Top-quality drinking water through ozone treatment

It can be argued that drinking water is the most important sustenance that humans need. Its preparation requires complex processes. To oxidize and disinfect drinking water in the course of treatment, ozone is often mixed in. Because of its high reactivity, ozone must be produced and added on-site under strict safety regulations. With that in mind, VEGA’s pressure transducers make an important contribution to the continuous processing of top-quality drinking water.

The water supply system in Baden-Württemberg is one of the largest and most traditionally far-reaching water supplies in Germany. Around 250 cities and municipalities are supplied with about 90 million cubic meters of drinking water every year. The quality of water, and a high level of security of supply take center stage in the regional water supply’s management.

At the beginning of the 20th century, the population in the central Neckar region was already growing rapidly as industrialization progressed. An extraordinarily far-sighted plan at the time was to bring drinking water from the Danube Valley at the city of Ulm in the Remstal region, to Stuttgart. This laid the foundation for the regional water supply system. Plant for the conversion of river water to drinking water consists of a raw water pump, which draws the water directly from the river, a pressure pipe from the pumping station to the waterworks, and the treatment facilities in the waterworks.

In peak times, up to 2,300 liters of river water per second can be converted into drinking water. The injection of highly active oxygen (ozone) for oxidation and disinfection during drinking water treatment represents state-of-the-art technology. Ozone oxidizes dissolved and particulate organic matter and kills or inactivates existing microorganisms. Ozone is always formed when some type of energy decomposes molecular oxygen into individual oxygen atoms, which then react with molecular oxygen to form ozone. This can occur through UV radiation, lightning strikes and also high-voltage electrical discharges.

Because of its high reactivity, ozone is produced, transported and added to the water on the spot and in compliance with strict safety regulations. The actual production process takes place in pressurized reactors, where electrical energy is applied to convert oxygen into ozone. Then, the resulting gas mixture flows into an ozone collecting pipe. The maximum ozone concentration is about 180 g/Nm³ at an operating pressure of 1.3 bar. Injectors feed the ozone into the water, while mixers distribute the tiny ozone bubbles evenly throughout the water volume. For a few minutes, the water remains in large containers during which time oxidation and disinfection take place.

To ensure that pressure measurement in the ozone collection pipe and at other important measuring points is safe and reliable, the engineering department decided to use VEGAbar 82, the pressure transmitter with ceramic Certec measuring cell and a second line of defense. This is an additional process separation by means of a gas-tight feedthrough above the process connection. Although the measuring cell is permanently resistant to ozone, the second line of defense provides an extra layer of protection against the leakage of ozone from the pipeline through the pressure transmitter.

VEGAbar 82, therefore, plays an important role in safe ozone generation, as well as in the continuous production of top-quality drinking water.

In celebration of earth day – consider ozone as a green method for water treatment

We have only one allotment of water in this world.  We will not get another.  As our water becomes contaminated we need better technologies to purify water safely.  Ozone is a green technology offering the perfect method to remove many contaminants from water.

 

In 1995, the World Bank estimated that contaminated water causes ten million people (10,000,000) to die annually and is the reason for 80% of all illnesses in developing countries; and that one billion people (1,000,000,000) have no access to clean drinking water.
Considering all the benefits and lack of drawbacks, ozone is a good choice for many water treatment applications.

 

Ozone for Water Treatment

Because of the excellent disinfection and oxidation qualities of ozone, it widely used in many water treatment applications. Each of these applications has various uses and methods for implementing and applying ozone.

 

Ozone has a wide variety of uses and applications in water treatment.  Ozone can be used as a disinfectant, decolorizer, deodorizer, detoxifier, precipitant, coagulant and for removing tastes. Consequently, the use of ozone should be considered when there is a need to address any of these water issues, and particularly when there is suspicion of water born pathogens as ozone is such an effective biocide.

Ozone is a green water treatment alternative lowering chemicals and reducing by-products and new residuals in water.  As ozone breaks back down to only oxygen there are no residual remaining in the water after ozone water treatment.  Ozone can also lower chemical requirements as ozone coagulates and precipitates many substances by itself, and is also a reasonably effective flocculant. Because of this, it can reduce other chemical requirements in treatment facilities.

Oxidation with ozone is efficient can lower chemical costs and overall energy consumption.  Ozone is the most powerful and effective broad spectrum microbiological control or disinfecting agent available. As an example, for the inactivation of Giardia cysts, the Ct (concentration & time) is about 100 times greater for free chlorine than for ozone. With viruses, the Ct is about six times greater for chlorine than for ozone. For Cryptosporidia, ozone is the number one, recommended disinfectant by the US EPA due to efficiency in inactivation.

Ozone is safer to use than alternative chemicals. , there is less need to add high concentrations of a long-lived poison to the water that may soon become drinking water. When ozone is implemented in drinking water treatment, the chlorine demand is greatly reduced, as it is then needed only as a way to provide a residual in the distribution system at low levels. This minimizes the potential for producing carcinogenic THMs, and other chlorine by-products.
Ozone may also lower overall chemical consumption due to its ability to disinfect without adding other chemicals which may later need to be removed.

 

What Can Ozone Treat In Water?

If it can be oxidized at normal temperatures and pressures, ozone can treat it.

Water treated with ozone may need to be filtered or settled, as ozone tends to coagulate and precipitate many impurities in the water.
Essentially, problems in water quality that are usually addressed with acid, peroxide, chlorine or other oxidants are probably prime candidates for ozone treatment.

Summary:

If ozone cannot be used to treat a water quality problem, it is likely that no other available oxidant will to do the job either.
The following contaminants or problems can all be potentially treated with ozone:

  • Bacteria – all known, including iron bacteria
  • Minerals – inorganics, dyes, and others
  • Metals – Iron, Manganese and many other
  • Organics – color, algae, other carbon compounds
  • Protozoans – all known, including Cryptosporidium, Giardia and all Amoebae
  • Viruses – all known
  • BOD & COD – reacts quickly, as ozone is a really active form of oxygen

 

The use of ozone in combination with UV or hydrogen peroxide creates an Advanced Oxidation Process (AOP) to create the Hydroxyl Radical (OH-).  This is an even more powerful method of oxidation than ozone alone.  There are no contaminates that can be oxidized that will not be oxidized by this process.

Click here to learn more about ozone and water treatment.

 

 

Ozonization process to clean river water

Post-Kumbh, Kshipra ozonization to continue

Indore: With an aim to keep Kshipra water clean for devotees in the holy city Ujjain, the local administration is designing a proposal to continue ozonization process at Ram ghat and Sunheri ghat.

Ozone used to clean river water

 Ujjain Municipal Corporation had signed a month long contract for ozonization with a Gurgaon based Purab Logistics firm for Rs 9 crore. During Simhastha, ozonization plants were installed at Ramghat, Mangalnath, Gaughat, Sunheri Ghat and Lalpul. Out of these plants, the administration is planning to retain the plants at two ghats which cost around Rs 95 lakh per plant.

Asheesh Singh, additional commissioner, Ujjain Municipal Corporation said, “We are planning to continue the ozonization process to keep the river water clean. The maintenance and operations will be handled by the corporation.”

 Ozone plants convert the oxygen into ozone and dissolve it in river. Consequently, the ozone destroys the impurities of bio-waste, chemicals and germs.

Better water on the way

Better water on the way with the implementation of ozone for disinfection

Read full story HERE

LIVERMORE — Prodded by long-term taste and health concerns about its Delta drinking water, the supplier for 220,000 Tri-Valley residents is adding a new water disinfectant more effective than chlorine.

Adding ozone gas — an estimated $30 million project — will produce better tasting water with lower levels of a known carcinogen, as well as several chemicals of emerging concern such as endocrine disrupters, says the Alameda County Zone 7 Water Agency.

The district is a relative latecomer to ozone. The disinfectant has been used for years or decades several Bay Area water districts, including Santa Clara Valley, Alameda County, East Bay Municipal and Contra Costa Water.

Read more about the use of ozone in drinking water HERE

Last week, Zone 7 moved to join them. Its water board approved a $2.7 million design contract to draw up plans for ozone equipment at the district’s largest treatment plant. It will take at least three years to finish the installation, officials estimated.

“Ozone will improve our water quality,” said Jill Duerig, the Zone 7 district general manager. “We think it will help a lot in dealing with taste and odor issues related to algae and other organic materials in Delta water.”

The district supplies treated wholesale water to city and local water systems in Livermore, Pleasanton, Dublin and part of San Ramon.The Sacramento-San Joaquin River Delta — where Zone 7 gets its state water supply — is full of organic material and vulnerable to algae blooms. A recent Delta algae bloom resulted in many consumer taste complaints about Tri-Valley water until the last few days.

Ozone, a highly reactive gas, seeks out and breaks up organics that can impart bad smells and odors to drinking water.

Ozone also reduces the formation of disinfection byproducts called trihalomethanes that can cause cancer. The substances form readily when chlorine is added to water.

Zone 7’s concentrations of trihalomethanes is within public health standards, with not with as great a margin to spare as the district would like, Duerig said.

“There is no one silver bullet in water treatment, but this gives an important new tool,” she said.

Zone 7 has moved slowly to embrace ozone because of the high cost and the board’s historical reluctance to borrow money instead of funding new projects on a pay-as-you go basis.

With the ozone equipment planned, however, Zone 7 is looking into selling bonds and other financing alternatives to fund long-term projects.

The ozone project could raise Zone 7’s water rates about 3 percent, Duerig said.

Angela Ramirez Holmes was the only Zone 7 board member to vote against the ozone design contract.

She said Friday she is disturbed the district committed to spend nearly $3 million to design the project without knowing how it will finance the other $27 million of the cost.

“I think we should know the whole picture before we commit to a nearly $3 million down payment,” Ramirez Holmes said.

Ozone keeps municipal water safe

Considering Flint water crisis, Tampa Bay Water ensures residents that local water exceeds safety standards.  Using high tech treatment systems, including ozone, provides high quality, safe drinking water.

Read Full Story HERE

TAMPA – In a Friday release, Tampa Bay Water ensured residents and businesses that local water supplies exceed all levels of drinking water safety standards. The company supplies water to nearly 2.4 million people in the area.

“If it doesn’t meet our high water quality standards, it doesn’t leave the plant,” said Christine Owen, Tampa Bay Water’s regulatory compliance senior manager.

The water crisis in Flint, Michigan, is due in part to unbalanced pH and alkalinity corroding the area’s pipes and fixtures. Tampa Bay Water has been controlling and treating water for appropriate and safe pH levels since 2002.

Here’s how your water becomes safe to drink: 

  • Color and contaminants are removed through a process called coagulation. Ferric sulfate, the coagulant, makes color and contaminants stick to it and settle out of the water.
  • Water is disinfected with ozone, the most powerful disinfectant in water treatment. It kills harmful micro-organisms.
  • Water is filtered to remove particles, disinfected again with chlorine, and pH and alkalinity are adjusted to make sure the water is stable and not corrosive.
  • Water samples are tested and monitored against more than 100 safety standards.

– per a Tampa Bay Water release

If you have other questions or concerns about water safety in light of the Flint crisis, feel free to contact Tampa Bay Water here , or call 866-INFO-H2O.

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

Water savings in restaurant kitchens using ozone!

Water conservation throughout the world continues to be important.  Ozone technologies can play a large role in the conservation of water, and the safe re-use of waters.  EnviroPure has found a creative way to save water in the foodservice industry.  With water bans in California and certainly coming to more states this could be very valuable and useful product.

NRA’s Kitchen Innovations Award given to EnviroPure ozone recirculation system

TRAVELERS REST, S.C. — T&S Brass and Bronze Works announced its EnviroPure ozone recirculation option has received the Kitchen Innovations Award from the National Restaurant Association (NRA), according to a press release.

The ozone recirculation option is designed to eliminate the need to add fresh water during the organic food waste disposal system’s digestive process, and instead, rely on naturally extracted water from food waste as it processes through the system, stated the release.

“A typical foodservice operation could expect to save about 400 gallons of water a day using this ozone infusion option,” said EnviroPure Systems Inc. President Jim Slanina. “At a time when we’re beginning to realize water is not an unlimited resource, we think this will be a welcome innovation.”

The EnviroPure system has received several industry awards since its acquisition by T&S in 2013, noted the release.

“We’re terrifically pleased that the NRA has recognized the uniqueness of this new ozone treatment option,” stated Slanina. “To the best of our knowledge, no other process like it exists in the market, and we’re very excited about having an impact both on saving water and keeping food waste out of landfills.”

The EnviroPure ozone recirculation option will be featured at the Kitchen Innovations Pavilion at booth 2440 during the NRA Show 2015, noted the release.