Algae and Odour Problems in Wastewater Ponds

The Nhulunbuy Waste Stabilisation Ponds in the Northern Territory were experiencing problems with blue green algae blooms, odour, short circuiting and stratification.

After much research and testing, Northern Territory Civil & Drafting Services (NTCADS) commissioned two SolarBee solar-powered water circulators to be installed in the ponds to improve the quality of the water.  This system has proven to require zero maintenance and even survived cyclones Ingrid and Monica. The project also won the Australia & New Zealand Solar Energy Society Sustainability Award at the 2006 Northern Territory Engineering Excellence Awards.

Nhulunbuy installation: The SolarBee unit was installed in the lagoon in the background where the mixing action can be clearly seen across the surface of the water.

With the SolarBees in operation, the ponds are now able to handle an increased load due to growth in the number of mining camp residents. There is no stratification and the blue green algae and associated odour problems have been eliminated. All this was achieved without any additional power costs.

There are four sizes in the SolarBee range varying in capacity from five hectare to 18 hectare coverage. Depending on the size and underwater options fitted these upflow units can effectively draw water from depths varying from 0.6 to 30 metres. The SolarBee units are suitable for freshwater lakes, water storages and reservoirs as well as wastewater treatment ponds.

The full range of SolarBee circulators are available through EPCO Australia.

Further info