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Gladstone Water Treatment Plant Process Gladstone Water Treatment Plant Process

 

1.

 

 

Raw Water contains suspended matter and colour. To remove this turbidity and colour, a coagulant (aluminium sulphate) is injected into the raw water and thoroughly mixed in the Flash Mix Tank.

2.

 

 

Aluminium sulphate (Alum) loaded water then passes into the clarifiers. If raw warter is clean, it by passes the clarifiers and is sent directly to the detention chamber.

3.

 

 

The Alum reacts with the natural alkalinity of the water forming a 'floc'. Being heavier than the water, the floc settles to the bottom taking with it suspended matter and colour. This forms a sludge.

4.

 

 

Poly electrolyte is added after the flash mix as an aid to the flocculation process, as well as a filter aid prior to filtration. 

5.

 

 

The clear water leaving the clarifier still contains small amounts of floc. This is removed by passing the water through sand filters. The filters are periodically backwashed to remove the floc, which is sent to the settling tank.

6.

 

 

The filtered water then passes through an observation chamber where clarity can be checked.

7.

 

 

 

Chlorine is then added to disinfect the water, which may contain micro-organisms and bacteria, making the water safe for human consumption. Water is then collected in the clear water reservoir to be pumped to the community reservoirs from where it is reticulated to consumers.

8.

 

 

 

Chlorine is then added to disinfect the water, which may contain micro-organisms and bacteria, making the water safe for human consumption. Water is then collected in the clear water reservoir to be pumped to the community reservoirs from where it is reticulated to consumers.

9.

 

 

 

Sludge is collected in the clarifier (settling tank). Sludge is sent to the sewerage plant and recovered water is drained to the recovered water reservoir, and pumped to the raw water reservoir.