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Nutrient Reduction at Lackawanna WWTP

Location: Throop, Pennsylvania Client: Lackawanna River Basin Sewer Authority

JMT provided facility planning, design, and construction management / inspection services for a regional sewer authority to help it meet new Nutrient Reduction Technology regulations.

The LRBSA operates three wastewater treatment plants (WWTPs), all constructed in the late 1960s. New Nutrient Reduction Technology (NRT) regulations require the plants to meet year round total nitrogen (TN) and total phosphorus (TP) limits in addition to the existing requirements specified in the Chesapeake Bay Restoration Program and the Pennsylvania Tributary Strategies. Another consideration for this client is low winter operating temperatures, often below 10°C.

Initially, JMT prepared a Facility Plan and NRT Evaluation for the three plants, including recommended improvements to the facilities over a 20-year period. JMT also conducted an evaluation of the Nutrient Trading Program and determined the feasibility and cost effectiveness of utilizing nutrient trading to meet NRT effluent goals.

Following the study and evaluation, JMT designed improvements to the Throop WWTP to help it meet certain immediate NRT requirements. The design included expansion of plant facilities from 7 MGD to 10 MGD and conversion of the existing extended aeration process to a four stage Bardenpho Process for nutrient removal. Other design features included design of four new 80 foot diameter secondary clarifiers with integral return sludge pump stations, new chemical feed facilities, new solids handling facilities, and design of a sustainable cogeneration facility to utilize digester gas to produce energy. JMT also designed a plant-wide SCADA system, making use of Flex I/O to minimize site wiring, and adding Operator Interface Terminals throughout the plant. Design of a new 2,000 square foot Headworks Building was fast-tracked and bid separately from the Main Plant Contract to allow the Authority to make use of EPA CSO Funding prior to expiration of the grant deadline.

JMT provides full-time construction inspection and management services to the client for multiple construction contracts. Significant coordination is required so that the plant maintains continuous operations. In addition to inspection services, our support includes resolving project issues, CPM schedule review and monitoring, progress payment evaluation, shop drawing approval, and change order analysis services.

 

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