UV/H2O2 process performance improvement by ultrafiltration and physicochemical clarification systems for industrial effluent pretreatment

Abstract

The present study evaluated the removal of TOC from an effluent with high organic load resulted from the treatment of oil-water emulsion by thermal process. Hollow Fiber Ultrafiltration membrane (HF-UF) and physicochemical clarification process were used as pretreatment options to assess the influence of feed effluent quality on the UV/H2O2 oxidation process. Results for TOC removals showed HF-UF and physicochemical clarification processes can significantly improve the efficiency of UV/H2O2 oxidation process, when compared with the direct effluent oxidation. Reaction time for obtaining a TOC removal higher than 90% was reduced to approximately half of the time needed when no pretreatment was applied. Considering both pretreatment processes it was not possible to notice any significant difference on the UV/H2O2 oxidation process performance. However, the complexity of physicochemical process due to the use of three different chemicals and sludge production made the HF-UF process the best pretreatment alternative, without increasing the Total Dissolved Solids of the effluent, a very important issue when water reuse is considered

A Competitive Study Using UV and Ozone with H2O2 in Treatment of Oily Wastewater

“…The efficiency of O 3 /H 2 O 2 at the optimum reaction time (20 min) was studied at different pH (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). Figure 6 shows that at pH= 8 , a big change was observed in the removing percentages for oil, COD and TOC (74.48%, 80%, 73.33%) respectively , then the removing percentages were decreased with increasing pH from 10 to12 (62.24 to 59.18 %),(50 to 41.66 %) and (61.33 to 56 % ) respectively.…”

“…Two or more of these free radicals generators can be used in combination to achieve more efficient treatment method (10). Combination of UV and hydrogen peroxide produces hydroxyl radicals by photolysis of H 2 O 2 according to the following reaction (11): H 2 O 2 + hν 2HO• In the UV-H 2 O 2 process, photon energy is high enough to break the chemical bonds of the organic compounds which enables the process to treat wastewater that contains different organic contaminations (12). Also, Ozone is another oxidizing and very reactive agent that can degrade even the persistent hydrocarbon pollutants.…”

H2O2 Based Oxidation Processes for the Treatment of Real High Strength Aqueous Wastes

“…UV radiation is often used in combination with O 3 , H 2 O 2 , Fenton's (H 2 O 2 /Fe 2+ ) reagent and TiO 2 catalyst to accelerate the radical formation and, thus, cause an indirect photolysis [21]. UV-based processes are negatively affected by high turbidity and intensive colour of wastewater [14].…”

Síntesis de Hidróxidos Dobles Laminares MgAlSn y CdS-MgAl y su aplicación en reacciones fotocatalíticas de óxido-reducción

“…Por lo menos el 50% del consumo energético en la reacción se pierde en forma de calor o emisiones alrededor de 185 nm. Otras especies podrían absorber fotones a bajas energías de alrededor de 220 nm como es el caso del peróxido de hidrógeno que actuaría como un filtro de luz disminuyendo la eficiencia de absorción de la radiación, sin embargo, si las especies contaminantes pueden fotolizar directamente esto generaría una mayor eficiencia en los procesos de oxidación (29).…”