Water projects

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91st Ave Treatment Plant

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The 91st 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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Ammonia Phosphorus Removal, Metropolitan Syracuse Treatment Plant Onondaga County (NY, 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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Carlsbad Desalination Plant (CA, USA)

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GHD in collaboration with Butier Engineering were selected by Poseidon Resources to provide Owner's Engineering services for the development, construction and commissioning of the 50 MGD Carlsbad Seawater Desalination project. 

As Owner’s Engineer, GHD and Butier have and continue to provide general oversight and independent assessment of the performance of the Engineering Procurement Construction (EPC) Contractor relative to the delivery of the Carlsbad project.

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Cox Creek Wastewater Treatment Upgrade (Md, USA)

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GHD was retained by Anne Arundel County for the Enhanced Nutrient Removal (ENR) Upgrade of the Cox Creek Water Reclamation Facility (WRF). The 15.0 mgd (56.7 ML/d) Cox Creek WRF is the largest of the County’s seven (7) major wastewater treatment facilities and is also the County’s largest single contributor of nitrogen and phosphorus to the Chesapeake Bay. 

During the facilities planning phase, a comprehensive examination was made of all plant unit processes and hydraulics.  As part of this project, a decision was made to expand the peak day hydraulic capacity of the facility from 30 to 45 mgd (113 to 170 ML/d) to accommodate observed I/I derived peak flows. ENR alternatives were evaluated in a two-step approach with the first step shortlisting to three alternatives and the second step selecting the final recommendation based on conceptual designs and lifecycle cost analysis. A Membrane Bioreactor (MBR) process was selected to replace the existing MLE process. MBRs proved to be the right choice for the Cox Creek WRF due to very tight site constraints, inadequate existing reactor volume to fully nitrify year-round, inadequate existing secondary clarification facilities, limited hydraulic head available for process modifications, and the County’s desire to produce as high of quality of effluent as possible with the maximum degree of reliability.

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East Pennsboro Township Wastewater Treatment Facility Improvements, East Pennsboro Township, Pennsylvania, USA

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The East Pennsboro Township Wastewater Treatment Facility in Cumberland County, Pennsylvania, originally a conventional activated sludge wastewater treatment plant permitted at 3.7 million gallons per day (MGD), was recently upgraded to a highly efficient biological nutrient removal (BNR) facility, including the addition of a combined heat and power (CHP) system utilizing biogas.

As part of Pennsylvania’s Chesapeake Bay Tributary Strategy, the plant was required by the Pennsylvania DEP to upgrade the facility to provide nutrient removal. The project also included increasing permitted capacity from 3.7 to 4.4 MGD to accommodate growth within the service area, and improvements to plant hydraulics to accommodate up to 24 MGD peak wet weather flow.

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Santa Rosa Urban Reuse

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The City of Santa Rosa’s water recycling program provides high-quality water for agriculture, energy production and urban uses. Historically, this program was managed for its wastewater disposal benefit.  GHD assisted in the development of the City’s Incremental Recycled Water Program – a 30 year master plan for managing the system. We then led a consulting team tasked with evaluating a range of alternatives for expanding Santa Rosa’s urban water recycling program by up to 6600 acre-feet per year, as one piece of the incremental program.

Because of an increasingly constrained regional water supply, the benefits of urban reuse were studied by the water utility and wastewater utility in partnership. The analysis included over a dozen alternatives for system configuration and size and concluded that a 3000 acre-foot expansion provided the best value for both utilities.

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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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