This pioneering project marks the beginning to an offsite construction solution for the upgrade of Wastewater Treatment Plants. A cheaper, faster, high-quality, and safe solution with a methodology that can be repeated in New Zealand towns.

This project followed Clutha District Council’s (CDC) need to upgrade its wastewater treatment pond at Heriot in the South Island’s Western Otago. The pond needed to meet the new effluent discharge quality requirements. The CDC wanted a cost-effective solution, using technology that would deliver a whole-of-life¹ cost.
Marshall Industries was the chosen construction contractor for the project. Their proposal combined a range of innovative and cost-effective solutions that included a completely prefabricated ready-to-operate Microfiltration (MF) plant. The volumetric nature of the bio-shells and the MF solution also provided flexibility for future upgrades.

¹ Whole-of-life cost refers to the total cost of ownership over the life of the asset.

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