Experimental study of the removal NOx and SO2 from flue gas using the O3/H2O2, and O3/UV processes

ABSTRACTThe study investigates the effect of different parameters for the removal of SO2 and NOx through a wet process concurrently. Two separate processes have been compared for the removal of flue gases, that is, Ozone/UV and H2O2/UV. The research aims to develop a comparative study for the removal of SO2 and NOx simultaneously using Ozone/H2O2 and UV light and find the energy consumption (also known as EEO) for each process. Combining UV with O3 and H2O2 play a crucial role in generating hydroxyl radicals. Different combinations of Ozone/H2O2, flue gas, and UV intensity were studied at different pH and temperatures of the solution to achieve maximum removal of the flue gases. For, the ozonation process it was observed that the removal% of flue gases increases with increasing UV intensity, and at higher UV intensity (250 W), the removal% for NOx is 92% and SO2 is 95% simultaneously at optimum temperature 308 K. For H2O2/UV process (250 W UV intensity), removal% for NOx is 95% and SO2 is 100% at 313 K, 0.3 LPM flow rate of flue gases. The EEO values obtained for both processes were less than 1 for 95% NOx/SO2 removal efficiency.KEYWORDS: Energy calculationflue gashydroxyl radicalsozonationUV intensity AcknowledgementsThe authors deeply thank DST-SERB for providing full financial support Under Early Career Grant through grant number ECR/2017/001475, and Ahmedabad University for financial support for the extension of the work through seed grant number URBSEASI20A1/SG/19-20/04_SK_01.21. We are grateful to Ahmedabad University for extending the basic research facility, and utility required for the work.Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThere is no special data required to share. All data and calculations have been shared in the form of Figures and Tables. Authors will share further data if required, upon request.Additional informationFundingThe equipment and experimental setup used for work have been financially supported by the Science and Engineering Research Board, Department of Science and Technology (DST-SERB), India, under the Early Career Grant (ECR) through grant number ECR/2017/001475. The consumables have been supported by Ahmedabad University through the seed grant number URBSEASI20A1/SG/19-20/04_SK_01.21; the PhD research fellow, Parveen Dalal is receiving financial support from Ahmedabad University to work on this project.