RMA QA Aerator and Mixer Unit Moree Shire Council
RMA QA 30 model aerator and mixer unit was installed by Council staff in a tertiary pond at the Moree Sewage Treatment Plant. This complex of four tertiary ponds covers some 57,000 square metres in total, and the aerator was located toward the head of the first and smallest tertiary pond. Positioning was close to and slightly upstream of the inlet from the plant. Our recommendation to the Council was to install 2 x RMA QA 30 aerator/mixers as this pond measures approx. 100 x 140 metres, 1.0-1.5m deep, and feeds into the three much larger ponds.
However, due to budget constraints and other priorities only one aerator has been installed. There was a strong odour coming from this pond and it was not possible to see below the water surface. The photo of the mooring line taken 20 days after installation, shows a change in water colour and the line can easily be seen passing under the water surface.
At inspection there was no odour present, and it was evident that nature was beginning to come back as there were many insects and dragonflies. We could also see that there were small fish and some larger carp, starting to come into this pond seeking the source of micro bubbles.
Ongoing testing has shown a result of BOD<2 and Total Nitrogen figures of 1.17, which shows excellent progress. Since then the STP suffered a breakdown which did release sewage into the ponds and caused a spike in the results, which is now reducing.
This Council has since ordered an additional RMA QA 30 aerator due to the success of the first purchase.