Winter Algae Bloom Gives McKinney Texas More Reasons to Use Ozone

McKinney, TX residents noticed a metallic or earthy taste and smell to their water. The change is the result of a winter algal bloom at Lake Lavon. This is less common than a mid-summer algal bloom, which arrives in late July and into August. During a bloom, lab analysis can show high levels of geosmin and MIB, organic compounds released during the decomposition of algae that are responsible for the water’s undesirable taste and odor.

McKinney is served by the North Texas Municipal Water District (NTMWD) receives raw water supplies from: Lavon Lake, Jim Chapman Lake, Lake Texoma, Lake Tawakoni, and Lake Bonham for treatment and distribution to the region served. NTMWD is pursuing the implementation of ozonation, a process that uses ozone as a disinfectant, to meet new state and federal guidelines going into effect in 2012, and the new treatment method will also will also significantly reduce and/or eliminate taste and odor issues caused by algal blooms. Dallas, Fort Worth and Arlington have all had success with ozone for algal taste and odor issues. The organization’s current treatment process can only lessen these issues.

Ozonation is very effective for inactivating Cryptosporidium, bacteria and other naturally-occurring organisms. Ozonation also can reduce the formation of trihalomethanes (THMs), which result from the interaction of chlorine and naturally-occurring organic material in the source water. Additional benefits of this process is that it helps to alleviate taste and odor issues in treated drinking water, such as those experienced during algal blooms in Lavon Lake.

A preliminary engineering study for the utilization of ozonation as a primary disinfectant at the NTMWD Wylie Water Treatment Plants has been completed by the NTMWD staff and consulting engineer. The study provides the framework for the engineering design of ozonation facilities to be constructed at the Wylie Water Treatment Plant to meet the Texas Commission on Environmental Quality Stage 2 Disinfection Byproducts rules. A design contract has been executed with a consulting engineer, and the design has commenced. A purchase order has been issued for procurement of ozone generation equipment. The NTMWD anticipates completion of the design to allow for construction bids to be brought to the NTMWD Board of Directors for consideration in the fall of 2010. The project is estimated to cost $140-$150 million and will take several years to construct and place into operation. The current schedule includes implementation of the ozonation treatment process taking place in stages during the latter part of 2013 and early 2014.

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Springfield Missouri Looks to Up Grade Ozone Generators

Springfield Public Works (Missouri) is looking at making large-scale upgrades at sewage treatment facilities this year. The utility is seeking to replace old ozone generators and a sewer line. They have rolled out a proposal that asks the city to secure up to $13 million in special obligation bonds. Missouri DNR rated the ozone generator project the No. 1 “green project” in the state.

Ozone generators are extremely effective in disinfecting wastewater. In addition they potentially can remove pharmaceuticals and personal care products that can end up in drinking water by way of wastewater discharges. Ozone also helps to oxygenate the water before it is returned to rivers enhancing the overall health of the ecosystem.

Springfield Public Works wants to replace ozone generators at the Southwest Wastewater Treatment Plant. That would increase the facility’s capacity to disinfect from 65 million gallons a day to 100 million gallons a day. The generators are about 30 years old and replacement parts are expensive and difficult to come by. If the city had the new generators, it would likely save $4 million in operating costs in the next 20 years. Despite the increased difficulty to find parts, it is does demonstrate that high quality ozone generators can be expected to give extremely long lived operation.

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Federal Building in NYC to Harvest Rainwater with Ozone/UV Treatment

The Thursgood Marshall Federal Building in NYC will have a rain water harvesting system which will employ filtration, ozonation and UV to insure the water is safe for use in the building. While many rain water systems employ UV, the engineers for this building decided to add the extra protection of ozone.

Ozone water treatment leaves a residual of ozone in the water. By recycling the water in the tank through the ozone system, ozone disinfect both the water in the tank as well as prevents the formation of bio films on the tank walls. UV only treats the water that passes through the UV reactor. It can not prevent contamination of the storage tank or prevent secondary contamination down stream of the reactor. Combining the UV and ozone technologies provides seamless protection for the water system.

Spartan Environmental Technologies was chosen as the supplier of the ozone water treatment system. Spartan will be providing one of it’s SPARTOX ozonation systems for the application.

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