Water Treatment and Desalination

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Sustainable water treatment solutions that deliver safe & palatable water are an essential service for human wellbeing and a healthy community.

All untreated water sources have unique water quality characteristics. So we’ve assembled a team with extensive practical experience in water treatment covering chemistry, biology, hydraulics, process selection, control, residuals handling and plant layout.

Our track record includes plant capacities of 0.1 MLD to over 2500 MLD. We’ve dedicated our efforts to more than 300 treatment plants over the past 60 years. Our services include design of water treatment process solutions as diverse as Dissolved Air Floatation Filtration (DAFF), Ozone/Biological Filtration and Desalination (using Reverse Osmosis or Electrodialysis Reversal).

Services:

  • Water quality risk assessment & HACCP plans
  • Treatment facilities planning and options assessment
  • Life cycle assessment
  • Treatability studies & pilot plant work
  • Treatment process selection & concept design
  • Detail design for bid/tender
  • Design Build owner’s engineering services
  • Design Build & alliance partnerships
  • Construction & commissioning management
    Automation/SCADA design & implementation
  • Operation & Maintenance manuals
    Residuals processing design
  • Catchment & distribution water quality modelling
  • Research & development of new treatment ideas, risk quantification and minimum energy solutions
  • Permitting and regulatory assistance

For further information, contact:

Calvin Lai
Service Line Leader, Water Treatment & Desalination – Australia, Chile, New Zealand, Asia Pacific, Europe and the Middle East
T: +61 2 9239 7274
E: Calvin Lai


Kevin Castro
Service Line Leader, Water Treatment & Desalination – North America
T: +1 315 679 5785
E: Kevin Castro

Ammonia Phosphorus Removal, Metropolitan Syracuse Treatment Plant Onondaga County, New York USA

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In partnership with two other firms GHD was retained by Onondaga County, New York to provide engineering services in connection with the design and construction of improvements to its 84 million-gallon-per day Metropolitan (METRO) wastewater treatment plant, with the objective of upgrading the level of wastewater treatment provided for ammonia and phosphorus removal.

The project established that the facility, which provided conventional secondary treatment (with seasonal nitrification and phosphorus removal to less than 1.0 mg/L), needed to be upgraded to provide year-round ammonia removal (1.0 mg/L as N for June 1st to October 31st, and 2.0 mg/L for November 1st to May 31st), and phosphorus removal to 0.12 mg/L TP for a 12-month rolling average.

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Clear Harbour Alliance

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With the growth of Auckland City, the combined stormwater/wastewater system was exceeding capacity during rainfall events, resulting in pollution of the Waitemata Harbour. A conventional project model could not guarantee the level of service that Metrowater wanted for their customers during the separation process so they decided on an Alliance model – one that was strongly customer focussed. The project goal of cleaning up Auckland’s harbour was a philosophy of shared ownership and responsibility reflected in the principle – "it's ours".

Metrowater is Auckland City's water and wastewater utility and was established by Auckland City Council to provide water and wastewater services to over 142,000 homes and businesses, reaching 420,000 people across Auckland City.  The area of operation covers 153 square kilometres with a water and wastewater network of more than 3,600 km of pipes. Metrowater’s expectation is that their customers receive the highest quality, reliable water supply possible and that Auckland City’s wastewater networks are managed in a cost effective, environmentally sound and sustainable manner.

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Delaware Aqueduct Tap Membrane Filtration Plant

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The Town of Newburgh owns and operates two sources of drinking water supply to serve its approximately 23,000 customers in its Consolidated Water District, as well as the Town of Marlborough. The two sources are the Delaware Aqueduct Tap (DAT), which is a connection to the New York City Delaware Aqueduct and the Chadwick Lake Reservoir, which is a manmade reservoir in the Town.

Until recently, the Town had been granted a filtration waiver from the Surface Water Treatment Rule by the New York State Department of Health (NYSDOH) for its Delaware Aqueduct supply. Due to recent increases in disinfection byproducts, specifically haloacetic acids, the Town exceeded the maximum contaminant level under the Stage 1 Disinfection Byproduct Rule. Accordingly, the NYSDOH rescinded the filtration waiver. The Town retained GHD to evaluate filtration alternatives for the DAT and to prepare the design of the required facilities.

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Dong Tam water supply project

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A private investment was made to build a reservoir, water treatment plant with capacity of 90,000m3/day, a 45km transmission pipeline system with diameter of 800-900mm from Dong Tam to Go Cong town, and a booster pumping station in the Mekong Delta province of Tien Giang, Vietnam. GHD Vietnam was appointed to provide technical assistance, project management and supervision for the project.

The project aimed at supplying fresh water for about 590,000 inhabitants in Go Cong town and two local districts Go Cong Dong and Go Cong Tay as well as Cho Gao town and a few industrial parks in Cho Gao as a supplementary water supply. The project commenced in December 2008 under the Build Own Operate (BOO) form. Tien Giang People’s Committee and Tien Giang Water Supply and Sewerage Company will be responsible for the distribution of water and invest on construction of secondary pipe network.

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Hamilton Water Treatment Plant (New Zealand)

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The Hamilton City Council in New Zealand wanted a world-class Water Treatment Station that met the city's water needs and exceeded or met New Zealand Drinking Water Standards at the lowest whole-of-life cost.

The original Hamilton Water Treatment Station (WTS) was a conventional clarification and filtration plant with a nominal capacity of 80 ML/d. The WTS drew water from the Waikato River and, in recent years, the water has shown increasing levels of unpleasant taste and odour as river algal levels increased. Cyanotoxins levels above detectable levels have also been found.

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Octoraro Water Treatment Plant Improvements, Little Britain Township, Lancaster County, Pennsylvania, USA

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The Octoraro Water Treatment Plant (WTP) pretreatment project was recognized with a Diamond Award Certificate for Engineering Excellence from the American Council of Engineering Companies of Pennsylvania.

Located in Lancaster County, Pennsylvania, the Chester Water Authority’s 60 mgd Octoraro WTP is a conventional surface water filtration plant. The plant treats water from the Octoraro Reservoir and/or raw water from the reservoir supplemented with raw water pumped from the Susquehanna River.

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Water Treatment Plant Improvements, Onondaga County Water Authority

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Onondaga County Water Authority in Syracuse, New York, USA, retained GHD to provide the basis of design, final design and construction services for the ±$15 million capital improvement program to the Otisco Lake Water Treatment Plant (WTP). The project was funded through the Drinking Water State Revolving Loan Program.

In addition to the expansion and replacement of the filters and several chemical and process enhancements, the project included various performance maintenance upgrades to improve the reliability and performance of building systems and process equipment. Filter run times were greatly improved and finished water quality continues to meet Partnership for Safe Water goals. Backwash process review and optimization resulted in a 30% reduction in annual backwash water usage.

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Smith River Highway 199 diesel spill clean up

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In 2008, an accident involving a diesel truck released 4000 gallons of red-dyed diesel fuel into an inboard ditch along Highway 199 in Del Norte County, CA. Diesel fuel soaked the ground through the road prism and into the gravel bar adjacent to Smith River, a federally-designated wild and scenic river. GHD was selected to lead the emergency response, including efforts to contain the spilled diesel and prevent impacts to the Smith River.

This project was challenging due to the steep forested slopes, the urgency of cleanup and the magnitude of the spill. Our team worked with nine contractors and 12 public regulatory agencies in a showcase of collaborative effort between stakeholders toward a common goal. The remediation strategy negotiated with stakeholders was a combination of source removal, flushing of the road fill, and recovery and treatment of the water used for flushing. Only 117 days after the spill occurred, regulatory agencies concurred that necessary remediation and restoration were satisfactorily complete.

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Sydney Desalination Project

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In early 2005, GHD, and its partner Fichtner, were engaged by Sydney Water to undertake a feasibility study to determine if desalination was practical as an alternative water source that would complement Sydney’s existing water sources. The feasibility study, undertaken together with Sydney Water, in an integrated project team set the foundation for this milestone project.

The project comprised three main components, a 250ML/day capacity reverse osmosis desalination plant, the intake and outlet tunnels and associated marine works, and the delivery pump station and 18km long transfer pipeline across Botany Bay to the centre of the city. In a world first cement lined steel pipes of this size had never before been laid simultaneously in a string and placed in an underwater trench.

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Water & Wastewater Operations – Arizona Department of Corrections

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Since July 2006, GHD's Environmental Services group has been responsible for operating and maintaining advanced water and wastewater facilities for the Arizona Department of Corrections at Lewis, Yuma, and Winslow-Apache Prison Complexes.   

We are directly responsible for all activities, performance, and regulatory compliance. Our services include 7 days per week on-site operation of all facilities and systems, water and wastewater sampling and analyses, maintenance and repair of equipment, and management of biosolids, electrical, and other subcontractors. Working closely with prison facilities staff, we also provide support to the prisons such as operations and maintenance planning and budgeting, engineering support, oversight of upgrades and modifications, and utilization of inmates in operation and maintenance of the facilities.

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Water Treatment Plant Improvements, Binghamton, New York USA

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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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Calvin Lai

Calvain Lai

Calvin has more than 20 years’ experience in drinking water supply and assessment/design of water treatment plants. His experience covers all areas of water treatment including coagulation, clarification, filtration, membrane processes, ozonation, granular and powdered activated carbon, chemical feed systems and disinfection.

With an in-depth understanding of the water quality management framework as described by the Australian Drinking Water Guidelines, Calvin is frequently called upon to help assess the effectiveness of the critical control points in a water treatment plant. Most recently, he was Design Manager for the delivery of the 180 ML/d Wyaralong Water Treatment Plant for Seqwater.

Service Line Leader, Water Quality & Treatment – Australia, Chile, New Zealand, Asia Pacific, Europe and the Middle East
T:
+61 2 9239 7274
E: Calvin Lai

Kevin Castro

Kevin Castro

Kevin has over 22 years of extensive experience in all areas of waterworks engineering. His expertise includes planning, study, design, and construction management of water supply, treatment, distribution, pumping, and storage facilities.

Service Line Leader, Water Quality & Treatment – North America
T:
+1 315 679 5785
E: Kevin Castro

New Zealand

Christian Gamst

Christian Gamst

Christian is a Design Engineer in GHD’s Auckland office and has 7 years’ experience in the design and project management of water, wastewater, stormwater, and water treatment plant projects.

Christian took part in the Project New Grad development programme involving Auckland Council (previously North Shore City Council), Fulton Hogan and GHD internships over the period 2010 to 2013.

This depth of experience between local government, contractor and consultancy has given Christian a keen insight into engineering projects from each participant’s perspective; allowing him to come up with innovative solutions and designs that fully meet clients expectations, while ensuring designs remain sensible and constructible for contractors.

Service Line Coordinator, Water Treatment & Desalination – New Zealand
T:
+64 9 370 8386
E: Christian Gamst

Philippines

Aileen Huelgas

Aileen Huelgas

Aileen obtained her PhD in Environmental Engineering in Hokkaido University, Japan and was a member of the faculty of Chemical Engineering at De La Salle University before joining GHD. Her specialist area of research is the use of MBR for the treatment of greywater using micro-filter and ultra-filter membranes. She has published widely in her field of study.

Chemical Engineer
T:
+63 2 479 5753
E: Aileen Huelgas