An improved hybrid strategy for online dosage of hydrogen peroxide in photo-Fenton processes. Issue 3 (June 2021)

• Record Type: Journal Article
• Authors: Xiangwei, Yu; Graells, Moisès; Miralles-Cuevas, Sara; Cabrera-Reina, Alejandro; Pérez-Moya, Montserrat
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 3(2021)
• Publication Date: 2021-06
• Subjects: Photo-Fenton process -- Hydrogen peroxide dosage -- Dissolved oxygen -- Control -- Wastewater; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105235
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: This work addresses the challenge of designing H2 O2 dosage strategies for improving photo-Fenton applications, as well as for further understanding the effect of the dosage. The developed strategy focuses on the limitations of the current solution schemes by adopting a hybrid methodology between open and closed loop approaches and it is based on three different stages: (i) one-shot initial H2 O2 addition (ii) continuous H2 O2 dosage until reaching a specific dissolved oxygen (DO) level and (iii) on-off control of H2 O2 dosage using DO slope as control variable. The proposed strategy is validated in the remediation of a Paracetamol solution (100 mg L −1 ) and the results are assessed using H2 O2 consumption and mineralization rate and level as performance criteria. The final tuning of the proposed strategy consists of: (i) only 40% of the stoichiometric H2 O2 concentration, (ii) continuous feeding of H2 O2 until a 4 mg L −1 DO concentration is attained, and (iii) on-off control dosage selecting DO slope set-points in 0.1 and 0.2 mg L −1 min −1 . These scheme and settings show an improvement of the process performance by ~ 15% with respect to the same H2 O2 amount in a single-addition. This work contributes to improving photo-Fenton operations and designing more efficient processes. Graphical Abstract: ga1 Highlights: A hybrid (open and closed loop) H2O2 dosage strategy has been developed. Dosage stages: 1) initial addition 2) continuous addition and 3) on-off control. Dissolved oxygen slope has been used as the control variable for the on-off control. The scheme allowed improving by ~ 15% the process performance.