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JapanWhy Ozone?
A powerful oxidant with fast reaction time, no added chemicals, and the ability to reduce disinfection byproducts, ozone is an appealing and growing option for the treatment of water and wastewater treatment in industrial settings.
The advanced oxidation process (AOP) with Capital Controls® ozone generation systems oxidizes contaminants in water and wastewater through reactions with highly reactive hydroxyl radicals (OH). This chemical process uses ozone (O3), hydrogen peroxide (H2O2), and/or UV light.
AOP can reduce the concentration of contaminants from several-hundred ppm to less than 5 ppb, rapidly converting contaminants into tiny inorganic molecules. By using the most potent oxidants, AOP can efficiently oxidize most contaminants in water at a diffusion-controlled reaction speed.
Due to its high oxidative capability, the AOP can reduce even the most challenging organic and inorganic contaminants. Sometimes AOP is the only option when traditional biological processes are not sufficient.
AOP can effectively reduce biologically toxic or non-degradable contaminants, such as aromatics, pesticides, petroleum constituents and volatile organic compounds. After undergoing AOP, treated wastewater can be reintroduced into streams or sewage treatment. AOP can also be added to an existing traditional water treatment system to meet changing regulations without redesigning a completely new system.
When ozone is used in the AOP, the most potent oxidants that can be applied in water reduce contaminants with high COD or non-biodegradable molecules. Ozone is also efficient to treat groundwater polluted by metals, such as iron, manganese and hydrogen sulfide (H2S) and could be used as a pre-disinfection treatment process for the destruction of tase and odor compounds. A significant advantage of ozone is that the ultraviolet transmittance (UVT) of the water is irrelevant for ozone treatment; ozone is effective even when the UVT is very low.
Hazardous Materials and Micropollutants
The advanced oxidation process does not add any hazardous materials to the water. Since ozone is one of the most effective oxidizing agents, the formation of byproducts is very low. Micro-pollutants are becoming a serious health concern with more countries taking steps to address this issue. Ozone can treat non-biodegradable products (such as micro-pollutants) that can be missed in traditional treatment processes, and it can contain these harmful substances into more biodegradable materials that are absorbed and decomposed on the biological activated filter.
1,4-dioxane, for example, is a contaminant of emerging concern that is used widely as a stabilizer in certain solvents, paint strippers, greases and waxes. According to US EPA, “1,4-dioxane is a likely human carcinogen and has been found in groundwater at sites throughout the United States. The physical and chemical properties, as well as the behavior of 1,4-dioxane, create challenges for its characterization and treatment. It is highly mobile and does not readily biodegrade in the environment.” Ozone AOP is an effective treatment for 1,4-dioxane.
Capital Controls® Ozone: A Range Of Solutions
De Nora offers flexible ozone solutions, from a single component to a complete packaged system that generates up to 6,000 pounds (113 kg/h) of ozone per day. De Nora experts support customers with on-site piloting and lab-scale testing in containerized pilot packages. Capital Controls® ozone systems use standard, globally-available components, making after-sales support more accessible and quicker.
Source: De Nora Newsletter: Ozone AOP for Industrial Water Treatment, 1/2020