Wayne Lem, Global Market Manager for Municipal Wastewater at TrojanUV, explains the growing trend toward UV disinfection including the advantages for large-scale treatment plants and stormwater treatment.
The following is an excerpt from a Q&A with Water Online Radio. Click on the Radio Player above to hear the full interview.
Water Online Radio: UV disinfection seems to be an exploding market, which is good for TrojanUV. What's underneath that?
Wayne: There are many aspects to this. The first is regulatory requirements. We've seen regulatory requirements become more stringent over the last few years. This primarily has to do with wastewater discharge regulations becoming tighter, which has been done to protect public health. Secondly, we also see regulations for chlorine residuals. Chlorine is harmful and toxic to the environment, so placing limits on it works to protect the environment. With UV disinfection, there are no chemicals involved.
It’s also a safety concern when you talk about chlorine these days. With Homeland Security matters in our country, chlorine facilities could potentially be at risk.
UV is a very sustainable solution. It works to reduce our carbon footprint because it doesn’t involve trucking and hauling chemicals back and forth to plants.
When you look at today's municipalities -- many of which have tight budgets -- UV has the lowest total cost of ownership versus chemicals. These are some of the reasons we are seeing a shift towards UV disinfection.
Water Online Radio: My sense is that early on, UV was more popular in the smaller markets, but it seems to have been adopted quickly by the larger markets. Why is that happening, and what have you guys done to become a leader for this trend?
Wayne: Early on, UV was ideal for small and medium-size wastewater treatment plants. At Trojan, we go to the customer and find out what their unmet needs are. We do this by talking to operators, municipalities, consulting engineers, and regulators.
We found there is a need for large UV systems, which makes it cost-effective for large plants. We developed the TrojanUVSigna™, which is a UV system designed for large-scale disinfection applications.
Basically, this system incorporates our latest innovations, including our new solo lamp technology. The goal of this is to reduce the total cost of ownership to the municipality, and drastically simplify operation and maintenance for the plant.
Combined with that is our solo lamp technology. In the past, municipalities had a choice between a low-pressure UV lamp, which offers high electrical-efficiency and a long life, or a medium pressure lamp, which had a high UV output but also a very high energy cost.
The solo lamp combines the best of both, and makes maintenance and operation easier. That's important to larger plants with higher flows. You don't want a system where you have to maintain all those lamps.
Water Online Radio: I understand that Trojan UV is also doing quite a bit of work to help municipalities treat storm water.
Wayne: Just to give a little background on stormwater, during a very heavy rainfall, there are combined sewer overflow systems. When this heavy rainfall happens, untreated sewage or stormwater is released into the receiving waters, which can be harmful to public health.
In the past, chlorine was an option, but it's not the only option. UV now treats an estimated one billion gallons of stormwater. This includes low-quality wastewater around the world each day.
At Trojan we've developed four products that are geared towards stormwater treatment. One of our installations is used in the community of East Bayfront in Toronto. There is a park where stormwater is treated and used for the park. It's the first of its kind in the world. It’s very unique because they actually treat the stormwater and also use it as a piece of art in terms of waterfalls through the park…
Click on the Radio Player above to hear the full interview.