In December 2023, the ADC’s Oxidation Pond faced a critical need for aeration improvement. The pond was experiencing short-circuiting, stagnant zones, low oxygen levels, and a high risk of the pond flipping.
Aeris Global responded quickly by installing three aerdisc® directional aerators. Before installation, DO levels were critically low at 0.3 to 0.5 mg/L. Within days DO levels rose to 2 to 5 mg/L, pond circulation and health were transformed.
Following the success of the Oxidation Pond, council made the decision to replace all ten 7.8kW aerators (78kW) in the lifeless Aeration Pond, which ran 24/7 and struggled to achieve a DO above 0.1 mg/L.
After the installation of four aerdisc® aerators with a total energy of only 30kW the change was significant within days. The Dissolved Oxygen increased from 0.1 to 2.55 mg/L, complete mix conditions were restored, and short-circuiting was eliminated.
“aerdisc brought our ponds back to life. We’ve seen a major improvement in DO levels, no short-circuiting, better sludge distribution, and the removal of noxious odours – results that exceeded our expectations.”
Nathan Harvey, Projects and Compliance Engineer, Ashburton District Council
