McConnell Dowell, in joint venture, delivered an additional Biological Nutrient Removal (BNR) facility for Watercare as part of its expansion of processing facilities at Māngere Resource Recovery Facility (MRRF). The scope of work involved the construction of two reactors, two clarifiers, a blower building, splitter boxes (including for future duplication of reactors in 10 years), secondary effluent (SEF) pipeline, sludge storage tanks and interconnecting SEF pipework to provide additional secondary treatment capacity of approximately 250,000 people. We successfully installed the twin SEF pipes using a pipejacking method, which required precision in execution due to a gas main, 33 kV cable, and the main fuel main from the Marsden Point Refinery to Auckland and the airport running along the alignment. Māngere WWTP BNR Upgrade Auckland, New Zealand
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