Fort Worth Adds Ozone for Drinking Water Plant

Construction on the $47 million Fort Worth Westside Water Treatment Plant began recently. It is set to have an initial treatment capacity of 12 MGD and cost $47 MM. It will treat raw water from the recently installed Tarrant Regional Water District 90-inch raw water main that connects Eagle Mountain Lake with the East Texas water supply in Cedar Creek and Richland-Chambers reservoirs. It will then distribute the treated drinking water to the Fort Worth’s West Side.

The project’s 70,000 square feet of facilities, include an operations building, wash water recovery basins, a recycle pump station, a 2.5 million gallon ground storage tank, a high-service pump station, an ozone chemical building, an electrical building and related site and civil work. This is just the latest facility to use ozone as there are already several drinking water plants in the Dallas-Fort Worth area that employ this process.

The project is expected to be completed in 2012. The contractor for the project is McCarthy Building Cos. Inc and the engineer is CDM.

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Ozone Water Use in Cosmetic Dentistry

Aesthetic dentists gather in Paris at the sixth annual European Society of Cosmetic Dentistry (ESCD) meeting October 15, 2009. Professor Edward Lynch spoke to conference on the use of ozone and ozonated water.

Prof. Lynch told the audience that the powerful disinfectant properties of ozone are useful for a range of dental procedures and ozonated water can be used in hand washing, root canal disinfection, full mouth disinfection, in ultrasonic scalers, for dental water line disinfection, during the placement of implants, for cavity disinfection and the disinfection of deep lesions to reduce the need for root canal therapy. As the only method of reliably destroying prions on dental instruments, the use of ozone may have far-reaching health benefits.

Ozone is produced using ozone generators and mixed with water. It is a widely used disinfectant for water treatment capable of inactivating a wide variety of pathogens. Its applications include public drinking water, bottled water, food processing equipment and wastewater disinfection.

Prof. Lynch described delivery systems and treatment modes, encouraging all practitioners to explore this area of dental therapeutics and inviting colleagues to contact him on e.lynch@qub.ac.uk for further information about ozone systems and for copies of scientific papers.

Spartan is a supplier of ozone water treatment systems and posts information on this blog regarding new applications for ozone. Professor Lynch’s work falls into this category.

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Bromate in Drinking Water may not be as Serious as Previously Thought

Currently, allowable levels of bromate in drinking water are 10 micrograms per liter. The US EPA and WHO are considering lowering this limit. Under certain conditions, bromate may be formed when drinking water with bromide ion content is ozonated. Technologies exist to prevent or mitigate this formation, but question have been raised as to whether bromate actually poses a human health risk.

The critical question is whether low level exposure to bromate creates a cancer risk. The Ammerican Water Works Association Research Foundation (AWWARF) decided to investigate the health impact of bromate. The research was lead by Dr. Joseph Cotruvo and Dr. Gill Gordon. It was funded by a consortium of water utilities, universities and the International Ozone Association. The project is ongoing, but preliminary results have been reported at meetings in Berlin and Tokyo.

The research looked at exposure to environmentally realistic levels of bromate and the potential for detoxification in the human body prior to the target organ of concern, the kidney. The studies showed that bromate is rapidly broken down in the body after ingestion. Bromate removal occurs in the stomach, liver and in teh blood. The dose response at low broamte doses was found to be sub linear. This implies that the previous risk studies over estimated the bromate cancer risk.

Completion of the research and modeling should show that because the previous studies did not take into account the detoxification of bromate or DNA repair, that the previous risk assessments upon which the current regulations are based over estimate the risk of cancer from low level bromate exposure in drinking water.

The research is ongoing and additional sponsors are being sought to complete the research.

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Santa Fe Region to Use Ozone for Water Treatment

The Buckman diversion project, a $216 MM to take water from the Rio Grande for the Santa Fe region, is about one year old. It was designed and is being built by CH2M Hill, a global leader in full-service engineering, consulting, construction, and operations.

The project, expected to be completed in early 2011, uses a number of treatment techniques to prepare the water for use. One of the treatment technologies employed is ozone water treatment. Other processes used include settling, granular activated carbon, centrifuges as well as chemical treatment with flocculation.

As we do regularly on this blog, we like to point out the increasing use of ozone to treat water around the US. It demonstrates that ozone is now a main stream technology for the treatment of water for public use, although many people are not aware of it extensive use.

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Key Biscayne Uses Ozone to Control Sewage Lift Station Odors

Sewage lift station can produce hydrogen sulfide odors if the sewage sits in the lift station for too long. These odors are extremely unpleasant and a source of complaints and occasional law suits from people living nearby the facilities.

Key Biscayne is one such city that has experienced this type of problem, but it is actually a common issue with these systems. In Key Biscayne’s case, one resident has sued the village for health problems related to the odors coming from the lift station.

When the Key Biscayne Sewer and Water Project began in 2007, the village hired an engineer to build the pump station, but the county’s water and sewer department operates the system. However, the county said the odors are not its problem. This summer, after receiving several complaints from neighbors, the Miami-Dade Department of Environmental Resources Management served the village with a notice of violation and asked the village to take action and solve the problem.

The installation of a filtration device and an ozone generator have helped stabilize the levels of hydrogen sulfide, which Kendra Goff of the Florida Department of Health said should remain under control. Ozone has been effectively used in a wide variety of applications, especially those where hydrogen sulfide are involved, to treat odor problems. Ozone reacts to oxidize the hydrogen sulfide to non odorous compounds. The ozone itself reverts back to oxygen. the ozone can be generated on site from air, so no chemicals need to be purchased or stored on-site.

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Fort Worth to Add Ozone Pretreatment at Westside WTP

North Central Texas is a center for ozone drinking water treatment applications because the local reservoirs have taste and odor issues during the summer months. Ozone not only effectively treats these problems but also provides disinfection credits for a wide variety of pathogens.

Fort Worth has recently begun construction of a 12 MGD facility at their Westside WTP site. The $47 MM project is being constructed by McCarthy Building Companies of Texas. The project will provide drinking water for western Fort Worth and is expanded to handle the future demand for water from that area of the region.

The plant will treat raw water from the Tarrant Regional Water Board raw water main that connects Eagle Mountain Lake with the East Texas water supply in Cedar Creek and Richland-Chambers reservoirs. The facilities include an ozone contact basin, flocculation and sedimentation basins, as well as filters and a membrane facility. The new water treatment plant will have an operations building, wash water recovery basins, a recycle pump station, a 2.5-million-gallon ground storage tank, a high-service pump station, an ozone generator building, an electrical building and related site and civil work.

This facility continues the tradition of expanding ozone use in the region. As will be noted from recent posts, ozone use continues to grow as more advanced drinking water treatment systems are deployed around the US.

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