Removal of DOC and DBP Precursors from a Surface Water Supply

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Courtesy of IXOM Watercare

Background:

The 2.5 MLD Airey’s Inlet Water Treatment Plant is conventional alum coagulation, sludge blanket clarification, filtration WTP. It sources raw water from the 514 ML Painkalac Dam situated in the Angahook State Park This raw water is soft and high in colour and dissolved organic carbon (DOC). After heavy rainfalls, colour and DOC content are known to further increase along with a spike in turbidity. In response to these events, the plant operators are required to increase alum dosage to >80 mg/Land use an alkali to control pH.  Due to the high alum loading and intermittent plant operation, the existing clarifier and sand filter often require increased operator intervention to ensure good performance. The current treatment is unable to remove >60% DOC, with the average residual DOC level of 6-8 mg/L. While the current treatment at Airey’s Inlet WTP continuously produces water, that meets the Australian
Drinking Water Quality parameters. Barwon Water is investigating suitable processes to further improve the performance with minimum operator intervention. In May/June 2001 a trial at the Airey’s Inlet WTP was conducted by Orica Advanced Water Technologies (AWT) and Barwon Water to compare efficiencies of the existing treatment process with that obtained by a MIEX® pilot plant. To simulate full MIEX®/Alum treatment, water from the MIEX® pilot plant was alum treated in jar tests. This was then compared to jar tests simulating the existing treatment process.

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