Optimization through Design: Implementing Full-Scale Carbon Addition to 700 mgd of WWTP
- Mark Supplee PE, Sarah Galst PE, Robert Frost PE, Tom Sadick PE, Matthew Osit PE, Sue Liu PE., Sal Scapelito PE
As a final step in the implementation of their 20-year plan for Biological Nitrogen Removal (BNR), the New York City (NYC) Department of Environmental Protection (DEP) has installed and is initiating operation of supplemental carbon facilities to meet total nitrogen (TN) discharge limitations.
The DEP facilities are configured to make use of the readily biodegradable carbon present in the primary effluent (PE) for denitrification via a step-feed process approach, however there is insufficient carbon in the PE to support the needed denitrification to comply with permit limits. To overcome this limitation and improve nitrogen removal, supplemental carbon is being added to several of NYC’s BNR plants. DEP contracted with the joint venture of CH2M and Hazen to design supplemental carbon (glycerol) addition facilities at the Wards Island, Tallman Island, 26th Ward, Bowery Bay and Jamaica Wastewater Treatment Plants (WWTPs). The construction of the designs is complete and all facilities are online with carbon addition being optimized. Optimization features were incorporated into the design of the carbon addition strategies to enhance overall TN removal while minimizing glycerol usage.
This paper will:
a) Summarize the existing step feed BNR process
b) Summarize the new glycerol addition systems’ process-mechanical and instrumentation features as they pertain glycerol dosing control strategies
c) Review glycerol system control strategies
d) Present comparative control strategy performance data from one of the operational full-scale systems.
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