What are the working process of the AOP in water treatment plants?
Advanced oxidation processes (AOPs) are the most appealing and advantageous option, for effectively removing organic pollutants from wastewater. Many harmful chemicals have been identified in the environment, in the released effluent from industries. These chemicals are toxic to both humans and aquatic biota. They have the potential to cause severe harm to both humans and the marine environment.
As a result, there is an urgent need to treat toxic pollutants with an appropriate treatment option. As a result, AOPs are well suited for the treatment of wastewater containing hazardous chemicals. Let's understand the working of advanced oxidation processes.
Working of Advanced Oxidation Process
AOP is an aqueous phase oxidation method, which uses highly reactive species in the oxidative destruction of target pollutants. AOP generates hydroxyl radicals in the water, which are a more powerful and less selective secondary oxidant. Most organic compounds can be oxidized by this secondary oxidant, until they are fully mineralized as carbon dioxide and water.
The hydroxyl radical has a significantly higher oxidation potential than ozone or hydrogen peroxide, and typically reacts one million times faster, resulting in a shorter contact time and footprint.
AOP combinations include
• UV / H2O2
• UV / O3 / H2O2
Photochemical AOPs are frequently used as an effective barrier, to organic pollutant oxidation in wastewater. UV radiation combined with the hydrogen peroxide (H2O2) reaction, confirms the removal of a broader range of compounds. UV alone, UV/H2O2, UV/Fe2+, UV/H2O2/Fe2+, UV/O3, UV/S2O82-, UV/TiO2, UV/chlorine, and UV with other photocatalysts, are the most commonly used photochemical AOPs. As a result, UV AOPs can achieve higher removal rates with both hydroxyl and sulphate radicals.
But, when compared to direct UV photocatalysis, the overall rates of oxidation for all organic pollutants will increase in the presence of H2O2. Therefore, the addition of H2O2to the photolysis process is critical for enhanced elimination efficiency, because it promotes the degradation of micropollutants in wastewater. The radical species are produced by electron transfer in metal oxidation of oxidants, photolysis of H2O2, thermolysis of H2O2, and heterogeneous TiO2 photocatalysis.
Application of AOPs
As a result of industrial pressures, the use of AOPs in water treatment is growing for a variety of critical users, including the oxidation or removal of:
· Water Management in Municipal and Industrial Settings
· Chemical industry
· EDCs (Endocrine Disrupting Compounds)
· PCPs (Personal Care Products)
· Toxic substances
· Smell, colour, and taste
· Persistent Organic matter
These contaminants are well-known threats to aquatic ecosystems and human health, and they have become a major concern for water utilities worldwide.
Existing wastewater treatment practices struggle to eliminate these pollutants, while meeting current and future regulations. AOPs have proven to be an effective solution for the removal of these persistent organics, due to their high oxidation potential.
AOP systems use or combine two or more, oxidizing agents, to create hydroxyl radicals, which is the ultimate oxidant for the elimination of organic pollutants. Netsol Water design and manufacture the widest range of ultraviolet, ozone, and AOP systems, incorporating the most sophisticated technologies available, to meet the needs of industrial and municipal customers. Our experts partner with customers to achieve the best overall answer, to meet treatment requirements safely and economically.
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