: 27-August-2018

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ABSTRACT

The objective of the research was to determine the efficiency of nitrate removal from wastewater from 2-ethylhexyl nitrate production using chemical reduction process. The average concentration of nitrate nitrogen in raw wastewater was about 5.2 g/dm3. The processes of chemical reduction were conducted both in batch and continuous flow reactor under strongly acid conditions using two reducers: steel swarf, as a source of iron, and technical grade urea. In the batch process the maximum degree of nitrate removal equal to 24.4% was obtained in the process modification with pre-digesting of the steel swarf in a concentrated acid. The continuous process was carried out in a single, two- and three-stage system. In order to increase the efficiency of reaction the wastewater was heated to a temperature 70–75°C. The impact of degree of wastewater recirculation, temperature and quantity of steel swarf on the reaction efficiency was evaluated. In optimal conditions (pH<1; temperature in the range of 70–75°C) the maximum degree of nitrate removal equal to 92.2% was obtained in a two-stage system at six times of recirculation of wastewater. However, for economic reasons as the best modification it was a triple-stage system at tenfold recirculation (effectiveness 89.3%), in which the wastewater was heated only to 34°C, i.e. the actual temperature of wastewater from the production of 2-EHN.

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