For the first time ever, two of the most progressive technologies in water treatment are coming together in a historic event. The International Ozone Association (IOA) and International Ultraviolet Association (IUVA) are hosting the World Congress on Ozone and Ultraviolet Technologies (August 27 to 29, 2007 in Los Angeles, Calif.) to demonstrate the benefits of the synergy of ozone and ultraviolet (UV) technologies in a joint technical conference. This will be the 18th Ozone World Congress and the 4th IUVA World Congress.
Ozone is a natural, oxidizing biocide that has been used in water treatment for more than 100 years. The UV technology is a non-chemical, energy-based treatment process that inactivates bacteria, virus and parasitic organisms. These technologies, both independently and in combination, can supplant traditional chemical treatments and minimize disinfection byproducts (DBPs) while offering significant performance, product quality and operational cost benefits for municipal and industrial users.
The IOA and IUVA have found that over the years, their respective memberships have grown to hold many of the same industry leaders. According to Paul Overbeck, executive director of the IOA, the technical congress and tradeshow union have been discussed for some time.
“It’s obvious to the boards of both associations that we have members in common from the consulting, municipal, end user and academic communities,” Overbeck said. “There are synergies within the associations, certainly from within the memberships, and there are synergies in the application of the technologies.”
Dr. Rip Rice, a co-founder of both organizations, is excited to see the opportunity for members of each association to see how applicable these technologies are both in combination and in tandem. “Attendees should start thinking, ‘How can we pursue further cooperation with each other?’” Rice said.
The IOA-IUVA Congress will feature three full days of technical papers presented by members of these growing communities, including workshops and forums demonstrating the latest technology and operations of ozone and UV installations (separate and combined), their synergy and their practical benefits. According to Overbeck, more than 270 technical papers have been accepted for the congress from the abstracts submitted, requiring eight concurrent sessions and a set of poster presentations.
Topics will include:
- Ozone pretreatment to enhance the performance of UV disinfection
- Combined ozone and UV treatment of food and beverage products
- Combined ozone and UV treatment of air to remove pollutants
- Emerging water and wastewater contaminants
- Regulatory updates
- Commercial and industrial applications
The Rise of Ozone and UV
Ozone and UV technologies have been gaining momentum and broader use over the last few decades. Both technologies are increasingly being added to municipal and industrial water treatment facilities as key steps in multi-stage treatment systems. The Metropolitan Water District of Southern California (MWD) is completing a large expansion that includes the addition of ozone systems at its five drinking water treatment plants, treating more than 2.5 billion gal per day of drinking water for some 18 million people. The city of Singapore is using membrane and UV technologies to treat their reclaimed water for conservation.
Water is both a precious resource and a valuable tool. Water-intensive industries such as ethanol production spark fears of groundwater depletion, while zero-discharge industrial regulations force businesses to reconsider their water use and reuse options. The continued growth of the beverage and bottled water industries and the need to eliminate persistent foodborne and waterborne pathogens to deliver safe drinking water and foods make process sanitization and water disinfection all the more important.
Increasingly stringent environmental regulations are forcing industry leaders to adopt more efficient, environmentally safe treatment methods to protect the public from industrial contamination and the DBPs that result from chemical treatment.
Ozone and UV bring great opportunities to a wide variety of industries and applications, such as microelectronics, biotechnology, pharmaceuticals and cosmetics, agriculture and aquaculture, food processing, beverage, bottled water and laundry industries. Ozone and UV are also used in zoos, aquariums, pools, spas and air treatment.
Ozone and UV work extremely well in tandem, because ozone’s oxidation reactions facilitate better use of UV, which is a cost-effective disinfectant and creates ozone at certain wavelengths. At other frequencies, UV radiation can decompose ozone into hydroxyl radicals, part of the advance oxidation processes that is even more powerful than ozone or UV alone. Jim Bolton, executive director of the IUVA, noted that using ozone and UV together increases both the scope and effectiveness of the disinfection treatments.
“If you have ozone ahead of a UV disinfection unit, the ozone tends to clarify the water so the transmittance of UV goes up, making it work more efficiently,” Bolton said. He added that ozone will also destroy some viruses that are insensitive to UV treatment.
Ozone and UV are both on the EPA’s new list of best available technologies for meeting the stringent LT2 Enhanced Surface Water Treatment Rule. With ozone and UV, harsh chemical agents like chlorine are not necessary for primary disinfection, so fewer DBPs are created. In addition to achieving higher levels of disinfection, ozone/UV treatment provides for the destruction of many toxic pesticides and industrial chemicals that harm our environment and atmosphere. Applying these technologies in concert not only allows for treatment “teamwork,” but also increases the number of barriers to microbial contamination. The EPA’s inclusion of ozone and UV places these technologies in the mainstream for utilities to consider as part of their treatment solutions.
“With ozone and UV, you can provide a totally broad-spectrum disinfection facility that can handle any pathogen that comes through,” Bolton explained.
Rice agreed, noting the benefits of combined treatment. “Each technology now is made more cost-effective by coexisting at progressive water treatment utilities,” he said.
According to Rice, one promising innovation for ozone/UV treatment is the triggering of systemic acquired resistance (SAR) in agriculture through the sequential application of electrolyzed water, ozone and UV to growing crops—called PhytO3 Technology. The technology was originally presented at Ozone IV, a 2005 conference in Fresno, Calif. on ozone for agriculture and food. This SAR reaction activates a plant’s defenses to infections and insects, with results to be released at the IOA-IUVA World Congress. Preliminary indications are that the crops studied no longer require chemical sprays of pesticides or insecticides.
“SAR is old hat in the agriculture field, but its attainment by means of these three technologies is brand new,” Rice said, adding that the process was both cost-effective and practical. “Control of the three applications is simple—all are mounted on a single tractor.”
The nexus of the IOA and IUVA’s progressive technology and application expertise is an opportunity for professionals from both associations, as well as new industry leaders and stakeholders, to come together and learn about the latest applications and developments. By bringing top-notch solutions and driven professionals together under one roof, the IOA-IUVA World Congress lays a foundation for progressive water treatment technology for years to come. With powerful industrial partners and innovative technical leadership, the IOA and IUVA are providing a platform on which the future of water treatment can be built.