Grahamstown TP

Grahamstown water is treated by a conventional filtration process. The plant has a peak supply capacity of 265 megalitres per day and is Hunter Water’s largest water treatment plant.

Coagulation is achieved by the addition of alum and poly-electrolyte, followed by sedimentation, then filtration, followed by the addition of lime, chlorine and fluoride (refer to figure below).

A powdered activated carbon dosing plant has also been constructed at Grahamstown Dam, which serves two main purposes. It:

• removes objectionable taste compounds that may be present in the water
• assists in removing blue-green algal toxins, if the need ever arises.

Figure 1 Grahamstown Water Treatment Plant Process Flow Diagram