Photoreactor design and CFD modelling of a UV/H₂O₂ process for distillery wastewater treatment

Abstract

A pseudo‐kinetic model for the treatment of a distillery wastewater by the ultraviolet irradiation and hydrogen peroxide process in a continuous tubular photoreactor is developed. There is a scarcity of information on modelling of organic degradation rates based on chemical oxygen demand (COD) and total organic carbon (TOC) in advanced oxidation technologies (AOTs). In this study, the COD and TOC are used as surrogate parameters to design a photoreactor instead of individual concentrations of species. The rate constants for the reaction between COD and TOC with hydroxyl radicals were determined to be 4.9 × 109 and 5.0 × 106 M−1 s−1, respectively. A laminar flow model was simulated to estimate the velocity and residence time of the medium in a cylindrical photoreactor. The model was validated by the experimental data published in the open literature for different concentrations of H2O2 (1, 10, and 100 mM), COD (589, 709, and 850 mg O2 L−1), and TOC (190, 200, and 192 mg C L−1). The optimal value of the inlet hydrogen peroxide concentration was predicted to be 400 mg L−1. Axial and radial concentration distributions of species in the photoreactor were also obtained. At different photoreactor radii (from 50 to 200 mm), the values of radial local volumetric rate of energy absorption (LVREA) were estimated. It was found that a higher LVREA was achieved in the photoreactor space at smaller radii. © 2011 Canadian Society for Chemical Engineering

Slaughterhouse wastewater characteristics, treatment, and management in the meat processing industry: A review on trends and advances

“…Furthermore, AOPs may inactivate microorganisms without adding additional chemicals to the SWW in comparison to other techniques such as chlorination that are commonly used in water disinfection, thus, avoiding the possible formation of hazardous by-products (De Sena et al, 2009;Bustillo-Lecompte et al, 2015). Therefore, AOPs have come handy to be recognized as advanced degradation, water reuse, and pollution control processes showing excellent overall results as complimentary treatment (Tabrizi and Mehrvar, 2004;Mehrvar and Venhuis, 2005;Venhuis and Mehrvar, 2005;Mehrvar and Tabrizi, 2006;Edalatmanesh et al, 2008;De Sena et al, 2009;Cao and Mehrvar, 2011;Barrera et al, 2012;Mohajerani et al, 2012;Bustillo-Lecompte et al, 2013, 2014Hamad et al, 2014;Mowla et al, 2014;Ghafoori et al, 2015).…”

“…The UV/H 2 O 2 process has been found to be effective for SWW treatment. Oxidation and degradation of pollutants by UV/H 2 O 2 rely on hydroxyl radicals ( OH), a highly reactive species produced from the reaction of the H 2 O 2 with the UV light (Tabrizi and Mehrvar, 2004;Mehrvar and Tabrizi, 2006;Edalatmanesh et al, 2008;De Sena et al, 2009;Luiz et al, 2009;Cao and Mehrvar, 2011;Barrera et al, 2012;Mohajerani et al, 2012;Hamad et al, 2014;Mowla et al, 2014;Bustillo-Lecompte et al, 2015;Ghafoori et al, 2015). A schematic diagram of a single lamp UV/H 2 O 2 photoreactor system is presented in Fig.…”

Improvement of ganoderic acid and Ganoderma polysaccharide biosynthesis by Ganoderma lucidum fermentation under the inducement of Cu2+

“…Verglichen mit den beiden bereits betrachteten Gebieten der technischen Photochemie ist die technische Ausrichtung der Advanced Oxidation Processes aufgrund der Anwendungsrelevanz am größten 54. Allerdings ist auch hier wieder festzustellen, dass eine Intensivierung der methodischen Untersuchung und Optimierung der eigentlichen Photoreaktoren wünschenswert wäre.…”

Technische Chemie 2012

“…53) Verglichen mit den beiden bereits betrachteten Gebieten der technischen Photochemie ist die technische Ausrichtung der Advanced Oxidation Processes aufgrund der Anwendungsrelevanz am größten. 54) Allerdings ist auch hier wieder festzustellen, dass eine Intensivierung der methodischen Untersuchung und Optimierung der eigentlichen Photoreaktoren wünschenswert wäre. …”