Ozone removes micropolluants from wastewater

Wastewater treatment for micropollutants is becoming more popular and important worldwide. As the concerns of pharmaceuticals in water comes to the forefront the desire for cleaner, safer water is understood. This leads to the implementation of systems to remove micropollutants from wastewater during the treatment process. Ozone is one technology that has proven effective to remove micropollutants and pharmaceuticals from wastewater. Article below gives some great information on another new plant upgrading to ozone use.

Learn more about ozone use for wastewater and micorpollutnats HERE

Full news article HERE

Swiss wastewater plant chooses Xylem’s ozone tech to remove micropollutants

SCHAFFHAUSEN, Switzerland – Xylem (NYSE: XYL) has been awarded a contract to provide advanced treatment technology to the Werdhölzli wastewater treatment plant in Zurich, the largest wastewater treatment facility in Switzerland.

The European Union (EU) has published a list of prioritised substances that pose a threat to ground and surface water sources. To adhere to the environmental standards set by the EU, the member countries have to regularly monitor the occurrence of the listed substances.

In Switzerland, a 20-year process to upgrade major wastewater treatment plants is underway to tackle such pollutants, which currently remain in treated wastewater and are released into surrounding lakes and rivers.

As part of this agenda, new legislation came into effect on 1 January 2016 requiring wastewater treatment plants to implement an additional treatment process, specifically for the removal of micropollutants.

Xylem said its ozone technology will enable the plant to meet new Swiss regulations regarding the protection of water bodies and specifically, the removal of micropollutants.

Eight Wedeco SMOevo ozone systems will be supplied to the Werdhoelzli wastewater treatment plant as part of a 50 million CHF (51.17 million USD) upgrade project.

Once operational, the plant will be able to produce 153 kilograms of ozone per hour (kgO3/h)  to treat a  flow of 6,500 litres per second (l/s), making it the largest ozone plant for the removal of micropollutants in the world.

Growing concern about micropollutants – contaminants that are released from everyday products such as industrial chemicals, pharmaceuticals and personal care products (PPCPs), pesticides, and hormones, and cannot be removed with conventional wastewater treatment technologies – is leading many countries to consider more rigorous treatment solutions.

Peter Wiederkehr, chief operating officer (COO) Entsorgung + Recycling Zürich, said: “Wastewater treatment plants serving a population of 5,000 or more must be equipped now with a new treatment stage which ensures that up to 80% of pre-selected micropollutants are removed. Extensive research has confirmed ozone as a preferred technology for this stage. Xylem’s Wedeco SMOevo ozone systems will enable us to meet the new treatment regulations with a reliable, environmentally-friendly and cost-effective solution.”

Florian Milz, key account manager with Xylem added, “The elimination of micropollutants from wastewater is a challenge which more and more facilities must address. While conventional treatment processes do not remove them completely, oxidation with ozone is proving to be one of the most efficient methods for reducing these contaminants. Pollutants, colored substances, odors and microorganisms are directly destroyed by oxidation, without creating harmful chlorinated by-products or significant residues.”

Construction on the Werdhölzli wastewater treatment plant upgrade began in 2016 and the plant is expected to be operational by 2018.

Ozone for pest control in stored grain

Ozone can be used as a fumigant in grain that is stored over long periods of time.  Ozone has been tested and proven effective in a variety of grains.

High levels of ozone can become irritating for insects, or kill them all together via oxidation.  While low levels of ozone over extended periods of time will keep insects from entering the bin, or starve the insects that do happen to be in the bin.  Ozone will eliminate all odor from the grain and make it impossible for insects to find or become attracted to the grain.

Below see a diagram of how ozone is produced and injected into a grain bin to maintain a low level of ozone.
Ozone as an insictacide for grain

Click here for more info on ozone in grain treatment

The paper below is a great example of testing done by Purdue University on the effectiveness of ozone as a fumigant in grain.  This paper proved that ozone can kill insects at high levels.

For information on how to implement ozone into your grain storage click HERE.

Ozone: A new control strategy for stored grain

L.J. Mason1*, C.P. Woloshuk2
, F. Mendoza2
, D.E. Maier3
, S.A. Kells


Due to the Montreal Protocol, pesticide resistance and the increased demand for organic grains, food  manufacturers and grain handlers are looking for new ways to control insects and pathogens in stored  commodities. Ozone, a powerful oxidant, has numerous beneficial applications. We have evaluated the efficacy of ozone to control pests of stored grain, the flow characteristics of ozone through various grains and the effects of long exposure times to higher concentrations on the chemical composition and processing performance of various food quality grains. A summary of this work will be presented as well as a discussion of other potential uses for this alternative pest treatment.

Key words: Ozone, Insect Pests, Fungal Pests, Fumigation Alternative,

Full paper HERE

Ozone Leak Detection

Tech Tip.

Ozone Leak Detection is an inevitable part of operating any long term ozone system.  As with any toxic gas used for industrial and commercial applications eventually fittings, piping, and parts will eventually fail, allowing that toxic gas, in this case ozone, to leak.  What makes ozone slightly more challenging is the difficulty to measure ozone.  Ozone detectors have to measure a oxidant that is slowly destroying the very sensor intended for finding the ozone gas.  The short half life of ozone is also challenging.  Now it is there, later it is not.  Is there really a leak?

Below is a link to an article written by Eco-Sensors a manufacturer of ozone sensors.

Tips for Measuring Ozone in an Occupied Room

Here are some helpful tips for finding ozone leaks:

Use a high quality ozone sensor.  To find an ozone leak use an ozone sensor that responds quickly to ozone.  We suggest the C-16, or the A-21ZX.  See information in hyper links for details.  Both of these sensors will react quickly to ozone, and can help pinpoint the ozone leak.  The C-16 uses a probe that can pinpoint exact location.  This is our personal favorite ozone sensor.

Turn down the ozone.  The ozone level in the room can quickly become dangerously high limiting your time in the room to find the ozone leak.  Try turning the ozone generator down to the lowest level to produce less ozone and give yourself more time.

Turn off the ozone.  It may be necessary to turn off the ozone all together.  Keep your feed-gas operational but turn off the ozone generator.  Use a bottle of soapy water, and some patience.  you will eventually find the gas leaking by seeing bubbles forming near the fitting or piping.

Use common sense.  If your still not winning the battle, step back and think this through.  Where will ozone most likely be leaking?  Are there any pipes or hoses that commonly have vibration or movement, these would be most likely to spring a leak.  Are there components or fittings that have recently been opened?  Concentrate your efforts on threaded fittings, and push type fittings.  These are most common leaks.


Most of all take your time and be patient.

Also, feel free to give us a call, we would be glad to share our experience with you.


A-21ZX Ozone Sensor
A-21ZX Ozone Sensor – $679
C-16 PortaSens II Gas Detector
C-16 Ozone Leak Sensor – $1495


Aeroqual updates the handheld monitors

Handheld Monitors Get A Refresh

We’re launching new features on our handheld monitors today: the Series 200, 300, 500.

Our handheld monitors are used the world over and in every kind of application from the factories of Samsung in Korea to the oilfields of Kuwait, not to mention Antarctica! The versatility of interchangeable sensor heads means they can be used for precise indoor and outdoor air quality measurements, as well as for industrial health and safety.

Notable new features include:

  • All monitors are now compatible with our IAQ survey sensor heads, meaning that our entire handheld range can be configured to measure 5 parameters simultaneously: CO, CO2, VOC, temp/RH,
  • All monitors can now be upgraded to measure temp/RH in the field simply by adding our plug and play temp/RH sensor,
  • The S300 and S500 now have location ID, so you can link measurements to a specific location – great for IAQ or environmental surveying,
  • The S300 and S500 now benefit from monitor ID so that when you connect them to your PC you’ll be able to sort the data coming off as many as 99 different monitors,
  • The S500, our top of the line monitor, gets a whopping 100% memory upgrade, allowing you to store even more data than before,
  • Finally, just to show we’re up with the play, the handheld PC software is now compatible with Windows 8.

See our full line of Aeroqual Handheld Ozone Monitors HERE