Meeting Process Planning Challenges: Advanced Wastewater Treatment for New York City
Client: New York City Department of Environmental Protection
Location: New York, NY
The NYC Department of Environmental Protection’s (DEP) Advanced Wastewater Treatment Program provides Design, Programmatic, and Process Planning services focusing on the attainment of future stringent Total Nitrogen discharge limits for Wastewater Treatment Plants that discharge to the East River and Jamaica Bay. In joint venture, Hazen and Sawyer is leading the effort to coordinate the ongoing $1.2 Billion of construction under the first phase of this program, provide design guidance and process planning modeling to assess the scope of needed upgrades for the second phase, and provide general process planning assistance to assist DEP plan for future treatment challenges.
Project Outcomes and Benefits
- Provided design guidance that became the bedrock of DEP’s current Phase I BNR Construction Program.
- Coordinates more than 30 ongoing construction contracts of an aggregate value of over $1.2 Billion to ensure compliance with interim Nitrogen stepdown limits.
- Evaluates new technologies’ applicability to DEP’s programs and infrastructure.
- Provides process planning assistance as potential new treatment regulations are discussed with EPA and other regulatory agencies.
By 2017, the four Upper East River treatment plants need to reduce their current Total Nitrogen discharge by over 50 percent. AWT’s design guidance recommended Biological Nutrient Removal (BNR) as the City’s backbone technology for its Nitrogen program. However, the scope of upgrades provided under Phase I construction is insufficient to meet the final Nitrogen discharge limit; AWT is currently writing the Phase II BNR Facility Plan that will codify the scope of the second construction phase. Hazen and Sawyer will enable the DEP to implement the BNR process technology, achieve consent order completion milestones, and comply with future regulatory limits.
In addition to providing engineering and program management support to BNR upgrades currently underway, AWT is the vehicle by which DEP evaluates potential future treatment obligations. AWT frequently is asked to evaluate the appropriate technologies to comply with a possible future treatment obligation and provide a conceptual design and cost estimate. AWT also is asked to evaluate the impact of proposed changes to the input to DEP’s treatment plants. Recent examples include an assessment of the impact repealing a ban on commercial garbage grinders would have on DEP’s programs and infrastructure and an assessment of changed operating conditions at the Hunts Point WWTP once alum sludge residual from the Croton Water Treatment Plant once this facility is placed into service.
For more information on this project, or to discuss a similar project in your area, contactPaul Pitt, Ph.D., P.E. at ppitt@hazenandsawyer