International Ozone Association meeting will be held in Toronto September 18-21. This meeting offers an informative technical program covering ozone and UV application with regard to the following subjects: disinfection and disinfection byproducts, UV validation and monitoring, advanced oxidation processes, ozone in drinking water, ozone in wastewater, and applications of ozone in food processing. Tours of the Horgan and Halton water treatment plants will also be available. There will be an exhibition of ozone and UV related equipment and instruments.
You can register for the event at www.io3a.org. Spartan Environmental Technologies hopes to see you there.
A three-year $106-million project that will replace the chlorine-treatment process with a new advanced 100 MGD plant is underway at the Lakeview Water Treatment plant in Mississauga, Ontario. The process will use a combination of ozonation, ultrafiltration (UF) and ultraviolet (UV) technology. Kenaidan Contracting is the general contractor and CH2M Hill is the consultant on the project which is the largest component of the plant’s overall $209 million Phase Two expansion.
The new process provides faster treatment time and requires less physical space. The footprint of the new plant will be only about 25 per cent of the space a conventional treatment plant would require.
By 2020, Lakeview will be a 100 per cent ozone, UF and UV treatment facility as additional phases of the project come on line. Many WTP’s are moving away from the use of chlorine towards alternatives such as ozone and UV as they try to simultaneously improve disinfection while minimizing disinfection by products.
Sucralose, the artificial sweetener in Splenda, passes right through the body, then through sewage treatment systems and out into surface and ground waters with little degradation. It is not clear if increasing amount of of sucralose released into the environment will impact the ecosystem. But research published in Environmental Engineering Science shows that the artificial sweetener is indeed making it through traditional water filtering systems. The study done at Arizona State University shows the fate of sucralose as it passes from humans into surface waters.
Samples of wastewater were taken from seven wastewater-processing plants in Arizona. Tests showed that both anaerobic and aerobic biological batch reactors showed no significant decrease in the amount of sucralose present. Chlorine, ozone, and ultraviolet light sometimes used in the final stages of wastewater treatment were also not effective at breaking down sucralose.
It might be possible to break down compounds using advanced oxidation processes. Some of these processes have been used in projects aimed at reclaiming municipal wastewater for a variety of applications, including indirect drinking water use. The hydroxyl radical formed in these processes have been shown to degrade virtually all organic compounds including chlorinated organics. On the other hand, sucralose’s resistance to degradation also keeps it from breaking down into highly toxic chlorinated compounds. So its impact on the environment may be muted.
Ashland and Hopkinton, MA are towns of about 16,000 and 14,000 residents, respectively. They are situated midway between Boston and Worcester in eastern Massachusetts. The Howe Street facility uses clarification, carbon filtration, and ozonation to treat groundwater.
Ashland experiences seasonal increases in manganese in its ground water supply. In Ashland’s water, the manganese is organically bound with an organic molecule such as humic, fulvic or tannic acid. Manganese in such a complex is more difficult to remove because the organic molecule provides a protective shell. Treatment of organically bound manganese leaves increased levels of disinfection byproducts in the finished water.
To address the issue, the Howe Street facility was originally designed to use two ozone generators to oxidize the manganese. Unfortunately, the system was difficult to operate and was taken off line for a couple of years. To bring the ozone generators back on-line, the dielectric modules were cleaned and rebuilt. A number of other improvements were made as well: relocating several valves for easier adjustment and maintenance, installing blow-down valves and drain lines for the degas system, and modifying the degassing and destruct units to vent to the entrained water separator without the need for vacuum pumps. Once the maintenance and upgrades were complete the results were dramatic and the project met the goal of having high quality water.
But by 2015, regulations that govern trihalomethanes (THMs,) when chlorine is used to disinfect drinking water, are forcing the Danvers/Middleton drinking water plant to spend $21 million to redesign the treatment process.
Once the work begins, it will take about two years to complete the expansion and renovations of the plant
The new treatment process, which has been proven in other water treatment plants such as Andover’s, will inject ozones in, purifying the water without creating THMs. Ozone reduces THM formation by replacing ozone as the primary oxidant/disinfectant. While chlorine is retained for secondary disinfection, the lower overall chlorine levels reduce the formation of chlorine based THM/other disinfection by products.
The process will require a new building on the banks of the pond to house the ozone treating equipment. The town is also building a third carbon and sand filter tank, and there will an extension on one end of the building to store the chemicals.
City Utilities of Springfield, Mo plans on capital improvements for their drinking water infrastructure. The water division plans to build a new million-gallon water tower in southeast Springfield to boost water pressure in that part of the city. In addition, it’s also moving ahead with a $7.2 million project to switch its water treatment facilities from using chlorine as a disinfectant to using ozone generators.
Ozone offers numerous benefits over chlorine as a primary disinfectant, most importantly, a reduction in the formation of chlorinated organic disinfection by products. These compounds are being more tightly regulated by the EPA in drinking water since they are suspected carcinogens.
A BCC Research technology market research report indicates that total worldwide sales revenues for ozone technology were $469 million in 2007, and are expected to increase to more than $800 Million in 2015, a compound annual growth rate (CAGR) of 8.1%. The largest ozone technology segments in 2009 were water/wastewater applications. These will increase from $356 million in 2007 to nearly $600 million in 2015, a compound annual growth rate (CAGR) of 8.4%. Sales of ozone technology in Air and gas treatment, medicine will experience moderate growth. This market segment was worth $113 million in 2007 and will increase at a 6.9% compound annual growth rate (CAGR) to reach a value of $183 million in 2015.
The Windsor Utilities Commission and the City of Windsor won the Award for Best Tasting Water at the Ontario Works Association’s annual water testing competition. Windsor was the first municipality in Ontario to utilize Ozone for primary disinfection. Many other water treatment plants using ozone have won tasting events, not just against other water plants but also versus bottled water. These victories demonstrate that ozone can solve taste and odor problems associated with most water sources.