Aratula and Helidon Sewage Treatment Plants The Aratula and Helidon Sewage Treatment Plants (STPs) using free water surface wetlands will ensure licence compliance to cater for a predicted increase in future effluent flows. www.trility.com.au Queensland Urban Utilities commissioned TRILITY and our major subcontractor, Water and Carbon Group, to Design and Construct (D&C) treatment plant upgrades at Aratula STP (50km south of Ipswich, Qu

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