An application of advanced oxidation process on industrial crude oily wastewater treatment

Abstract

Advanced oxidation process, via photo-catalytic oxidation process was demonstrated in this study as one of the promising techniques of simulated oily wastewater treatment. Several effective factors such as initial oil concentration, catalyst dose, stirring speed (rpm), pH value and hydrogen peroxide (H2O2) dose influencing on the photo-catalytic degradation rate of oily wastewater were investigated. The catalyst used in this work was titanium dioxide (TiO2). The solubility of oil in water was increased using emulsifier. Results indicated that the photo-catalytic oxidation process has a good removal percentage of oil from oily wastewater reached to 98.43% at optimum operating parameters of 1 g/L initial oil concentration, 850 rpm, 8 pH, 3 mL H2O2 and 1.5 g/L of TiO2 after 40 min of irradiation time. The degradation reaction follows a first order kinetics with a correlation coefficient (R2) of 93.7%. Ultimately, the application of photo-catalytic oxidation processes at these optimum operating parameters on an industrial oily wastewater collected from an effluent stream of Ras Shukair at Red See supplied by Asuit Petrochemical Company was done in Egypt. The results showed that the best oil removal (99%) was achieved after adding 3 mL of H2O2 in a reaction time of 40 min compared to without adding H2O2.

A Comprehensive Approach to Azo Dichlorotriazine Dye Treatment: Assessing the Impact of Physical, Chemical, and Biological Treatment Methods through Statistical Analysis of Experimental Data

“…The outcomes indicate that a raise in H 2 O 2 amount from 0.5 to 1.5 mL/L raises the COD removal percent from 40% to 70%. These results also evidenced that the increase in H 2 O 2 amount to more than 1.5 mL/L caused a decrease in the COD removal percent, owing to the spontaneous decomposition of H 2 O 2 to oxygen and water and recombination of OH • radicals [23,31,[33][34][35] as elucidated in Equations ( 7) and ( 8):…”

“…Excess amounts of H 2 O 2 will react with OH • competing with organic pollutants and consequently reducing the COD removal efficacy, and H 2 O 2 itself contributes to the scavenging ability of OH • radicals [23,32,36].…”

“…A lot of examinations have been performed to decolorize dyes using Fenton oxidation, but photo-Fenton, which is also a newly emerged advanced oxidation process, has also been applied to the treatment of dye materials [21]. The adding of the UV radiation to the Fenton process may be an attention-provoking element of the dye elimination owing to its ability to impact the direct formation of OH • radicals, which increases the processing efficiency [22,23]. The formation of OH • radical in the photo-Fenton process is similar to that in the Fenton process in addition to irradiation (UV), which leads to the reduction in Fe 3+ to Fe 2+ as revealed below [24]:…”

Interplay between Catalyst Corrosion and Homogeneous Reactive Oxygen Species in Electrochemical Ozone Production

“…Electrochemical water treatment promises to address the pressing need for sustainable, efficient, and versatile solutions to global clean water scarcity. , Generating disinfectants in situ can potentially lower treatment costs, and electrochemical processes are amenable to intermittent renewable electricity sources. , Within the field of electrochemical water treatment, electrochemical ozone production (EOP, reaction ) is particularly compelling. , Ozone (O 3 ) has been used as a disinfectant in various applications, including water purification and medical sterilization, and its ability to degrade pharmaceutical compounds and contaminants has been successfully demonstrated. − Despite its promise, EOP requires electrocatalysts with improved stability and selectivity to become economically viable. − 3 H 2 normalO → O 3 + 6 H + + 6 e − goodbreak0em2em⁣ E ° = 1.51 .25em normalV .25em v s 0.25em R H E 2 H 2 normalO → O 2 + 4 H + + 4 e − goodbreak0em2em⁣ E ° = 1.23 .25em normalV .25em v s 0.25em R H E 6-e – EOP (eq ) and 4-e – OER (eq…”

Facet-Dependent Fe2O3/BiVO4(110)/BiVO4(010)/Fe2O3 Dual S-Scheme Photocatalyst as an Efficient Visible-Light-Driven Peroxymonosulfate Activator for Norfloxacin Degradation

“…Organic micropollutants generated by industry and consumers, such as pharmaceuticals, pesticides, and personal care products, are of great concern due to their high toxicity, lack of biodegradability, and potential carcinogenic properties. − Due to the persistence of these toxic substances in the environment, the removal of these chemicals from wastewater is necessary and urgent. ,− Conventional methods for removing organic pollutants, such as adsorption and biodegradation, have drawbacks including secondary pollution, long periods of treatment, and poor stability. To address these issues, researchers have turned to advanced oxidation processes (AOPs). − One promising AOP is the heterogeneous Fenton-like reaction, which involves the activation of persulfates [specifically peroxymonosulfate (PMS) and peroxydisulfate (PDS)]. This reaction has garnered significant attention due to its ability to efficiently mineralize persistent organic pollutants in various water environments, even within a wide pH range. − Compared to the hydroxyl radical (·OH) generated in the conventional Fenton system (Fe 2+ /H 2 O 2 ), the sulfate radical (SO 4 ·– ) produced in the persulfates activation method exhibits several advantages.…”