Initial monitoring revealed strong vertical stratification in the quarry. While surface water remained oxygen-rich, dissolved oxygen (DO) levels at the base dropped below 30%, creating the potential for stagnation, odour, and chemical instability.
The task: Ensure uniform DO levels throughout the water column to safeguard the recycled water before distribution.
WEARS provided the ResMix 3000, a floating axial-flow mixer designed for energy-efficient, high-volume circulation. Once deployed, the system operated continuously to promote full-depth mixing and destratification, with performance confirmed through regular field sampling.
Performance was tracked across three stages:
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Before operation : Strong stratification, with DO falling sharply from 100% at the surface to below 30% at 40 m.
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After 5 days of operation: Significant improvement at mid-depths (~60% DO), deeper zones beginning to respond.
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After 5 weeks of operation: Consistent DO levels of 80–85% from 5 m to 45 m — stratification fully eliminated.
This progression demonstrated clear, repeatable improvement in water quality over time.
ResMix 3000 performance at Moodlu Quarry: Dissolved oxygen (% saturation) stabilised from surface to 45 m depth after just 5 weeks of continuous operation.
Project Outcomes
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Improved water quality for growers supplied by the Wamuran Irrigation Scheme
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Enhanced oxygenation across a deep reservoir, minimising risk of odour or stratification
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Low operational energy use, with minimal maintenance required
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Support for Unitywater’s long-term sustainability targets
Transforming a disused Quarry into a High-Performance Asset
Moodlu Quarry now plays a critical role in delivering fit-for-purpose recycled water to agriculture, showing how existing infrastructure can be repurposed for environmental and economic benefit. The ResMix 3000 continues to support Unitywater in delivering water security through smart, low-impact technology.
