The De Nora blog: Water Made Easy

Efficacy of Ozone to Reduce Chlorinated Disinfection By-Products

Jun 30, 2020 11:00:00 AM / by De Nora posted in ozone, total trihalomethanes, chlorine demand, natural organic matter, haloacetic acids

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The scientific journal Ozone Science and Engineering published an article entitled: Efficacy of Ozone to Reduce Chlorinated Disinfection By-Products in Quebec (Canada) Drinking Water Facilities, authored by Ladji Meite; Macellin Fotsing and Benoit Barbeau. The following post is a summary of that article.

The impact of ozonation on the reduction of chlorinated disinfection by-products (DBPs) formation was investigated in 15 full-scale Quebec’s WTPs using ozonation as part of their treatment.

The most common locations for the ozonation process were respectively post-ozonation (9), intermediate ozonation (3), and pre-ozonation (3).

Sampling campaigns were replicated for each WTP in warm waters (June–August) as well as cold waters (November–April). Samples were collected before and after full-scale ozonation and were chlorinated in the laboratory to perform DBPs measurements under uniform formation conditions (UFC) tests. A lab-scale ozonation was also performed on each sample to standardize ozonation conditions of all investigated waters. As part of the research, total trihalomethanes (TTHM) and the sum of six haloacetic acids (HAA6) were measured after chlorination 

In full-scale ozonation conditions, TTHM-UFC and HAA6-UFC reductions averaged respectively 27 and 32%. 

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Choosing the Right Water Disinfection

Jun 11, 2020 4:30:00 PM / by De Nora posted in ozone, drinking water, sodium hypochlorite, on-site sodium hypochlorite generation, MIOX, clorate, chlorine dioxide, ultraviolet light, on-site chlorine generation, calcium hypochlorite, chloramines

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Q & A: How to Destroy Pathogens and Micro-pollutants with Ozone?

Jun 9, 2020 8:30:00 AM / by De Nora posted in ozone, pathogens, ozonation, micropollutants

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Utilities face new challenges every day. Where treatment facilities were once expected to simply disinfect water, they must now avoid creating disinfection byproducts during the process. New and more stringent regulations require the removal of additional micro-pollutants and emerging contaminants. But finding the best technology to accomplish these goals can be difficult.

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Ozone Fundamentals for Water Treatment

Jun 8, 2020 3:06:56 PM / by De Nora posted in water treatment, ozone, ozone safety

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Ozone is commonly used in the treatment of drinking water, but not everyone understands what it is, how it’s used, or the benefits and risks associated with it. We created this blog post to provide a brief introduction to Ozone.

How is Ozone Used for Water Treatment?

Ozone is among the most powerful oxidizing agents known to exist. For this reason, it is often used to compliment chlorine disinfection of drinking water. By using ozone, utilities can limit or avoid the use of chlorine if there’s a concern about dangerous byproduct formation. Once introduced to the treatment process, ozone can safely eliminate a wide range of organic compounds and microorganisms.

Stand-alone ozone effectively treats non-biodegradable contaminants, including micropollutants which are substantially untreated through the conventional activated sludge process. Ozone also treats groundwater that has been polluted by metals, like iron and manganese and inorganics, such as hydrogen sulfide (H2S), that are easily oxidated by O3. Ozone can also be used to remove unwanted colors, smells, and flavors from the water.

What is Ozone? 

Ozone is an allotrope of oxygen (different structural modifications of the same element). There
are two main allotropes of oxygen: a diatomic molecule that is made up of two oxygen atoms,
oxygen or dioxygen (O2), and a triatomic molecule made up of three atoms of oxygen, ozone
(O3 ).

Triatomic oxygen (ozone, O3), is an inorganic molecule. As a gas it is pale blue in color with a distinctively pungent smell. This very reactive allotrope is destructive to materials like rubber and fabrics and is also damaging to lung tissue. Traces of it can be detected as a sharp, chlorine-like smell, coming from electric motors, laser printers and photocopiers. It is also the strange odor a person would smell after a thunderstorm.

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Capital Controls® Ozone Generation: Advanced Oxidation for Industrial Water Treatment

Apr 6, 2020 7:15:00 AM / by De Nora posted in water treatment, ozone, wastewater treatment

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Why 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. 

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