Coffs Harbour Water Reclamation Plant, Australia

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GHD played a key role in the new Coffs Harbour Water Reclamation Plant, which is capable of producing reclaimed water of a standard suitable for irrigation.

Our team completed the process, hydraulic and civil design of the plant, in partnership with the Coffs Infrastructure Alliance, which comprised the alliance partners Abigroup, John Holland and Coffs Harbour City Council.

The WRP has the capacity to treat wastewater from Coffs Harbour and the nearby township of Sawtell. It uses a Biological Nutrient Removal process comprising anaerobic zones, an oxidation ditch, secondary anoxic and aerobic zones followed by clarification. The process is design to achieve removal of carbon, nitrogen and phosphorus from the wastewater. The secondary effluent is then passed through cloth disk filters and UV disinfection before either being released to the ocean or sent on for further disinfection with chlorine, to achieve the necessary water quality to allow its use as irrigation water.

The new secondary treatment process is designed to allow the plant to treat a peak total inflow of approximately 97 ML/d. Use of the existing sewage treatment plant’s ponds provides an off-line storage capacity for approximately 10 megalitres of screened influent and a similar volume of secondary effluent.

Storage of the secondary effluent allows optimisation of the tertiary treatment process, while maximising the volume of reclaimed water that may be supplied and minimising the treated effluent release to the sensitive environment of the nearby Solitary Islands Marine Park.

Overall, the plant is delivering significant sustainability benefits to the community and the environment.

Wastewater Collection Systems

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GHD has the knowledge base and systems to tackle any wastewater transportation problem — for new systems or the upgrading of existing assets.

Having designed more than 1000 sewage pump stations and over 6000km of sewers, our industry professionals challenge conventional approaches to establish new cost-effective benchmarks.

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Wastewater Treatment

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Because all wastewaters are different, it is necessary to work with a team that can combine comprehensive knowledge with practical experience in the fields of chemistry, biology, hydraulics, mechanical processes/equipment, instrumentation and control, materials handling and plant layout.

GHD can deliver on all the process components that make up a wastewater treatment plant. We have designed and project managed more than 300 wastewater treatment plants (including major municipal facilities processing 500Ml a day and industrial projects).

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Water

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As the world’s population grows and our standards of living improve so does our need to manage the water in our environment. We need to maximise its application for human well-being and minimise impact on the environment. GHD engineers, scientists and planners can provide sustainable, cost-effective and innovative water solutions.  We assist water utilities and others who provide water services to optimise infrastructure and adapt to environmental changes in ways that balance the needs of our communities. And we enable clients to meet compliance, improve profitability and maintain their commitment to sustainability.

GHD continually expands the boundaries by engaging in research, enhancing existing systems and strategies, evaluating new procedures and transferring technology from other industries into the water industry. We work with our clients through all project stages – planning, investigation, design, delivery, operation and renewal.

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