Updates to municipal water treatment system using ozone

Renovations begin on water tank032416 city pic 2

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At Wednesday’s city commission meeting, commissioners voted in favor of two water projects in the first portion of the council meeting, which was an action session continued from last week.

In July of 2015, the commission approved a contract with Xylem/Wedeco Water Solutions to provide detailed manufacturing specification and production of specialized ozone replacement equipment located at the water treatment plant. The current ozone equipment was installed in 1995 with a 15-20 year life expectancy and is utilized for disinfection of the city drinking water.

After the initial award totaled $1,387,685, during the manufacturing plan development for the equipment it was discovered that additional changes would be necessary to assure the equipment would function as designed in the city water treatment plant. The original award amount covered the general cost of the building, however, in many respects, the equipment must be custom built to fit in the existing plant. This was not discovered until the final manufacturing details were reviewed.

The changes to plan increase the costs by $111,912 or 8.1 percent and were approved by the commission.

“The whole project, at this point, is waiting for final approval from KDHE,” said Frank Abart, public works director. “We expect probably before the end of next week (they will approve it) and then we will request authority from the city commission to advertise the bids. So, they will set a date and a time to receive bids. … We will let the market determine the actual price of the installation of the equipment.”

In August of 2015 the commission approved a contract with Utility Service Group to rehabilitate two water storage tanks located at the Water Treatment Plant. The tanks were constructed in 1947 and have not been rehabilitated since the early 1980s.

The west tank was recently rehabilitated and put back into service. Inspection of the east tank showed it to be in significantly worse shape than the west tank, for unknown reasons.

All 20 of the roof beams need to be replaced due to significant deterioration, at a cost of $88,000. Two inner structural steel support rings need to be replaced at a cost of $31,400. These rings are essential in supporting the roof beams. The change order request also includes the removal of an old interior painter’s ladder that was falling off the interior tank wall, in the amount of $1,875.

Abart said the difference in the conditions of the two tanks was surprising considering they are side-by-side. He anticipates the east tank to be complete by the end of May.

With one tank temporarily out of commission, that leaves Emporia with 1.5 million less gallons of water in reserve. Abart said the KDHE recommends water districts keep one and a half times the daily amount of water used in reserve.

Abart said Lyon county, which uses five million gallons of water a day, is in need of more water storage but the cost to build a new storage tank similar to the ones they are rehabilitating would cost about $3 million for the tank itself, not including new piping. Having excess water supply is most important when the plant has to temporarily shut down for maintenance. Abart said about once a year the plant pipes and tanks are cleaned of deposit build up, a process which takes about a day and requires the plant to shut down.

The total of the three changes is $121,275 and the additional charges were approved.

In other business:

Commissioners approved a bid from Mies Construction Company, Inc. for the Warren Way project at the price of $1,025,607.95.

In the second portion of the meeting, commissioners discussed:

Tuck pointing the exterior of several city buildings

Updates on the ozone project

A possible airport hanger at Emporia Municipal Airport

Commission goal updates

Ozone used to treat potable water

Vietnam potable water treatment plant expansion includes ozone treatment

Vietnam potable water treatment plant expansion includes ozone treatment

Xylem has secured a $1.3 million contract to provide advanced treatment technology to the Saigon Water Corporation’s Tan Hiep Water Treatment Plant 2 in Vietnam’s capital, Ho Chi Minh City.

Under the contract, Xylem will design, install and commission an expansion of the existing treatment plant, to include the first ozone treatment application in Vietnam.

The upgrade will enable the plant to produce 300,000 m3/day of drinking water for 1.5 million Ho Chi Minh City inhabitants.

The company’s Leopold Type S Underdrain and Wedeco SMOevo ozone system will be used to increase the capacity of the Tan Hiep Water Treatment Plant 2.

Construction on the project upgrade began in Q4 2015 and the plant is expected to be operational by April 2016.

Ho Chi Minh City relies largely on rivers for its public water supply; raw water is taken from the Dong Nai and Sai Gon rivers, both of which are polluted by discharges from residential areas, hospitals, factories, waterway transport vessels, farms, and even garbage dumps, Xylem said.

Truong Khac Hoanh, CEO, Saigon Water Corporation, said: “The Tan Hiep Water Treatment Plant 2 has a key role to play in ensuring the residents of Ho Chi Minh City have access to a clean water supply.”

Utah’s water best in the nation – due to ozone in drinking water

OREM, UTAH (ABC 4 UTAH) – In Utah, water is big business. Especially when it comes to processing it.  For 11 straight years the Central Utah Water Conservancy District has been recognized as being one of the leading plants in its industry.
According to the Partnership for Safe Water the water processed at the CUWCD is the best in the nation.
David Pitcher the Assistant General Manager said, “This process improvement project has made it so that we can provide reliable water that could come out of the tap that most people take for granted.”
The water from Mother Earth and Old Man Winter goes through a series of processes including conventional sedimentation.
“It has been steered in multiple stages decreasing energy that would allow it to develop a particle that will settle out,” said Lead Operator Joe Huish.
“Ozone is a really effective way of getting rid of all those tastes and odors as well as some other benefits that ozone for us,” said Huish. ” For us what it does is it reacts with organics in the water. It does a lot for taste and odors for us and makes us able to make really good tasting water.”
American Water Works Association acknowledged the great tasting water by making it the best in the Intermountain Section Conference, which includes Utah and parts of Idaho.
“We have given ourselves all the tools that there are pretty much to drink the water,” said Huish.
The plant that produces the best water in the state was renamed after the man who took time to teach each one of his employees one thing Huish said, “No complacency ever is our main rule.”
Thursday, the plant was renamed the Don A. Christiansen Regional Water Treatment Plant.
Gene Shawcroft the plants general manager said, “It has received a number of awards that other plants are striving to achieve and that recognizes and symbolizes to us the effort Don made over a career, to make sure we had sufficient water, to make sure we had safe drinking water.”
Some bosses at the plant say none of this could be possible without their employees.
“We are very blessed to have workers, operators who their main objective is to provide safe reliable water that is public health,” said Pitcher.
CUWCD will head to Chicago to participate in the American Water Works Association National Conference water taste testing. The contest will be held in June of 2016.

Drinking water in the USA is getting more expensive

As infrastructure ages and water quality decreases the cost to provide safe drinking water in the USA has increased.  The article below, illustrates various issues that municipal water plants are experiencing to delivery high quality, safe, and reliable drinking water to the customers.

One option to lower chemical costs, improve water quality, and eliminate hard to remove chemicals is ozone.  Follow this link to read more about how ozone can be used in municipal drinking water effectively.

TOLEDO, Ohio (AP) — Standing at the edge of the Great Lakes, the world’s largest surface source of fresh water, this city of 280,000 seems immune from the water-supply problems that bedevil other parts of the country. But even here, the promise of an endless tap can be a mirage.

Algae blooms in Lake Erie, fed by agriculture runoff and overflowing sewers, have become so toxic that they shut down Toledo’s water system in 2014 for two days. The city is considering spending millions of dollars to avoid a repeat.

Similar concerns about water quality are playing out elsewhere. Farm fertilizers, discarded pharmaceuticals, industrial chemicals and even saltwater from rising oceans are seeping into many of the aquifers, reservoirs and rivers that supply Americans with drinking water.

researchers trying to find cost effective methods of treating drinking water
In this Tuesday, Sept. 15, 2015 photo, Thomas Bridgeman, an associate professor in the Department of Environmental Sciences at the University of Toledo, left, along with graduate students Kristen Hebebrand and Ken Gibbons, gather water samples from Lake Erie near the City of Toledo water intake crib, approximately 2.5 miles off the shore of Curtice, Ohio. In the wake of Toledo’s water crisis, Ohio has put limits on when and where farmers can spread fertilizer and manure on fields. (AP Photo/Haraz N. Ghanbari)


Combating these growing threats means cities and towns must tap new water sources, upgrade aging treatment plants and install miles of pipeline, at tremendous cost.

Consider tiny Pretty Prairie, Kansas, less than an hour’s drive west of Wichita, where the water tower and cast-iron pipes need to be replaced and state regulators are calling for a new treatment plant to remove nitrates from farm fertilizers. The fixes could cost the town’s 310 water customers $15,000 each.

Emily Webb never gave a second thought to the town’s water until she became pregnant almost two years ago. That’s when she learned through a notice in the mail that the water could cause what’s known as “blue baby” syndrome, which interferes with the blood’s ability to carry oxygen.

“It just kind of scared me,” she said. “Now we don’t drink it at all.”

Instead, she and her husband stock up on well water from her parents’ home and buy bottled water even though health officials say the risk is limited to infants. When it comes time to buy their first home, she said, they will look somewhere else.

Pretty Prairie’s leaders hope to find a less expensive solution. They say the cost of a new treatment plant would drive people away and threaten the farm town’s survival.

Across the country, small towns and big cities alike are debating how much they can afford to spend to make contaminated water fit for drinking.

Safe drinking water for adults, may not be safe for infants
In this Aug. 19, 2015 photo, Jeremy and Emily Webb hold their son, Oliver, at their home in Pretty Prairie, Kan. Emily never gave a second thought to the town’s water until she became pregnant almost two years ago. That’s when she learned through a notice in the mail that the water could cause “blue baby” syndrome, which interferes with the blood’s ability to carry oxygen. “It just kind of scared me,” she says. “Now we don’t drink it at all.” (AP Photo/Charlie Riedel)


Cash-strapped cities worry that an unfair share of the costs are being pushed onto poor residents. Rural water systems say they can’t expect the few people they serve to pay for multimillion-dollar projects.

The U.S Conference of Mayors, in a report released this summer, found spending by local governments on all water-supply projects nearly doubled to $19 billion between 2000 and 2012. Despite a slowdown in recent years, it remained at an all-time high, the report said.

ozonated Bottled water is stored for safe drinking water
This Aug. 19, 2015 photo shows bottles of drinking water on the kitchen table as Emily Webb reads to her son, Oliver, at their home in Pretty Prairie, Kan. Emily never gave a second thought to the town’s water until she became pregnant almost two years ago. That’s when she learned through a notice in the mail that the water could cause “blue baby” syndrome, which interferes with the blood’s ability to carry oxygen. “It just kind of scared me,” she says. “Now we don’t drink it at all.” (AP Photo/Charlie Riedel)


“We have a real dilemma on our hands,” said Richard Anderson, author of the report. “We know we need to increase spending on water, but many houses can’t afford it, and Congress won’t increase funding.”

In California’s Central Valley, low-income farming communities have gone without clean water for years because they don’t have money to build plants to remove uranium, arsenic and nitrates. Drinking fountains at schools have been put off limits, and families spend a large share of their income on bottled water.

A study released in June by the U.S. Geological Survey found nearly one-fifth of the groundwater used for public drinking systems in California contained excessive levels of potentially toxic contaminants.

Beaches are off limits to keep water systems safe
This Tuesday, Sept. 1, 2015 photo, shows a warning sign for high levels of algal toxins along the beach of Maumee Bay State Park in Oregon, Ohio. Algae blooms in Lake Erie, fed by agriculture runoff and overflowing sewer pipes, have become so toxic that they shut down Toledo’s water system for two days in the summer of 2014 and have the city looking at spending millions to avoid a repeat. (AP Photo/Haraz N. Ghanbari)


Compounding the problem is the drought. Because farmers are using more groundwater for irrigation, contaminants are becoming more concentrated in the aquifers and seeping into new wells.

The drought has pushed Los Angeles to plan for the nation’s largest groundwater cleanup project, a $600 million plan to filter groundwater contaminated with toxic chemicals left over from the aerospace and defense industry. Some of the water will be drawn from polluted wells abandoned 30 years ago.

In the Midwest, where shortages typically have not been a concern, more attention is being paid to farming’s effect on drinking water supplies.

Minnesota’s governor this year ordered farmers to plant vegetation instead of crops along rivers, streams and ditches to filter runoff. The water utility in Des Moines, Iowa’s largest city, is suing three rural counties to force tighter regulations on farm discharges.

And in the wake of Toledo’s water crisis, Ohio has put limits on when and where farmers can spread fertilizer and manure on fields.

“But no one really knows how well that works,” said Chuck Campbell, the city’s water treatment supervisor.

Municipal water treatment intake system for surface water
This Tuesday, Sept. 15, 2015 photo shows the City of Toledo water intake crib, approximately 2.5 miles off the shore of Curtice, Ohio. Algae blooms in Lake Erie, fed by agriculture runoff and overflowing sewer pipes, have become so toxic that they shut down Toledo’s water system for two days in the summer of 2014 and have the city looking at spending millions to avoid a repeat. (AP Photo/Haraz N. Ghanbari)


Given that, the city has spent $5 million in the past year to bolster its ability to cleanse water drawn from Lake Erie. It is planning a renovation that could approach $350 million and include a system that uses ozone gas to destroy toxins produced by the algae. A 56 percent water rate increase is footing most of the bill.

In many coastal areas, rising seas mean saltwater can intrude into underground aquifers and in some cases ruin existing municipal wells. It’s especially problematic in the Southeast, from Hilton Head Island in South Carolina to Florida’s seaside towns near Miami.

“Nature’s calling the shots and we’re reacting,” said Keith London, a city commissioner in Hallandale Beach, Florida, where six of eight freshwater wells are no longer usable.

The city is considering relocating wells, upgrading its treatment plant or buying water from a neighboring town.

The water that comes out of the tap in the oceanside town of Edisto Beach, South Carolina, is so salty that it corrodes dishwashers and washing machines within just a few years, resident Tommy Mann said.

While technically safe to drink, it tastes so bad that the town gives away up to five gallons of purified water a day to residents and vacationers.

Voters narrowly rejected a proposal two years ago that would have doubled water rates to pay for an $8.5 million reverse-osmosis filtering system.

Said Mann: “We’re living in a beautiful little town with Third World water.”

Aging infrastructure of municipal water treatment plants
In this Aug. 19, 2015 photo, the city water tower rises above fertilizer tanks in Pretty Prairie, Kan. The water tower and cast-iron pipes need to be replaced and state regulators are calling for a new treatment plant to remove nitrates from farm fertilizers. (AP Photo/Charlie Riedel)


Municipal Water Treatment with ozone for small to mid-sized plants

Ozone has been used for municipal drinking water continuously in the USA since 1940. Ozone use for drinking water treatment is one of the oldest and most well known uses for ozone worldwide.

Read full page here

As of 2013, at least 277 Water Treatment Plant’s (WTP’s) operating in the USA utilize ozone. This number only includes plants larger than 1 MGD capacity. These plants have a combined combined capacity of 14.5 billion gallons per day with ozone production greater than 600,000 lb/day. Since 1993 at least 55 of these plants have been upgraded, again using ozone technology. Proving that ozone was cost effective and a good solution for the application.

Most ozone use for municipal water is in large water treatment plants. Of the 277 WTP’s of record less than 30 are plants with a capacity of less than 2 MGD. The median WTP implementing ozone is expected to grow from 5 MGD capacity at the end of 1984 to 80 MGP at the end of 2020.

Future of ozone use in municipal drinking water

The future of ozone in WTP’s in the USA is great. The EPA estimates there are over 150,000 municipal WTP’s in the USA. Only ~300 of these WTP’s are using, or planning on using ozone. Most of these plants are large, or very large. Opportunity for ozone use in WTP’s in the USA is untapped.

puplic water system size in the USA

Small to Medium sized WTP’s growth potential in the USA is the greatest. The largest WTP’s are targeted for ozone implementation. Also, the majority of ozone implementation is in large WTP’s. There are many small to medium WTP’s in the USA that could also benefit from ozone use, but are not targeted by the traditional ozone industry. This is the benefit of working with Oxidation Technologies. Our history of industrial and agricultural system integration lends us a great deal of experience integrating medium and large ozone systems that are well suited for medium sized municipalities.


Ozone drinking water plants past and future
* planned WTP’s using ozone, actual future plants expected to be higher (click on image to enlarge)

Image shows that WTP’s started in 10 year spans shown by water treatment capacity

  • It is clear that the average size of WTP using ozone has grown over time
  • Emphasis on small and medium WTP’s has diminished


* planned WTP’s using ozone, actual future plants expected to be higher.(click on image to enlarge)

Image shows that WTP’s started in 10 year spans shown by ozone production.

  • The average size ozone system has grown over time
  • Emphasis on small and medium WTP’s has diminished


Where and why is ozone implemented?

Ozone is used in 42 of the 50 states in the USA. Ozone is used all over the USA for a variety of applications. Ozone use does follow the population trends. The states of California, and Texas are the two largest users of ozone for municipal WTP’s.

Ozone is used to replace traditional oxidations

  • Disinfection (Giardia & viruses)
  • Taste and odor control
  • Reduction of chlorinated DBP’s
  • Removal of color
  • Sulfide oxidation, TOC reduction, Iron and Manganese oxidation
  • Enhance coagulation processes


Municipal water treatment plant with ozone
Other = Hydrogen sulfide oxidation, Oxidation of unnamed materials, enhancing coagulation, iron and/or manganese oxidation, TOC, and “other”


Image shows WTP’s using ozone and the purpose for ozone implementation


  • Ozone use for municipal WTP’s is diverse, and continues to be diverse
  • Only the use of ozone for Disinfection has grown consistently in each decade
  • Ozone use for “Other” has also grown over time, however this is a large group of uses for ozone in one category.

Summary – Ozone use for drinking water is diverse.  Many WTP’s throughout the USA will benifit from ozone in some way.



Will your city or project benefit from ozone use?

This is tough to answer. The best answer we can give, is call our application engineers for more information.

If pre-oxidation is required for water treatment, then yes, ozone would be a great alternative to those chemicals. If disinfection by products are a concern, then yes ozone would be a great alternative to chemicals producing those DBP’s. However, most applications are not this simple, give us a call, we would be glad to help,

Ozone used for city water plant upgrade

City of Clarksville Installs BlueInGreen’s Innovative Ozone Technology

BlueInGreen’s HyDOZ system to provide groundbreaking ozone treatment and industry-leading disinfection at Clarksville Water Treatment Plant

FAYETTEVILLE, Ark. (PRWEB) September 15, 2015

Officials at BlueInGreen, LLC announced the installation of the water treatment company’s innovative HyDOZ® system Tuesday, bringing the world’s most efficient gas dissolution technology to the City of Clarksville, Ark.

The HyDOZ will directly inject dissolved ozone into the city’s water supply, treating up to 24 million gallons per day. By using less water, power and chemicals than conventional systems, the HyDOZ will provide more effective water treatment at a fraction of the cost.

ozone system for water treatment
Ozone System for municipal water

The recent plant expansion project will prepare the city’s water infrastructure to meet the needs of Clarksville’s growing population in the future. By reducing both short and long-term operational costs, the HyDOZ is projected to save the city money for many years to come.

After researching water treatment options, the HyDOZ stood out as the most convenient and cost-effective solution for the city, as well as our operators,” said Plant Manager Roy Young. “Ultimately, this project was designed with Clarksville’s future in mind. And with BlueInGreen, we truly have access to the next generation of water treatment technology.”

Ozone is a great option to reduce chemical costs, improve water quality and save money in small and mid sized municipalities!

In addition to reducing operational costs, the HyDOZ also allows operators at the Clarksville Water Treatment Plant to remotely control the facility’s ozone levels, either manually or automatically. Using the HyDOZ system’s wireless capability, operators are now able to monitor and manage the water treatment process from their laptops, phones and tablets.

Because we have a relatively small staff, we need a technology capable of working even when we’re not there,” Young said. “With the HyDOZ, I can leave the plant, check it from another worksite and know that it’s getting the job done. I love it.”

Since 2004, the Arkansas-based water treatment company has expanded its award-winning core technology into four product lines: the SDOX® – for adaptable aeration, the CDOX® – for precise pH adjustment and the SDOX-CS® – for optimized odor control. The HyDOZ – for dependable disinfection – is BlueInGreen’s most recent solution to hit the market.

With sales representation throughout the United States and Canada, BlueInGreen and its oxygen, carbon dioxide and ozone dissolution systems have been selected, installed and praised by engineers and operators across the country.

We couldn’t be happier that another local municipality has opted to implement our technology,” said BlueInGreen President John Kucharik. “But as our installation list shows, BlueInGreen’s technology isn’t just the best in Arkansas. It’s the best in the world.”

Read full story here

Fargo upgrades water treatment plant implementing ozone treatment

FARGO – Workers have been digging a big hole down by the water treatment plant all summer and soon they’ll be driving pilings 100 feet down into more stable ground.

They’re building the first major expansion to the plant at 435 14th Ave. S. since it was built in 1997 when the city’s population was three-quarters of what it is today.

But they’re also building a sort of insurance policy, said Water Utility Supervisor Troy Hall.

Fargo and communities that buy water from the city get their water from the Red River and Sheyenne River, which sometimes have an excess of naturally-occurring sulfate and bromide, salts that affect the taste and odor, and may cause diarrhea.

The water plant’s current coping mechanism is to change the mix, taking in more water from the river with less salt and less water from the river with more.

Hall said it won’t always be able to do that. Flood outlets in Devils Lake are releasing high-sulfate water there into the Sheyenne so the river is brackish more often, which is OK as long as the Red doesn’t run too low or get brackish as well.

“We were kind of nervous a couple of years back because it was pretty dry,” he said.

The expansion will total 65,000 square feet and cost $103.7 million, more than a quarter of which will be paid by the state. The capacity will increase from 30 million gallons a day to 45 million, some of which will be sold to the city of West Fargo to supplement groundwater. The city’s only customer now is the Cass Rural Water District.

Earth is still being removed from the large area on the north side of the Fargo water treatment plant. Dave Wallis / The Forum

Earth is still being removed from the large area on the north side of the Fargo water treatment plant. Dave Wallis / The Forum

Right mix

The level of salts in the Red and Sheyenne tends to fluctuate throughout the year. When snow melts or rain falls, the naturally brackish water is diluted. When water from Devils Lake enters the Sheyenne or when high water in Lake Traverse prompts the U.S. Army Corps of Engineers to release the water into the Bois De Sioux River, a tributary of the Red, those rivers become more brackish.

Hall said he prefers it when the corps releases water from Orwell Dam near Fergus Falls, Minn., which has better quality.

The water plant was built when the water didn’t get brackish that often, so it wasn’t designed to remove salts. Now, when river water enters the plant, it’s softened with lime, treated with ozone to kill microorganisms and filtered. Hall and his team have managed the mix of Sheyenne and Red water such that residents can rarely tell that the taste of their tap water has changed. They don’t use the Sheyenne half of the year when the salts and other minerals are at their highest.

The water plant has done pretty well so far. In October, Fargo water was named the best in the state at the annual American Water Works Association convention in Fargo. Moorhead also won the state contest in Minnesota.

In Fargo’s new treatment system, the water is filtered of small particles and then forced under high pressure through a membrane, which has pores so small that large molecules cannot pass, only water molecules. Plant staff will still need to mix water from the ozone system with the membrane system to achieve the right taste; earlier tests showed the ozone-treated water tends to clog up the membrane, so it has to work separately. With the two systems working together, the plant has much more flexibility.

Hall said it wasn’t very long ago, 1988 and 1989, when the Red River just stopped flowing and the city had to rely on the Sheyenne River alone, and at that time the Sheyenne wasn’t getting any water from Devils Lake.

If the city had to rely only on the Sheyenne now, tap water might start to taste a little funny.

Ozone in cooling tower case study – a review

A new paper has been released by Absolute Ozone showing the advantage of using ozone for cooling tower treatment.  This paper is a case study showing operational data for a 1-year period of time on a cooling tower in Germany.

One year full-scale study of Ozone Cooling Water Treatment at a German Electric Power Station

This paper presents the operating results of ozone treatment of the water in a cooling system with an open loop containing the following elements:

  • Main cooling water pumps
  • Cooling water storage tanks
  • Distribution manifold to cooling water users
  • Cooling water collecting basins
  • Cooling water recycling pumps
  • Cooling tower

The system reviewed in this paper is the side stream cooling system of a power station in Germany, with a capacity of 1000 m3 /h (4400 US gpm). Operation started in early 1989 and the plant was operated for over 2 years. During this period the following items were analyzed and evaluated:

  • Ozone residual in the water
  • Quality of the cooling water
  • Organic scaling on equipment and piping
  • Material corrosion

For the purpose of analyzing the corrosion, two heat exchangers were installed, with identical ratings but each fitted with tubes of different materials. One unit was in contact with ozonated water, while the other was exposed to water without ozone.

The results of this study are extremely encouraging. The following paper reviews the findings of the 2 year operation.

Follow this link for more information on ozone use in cooling towers, and how Oxidation Technologies can integrate Absolute Ozone Generators into your next cooling tower application successfully.


Simple evaluation of ozone use for wastewater plants

4-Step Test Tells Waste Plants Whether To Use Ozone.

Is ozone useful for zapping micropollutants, or does it leave too many byproducts? A new test aims to find out.

In a study published in the journal Water Research, a team of experts from three European research institutions “present a test to evaluate the suitability of ozone treatment for urban wastewater,” according to a statement from Ecole Polytechnique Federale de Lausanne, which supported that research along with ETH Zurich and Eawag.

Micropollutants are a hot regulatory issue in Switzerland, where environmental overseers called for around 100 wastewater treatment plants to upgrade their treatment technology. Over the next two decades, nearly one in seven Swiss wastewater treatment plants will be overhauled to improve their micropollutant treatment processes.

Plant operators “have to decide whether to use powdered activated carbon to adsorb micropollutants, or ozone to destroy them,” the statement said.

So, how do they pick?

“According to Urs von Gunten who led the study, both approaches have similar efficiencies, but differ in other important ways. Once used, powdered activated carbon is incinerated with the sewage sludge, effectively destroying any adsorbed micropollutants. However, it requires significant maintenance operations. Ozone treatment, by contrast, is easy to automate and clean to handle. Micropollutants are broken apart chemically, and the fragments are then released into the environment,” the statement said.

As the U.S. EPA points out, ozone has drawbacks. “Low dosage may not effectively inactivate some viruses, spores, and cysts. Ozonation is a more complex technology than is chlorine or UV disinfection, requiring complicated equipment and efficient contacting systems.”

So when should it be used? The new test introduced by the European research team gives operators a four-step process for testing whether ozone is a good choice, per the statement:

von Gunten and his team developed a four-step test procedure to assess whether the wastewater from a specific plant can be safely treated with ozone. Not only does it involve assessing the efficiency of micropollutant abatement and the formation of oxidation byproducts, the test also includes a series of biological assays to test the toxicity of the treated wastewater before and after treatment. “The idea is that the test, which will be carried out by a private laboratory, will assist cantonal agencies and federal authorities in deciding how best to upgrade wastewater treatment plants,” he says.

For similar stories, visit Water Online’s Wastewater Disinfection Solutions Center.

Ozone still a viable plan for drinking water

Ozone has long been used to treat drinking water on large and small scale applications.  As the technology becomes more proven over time, it is clear the ozone industry is staying around for the long term.

Recently the community of Emporia City voted to replace their 20 year old ozone system with a brand new ozone system at a cost of $2.6 Million.  Read more about this below:

City Commission approves Ozone replacement equipment request

Posted: Thursday, July 2, 2015 9:15 am | Updated: 9:58 am, Thu Jul 2, 2015.

The Emporia City Commission approved a request authorizing the Public Works Department to proceed with an Ozone Equipment purchase Wednesday afternoon during an active session.

The current equipment at the Water Treatment Plant uses atmospheric air and bubble diffusers and was installed in 1995, with an expected life of 15 to 20 years.

The Ozone equipment and process is the primary disinfection action at the Water Treatment Plant.

“We are replacing a piece of equipment that disinfects our water,” said Mayor Danny Giefer. “Our equipment now is out of date and we need to replace it.”

In the next few months, a qualified contractor will be chosen to install the equipment, which is slated to be completed in 2016, with a project construction cost estimate of $2.6 million.

Assistant City Manager Jim Witt said it was time to replace the old equipment.

“The equipment now is 20-plus years old,” Witt said. “LIke all equipment, parts become the issue. We pride ourselves on quality water and this is the way we can continue to ensure that quality of our water. The amount of $2.6 million is a tremendous amount of money, but it’s the way to go. Ozone replacement is shown to be an effective way to treat and purify water. We have a very efficient timeline and are hoping by the end of 2016, the equipment is all in and we won’t have to worry about it for another 15 to 20 years.”

Read full story HERE