Aeration boosts USA’s largest lagoon system

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Courtesy of Aeration Industries International (AII)

The city reports, 'The entire aeration system has surpassed all our expectations.'

Problem

In 1989, a growing population prompted this northwestern USA community to expand the efficiency and capacity of its wastewater treatment facility. The original unaerated lagoon system had been built in 1967 and had worked adequately for many years. But, the system needed additional treatment capacity to meet new standards and future growth. This lagoon system is one of the largest in the nation and was located in a severe winter climate, which created additional challenges.

Solution

The AIRE-O2® aspirator aeration system was chosen as the solution. Installation of 65 x 20 hp (15 kW) aerators and three 10 hp (7.5 kW) were installed strategically throughout its seven lagoon system to optimize oxygenation and mixing. A city official reported, 'We chose it because of its success in cold weather applications and because it is a proven leader in the industry. And, its adjustable angle of operation makes it ideal for our depth lagoons.' He added that he is 'quite impressed' with Aeration Industries’ equipment. During the 10 years of operation, he reports no mechanical problems with the aerators. 'Anytime you can get that kind of service from an aeration system, you have to be very happy with them.'

Results

The municipality compares itself to a smaller community nearby that has a mechanical plant. 'They have 25 people employed while we have only 3 people here. We average about 2 man-hours a day on our system and most of that time is just for daily clean up of buildings. That’s what makes the AIRE-O2® aerators so special,' reports the official. 'We service them every 1000 hours of operation. The bottom line is that they are very low maintenance and a cost efficient system.' In 1997, the city purchased Aeration Industries’ new Triton aerator/mixer and is very pleased with them too. 'We are constantly bombarded by other aeration companies to buy their equipment and they tell us how much better their bearings are and such. But, my philosophy is, ‘If something’s not broke, don’t fix it’. The entire aeration system has surpassed all our expectations, so why would I want to look at anything else?'

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