AWWA ACE56317

AWWA ACE56317 Design, Construction, Commissioning and Operation of the World's First Large Scale Miex(R) Water Treatment Plant
Conference Proceeding by American Water Works Association, 06/16/2002

Smith, Paul; Botica, Chris; Long, Bruce; Allender, Bruce

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The Water Corporation of Western Australia has over a number of years beeninvestigating various water treatment technologies aimed at dissolved organic carbon(DOC) removal. Research was prompted by intermittent outbreaks of Dimethyl Trisulphide(DMTS) in the clearwater distribution system. With elevated levels of DOC linked to theformation of DMTS, the MIEX(R) Process was trialed at Wanneroo Groundwater TreatmentPlant (GWTP), a currently used source of DMTS affected water.In 2000, after two years of pilot plant and laboratory work, the Water Corporation ofWestern Australia initiated the design and construction of the world's first large scaleMIEX(R) plant.The general layout of the Wanneroo MIEX(R) plant consists of two mixed contactor tanksfeeding 6 hopper bottomed settlers. The regeneration facility uses two regenerationvessels with one regenerant tank. Two salt saturating systems are used to prepare anddeliver the brine solution for the regenerant tank. Hydrochloric acid and sodiumhydroxide dosing facilities are provided for regenerant preparation. The hydraulics of theexisting Wanneroo plant dictated that a low lift Pump Station be used, to lift the treatedwater for gravity flow into the existing clarifiers.The MIEX(R) plant was constructed on the existing Wanneroo GWTP site as a retrofit.Located at the head of the works after the aerator, the plant treats raw water prior to alumcoagulation, clarification and filtration in the existing plant.The main driver for DOC removal is the control of DMTS outbreaks. Another benefit is thereduction in chlorine demand during water treatment, and resulting in chlorine residualsextending further into the water distribution network, without supplementary chlorinedosing. A lower overall chlorine dose is therefore required to achieve the desired chlorineresidual. The reduced DOC and chlorine levels also contribute to lower levels of disinfectionbyproducts. Includes 6 references, tables, figures.