The activated sludge is made up of micro-organisms containing bacteria, which are a natural part of wastewater used to break down the organic solids in water. There are 16 Aeration Tanks with a total volume of 53,000 m 3 . Eight of these tanks are rectangular employing a conventional activated sludge process. Six of these are equipped with ceramic fine air bubble dome diffusers, and the other two have mechanical aerators. Another eight tanks are circular, 10.7 m deep, and employ a complete-mix activated sludge process, using ceramic fine air bubble dome diffusers.
Final effluent overflows from the tanks through overflow weirs located at the tank s peripheries.
The conduit is also equipped with numerous diffusers to provide for the required dilution. Thickened waste activated sludge is then mixed with raw sludge, dewatered and incinerated. The plant does not presently utilize this flotation process. High concentrations of phosphorus in the final effluent may promote the growth of excessive algae and aquatic plants in the receiving waters. This would deteriorate the lake's water quality, in a process known as eutrophication.