Wastewater Treatment & Recycling

The 91^st Avenue WWTP Chlorination Improvements project involved the replacement of a 120-ton bulk chlorine system with a system consisting of 32 one-ton chlorine cylinders.  The plant has a treatment capacity exceeding 180 mgd. The existing chlorination equipment and piping was replaced while the plant was in full and normal operating condition. The plant’s treated effluent is used at the Tres Rios Wetlands and as cooling water for the Palo Verde Nuclear Generating Station.

The project also involved the development and coordination of the Maintenance of Plant Operation (MOPO) procedures. The chlorination of the plant effluent had to be maintained at all times during construction. The project also included building structural, electrical, and HVAC modifications. The equipment installed included the following:

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Since August 2005, GHD has been responsible for operating and maintaining water and wastewater facilities for Arizona Department of Transportation facilities (rest areas, maintenance camps, ports of entry and MVD offices) statewide. Considered collectively, and when all sites are fully operational, the ADOT facilities comprise the fourth largest water system in the State of Arizona, serving 27,000 customers per day and over 10,000,000 customers annually. In the course of our work for ADOT, GHD is analyzing and implementing water and wastewater solutions on a daily basis.

ADOT maintains approximately 130 water and wastewater facilities statewide at rest areas, maintenance camps and ports of entry, including 25 ADEQ-regulated facilities. Since August 1, 2005, GHD has been the contractor responsible for monitoring operations and maintenance of all these facilities.  We believe that our O&M territory, which encompasses the entire State of Arizona, is the largest of its kind in the US.

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Biodiesel Producers Ltd engaged GHD to prepare a concept and detailed design for a wastewater treatment plant. The plant will treat wastewater from the biodiesel plant and adjacent rendering plant, at a new tallow based biodiesel production facility located at Barnawartha near Wodonga, Victoria.

The wastewater treatment plant is based on a covered anaerobic lagoon and activated sludge plant (sequencing batch reactor). 

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GHD was commissioned to design a new Biological Nutrient Removal (BNR) and membrane treatment system for the Cleveland Bay Wastewater Treatment Facility, with a capacity to cater for an estimated population of 126,000 people.

State-of-the-art biological processes were introduced, by combining an oxidation ditch (to achieve a high level of nutrient removal) with membrane solids separation, to achieve a very high effluent quality. This approach retains the simplicity and flexibility of the oxidation ditch while adding the exceptional solids separation capability of the membranes.

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GHD's ongoing research and investigation into the application of dry composting toilets and separate collection and use of urine provides for a fundamentally different approach to sanitation.

Benefits of dry composting toilet and urine separating technology

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Cox Creek Water Reclamation Facility, Anne Arundel County, Maryland

The 15 million gallons per day Cox Creek Water Reclamation Facility (WRF) is the largest wastewater treatment facility in Anne Arundel County and is also the County’s largest single contributor of nitrogen to Chesapeake Bay. The County targeted the enhanced nutrient removal (ENR) upgrade of the Cox Creek WRF as the first step in a plan to upgrade all of their wastewater treatment facilities for ENR.

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GHD is playing a leading role in Dubai’s current and future water requirements.

Our team in the Middle East has completed preliminary engineering work on the Jebel Ali Free Zone (JAFZA) Utility project to provide water infrastructure to an area of 8500ha that includes the JAFZA Free Trade Zone, Technopark and downtown Jebel Ali. These precincts comprise both greenfield and existing development with industrial, commercial and residential land uses.

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Perth’s next big waste water treatment plant is being designed to accommodate a potential population of 800,000 people.

GHD has been engaged by the Water Corporation in Western Australia to design the Alkimos Waste Water Treatment Plant. GHD was chosen on the basis of its concept design and joins the Alkimos Water Alliance (AWA) to deliver this AUD$80 million project. AWA comprises Multiplex, McMahon and Zublin.

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GHD designed this 150,000 gallon per day treatment plant using a sequencing batch reactor (SBR)-activated sludge process, which included nitrification-denitrification to achieve a class A⁺ finished effluent.

Elements of design included influent flow metering, a fully enclosed duplex pump station, fine screens, first and second stage aeration for nitrification and denitrification, clarification, and aerobic digestion.  Sludge handling was accomplished through centrifuge dewatering.  Odor and noise abatement was incorporated through the total enclosure of headworks screens, aeration and clarification elements, sludge processing, air blowers, and electrical system inside a building.  The design included a bulk liquid sodium hypochlorite disinfection system for the final stage of treatment.  Finished effluent is used to irrigate golf turf.

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Sydney Water in partnership with Sydney Water Corporation, John Holland, Thompson Controls, and GHD delivered the $60 million Rouse Hill Recycled Water Plant – stage two amplification project. This is the Southern Hemisphere’s largest residential water recycling scheme.

Initiated in September 2006, the project doubled the capacity of the existing waste water treatment plant to 27 million litres a day and increased the recycled water capacity to 4.7 billion litres a year (this will supply 36,000 homes in the local community at project completion).

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Following the amalgamation of eight local government boundaries, GHD was commissioned to develop a high-level strategy for the Toowoomba Regional Council for the planning of wastewater treatment plants and effluent reuse.

The study included a review of previous planning studies completed by the former local authorities, a population review and a look at loadings. A brief assessment of the status of the area’s existing sewage treatment plants was undertaken to determine their capacity and if they should remain as a stand-alone system or be integrated with other systems.

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GHD provided evaluation, design and construction services for comprehensive improvements to the City of Binghamton’s water filtration facilities and Water and Sewer Department offices.

The facility is a 20 million gallons a day (76Ml/d) conventional filtration plant, including: a raw water pumping station and intake on the Susquehanna River; chemical feed building housing alum, chlorine dioxide, sodium chlorite, powder-activated carbon, acid, caustic and polymer; four flocculation/sedimentation basins; and 10 rapid sand filters, chlorination, corrosion control and fluoridation.

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