In 2017 Central Otago District Council upgraded their Cromwell oxidation ponds. This included installation of fifteen aerators. Over the years these proved ineffective and resulted in low dissolved oxygen being recorded in the ponds almost all year round. The equipment had extremely low oxygen transfer efficiency and exceptionally high-power consumption. It also proved unreliable, expensive … Continue reading aerdisc® transforms Cromwell WWTP for Central Otago DC with 68% less energy!