Easton Wastewater Treatment Facility, USA

GHD has helped the town of Easton in Maryland, USA, implement the first Enhanced Nutrient Removal Wastewater Treatment facility funded by the Chesapeake Bay Restoration program.

The plant was designed to meet new National Pollutant Discharge Elimination System limits of 4.0 mg/l Total Nitrogen (TN) and 0.3 mg/l Total Phosphorus (TP) on an annual average basis. It serves the Town of Easton and is designed to treat an average daily flow of 4.0 mgd, expandable in the future to 6.0 mgd.

The unit processes for the liquid train of the new facility include influent flow measurement and flow equalisation, step-type fine screens and vortex grit removal, two 5-stage Bardenpho oxidation ditch bioreactors, supplemental carbon feed system, two secondary clarifiers, deep bed continuously-backwashed up-flow denitrification filters, coagulant feed system, ultraviolet disinfection, and fine bubble diffusion for post aeration. The new unit processes associated with the solids train include: aerated waste sludge holding tanks, centrifuge dewatering, indirect drying, pneumatic dried product conveying and a silo for Class A dried biosolids product storage.

Electrical upgrades included a medium voltage loop-feed electrical power distribution system with a second utility feeder and low voltage power distribution within the plant. Instrumentation and controls include a distributed control system with Wonderware supervisory control and data acquisition (SCADA) software, TCP/IP MDBUS Ethernet network, MDBUS field devices and a fiber-optic data ring. GHD performed all of the programming for the plant-wide process control and SCADA system.

The plant is benefiting the local community with a system that is designed for maximum automation and one that eliminates hazardous chlorine gas and minimises nutrient release into Chesapeake Bay. 100 percent of the Class A dried product is sold to local agriculture for land application to crops.

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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