D&B’s Christopher LeHanka Presents BNR Treatment Start-up and Optimization for the Great Neck WPCD at the NYWEA Conference

Posted on February 20, 2015


D&B’s Christopher LeHanka

At this year’s New York Water Environment Association, Inc. (NYWEA) annual conference, D&B Senior Associate, Christopher LeHanka gave a presentation entitled the “Trials and Tribulations of Consolidation, Start-up and Optimization of BNR Treatment at the Great Neck WPCD.” Throughout his 14 year career in D&B’s Wastewater Collection and Treatment Division, Chris has gained extensive experience as a Project Manager/Project Engineer for numerous wastewater and environmental engineering projects, including the $60 Million Great Neck Water Pollution Control District Biological Nutrient Removal (BNR) Project that he presented at the NYWEA conference.

The District and D&B evaluated various treatment alternatives to achieve the required nitrogen removal imposed by the New York State Department of Environmental Conservation (NYSDEC)/Long Island Sound Study (LISS). Ultimately, the Activated Sludge/Oxidation Ditch technology was selected to provide the optimal and most cost-effective BNR treatment. The Oxidation Ditch technology was selected based on a projected operation/energy savings associated with its low dissolved oxygen levels and the ability of the process to achieve simultaneous nitrification/denitrification.


The District flow was introduced into the upgraded plant in January 2013 and through the consolidation of two systems, the Village flow was connected to the District in December 2013.  The plant upgrade and expansion project was substantially completed in January 2014.  In Chris’ presentation, he discussed the results achieved during the first year of operation and the issues associated with adjusting to a new plant and a new technology. Also discussed were the challenges faced during construction, the initial start-up of the Oxidation Ditch with only District flow, the addition of primary sludge to improve the Biological Oxygen Demand to nitrogen ratio (BOD/TN), the introduction of Village flow and the results from optimization of the BNR treatment process with the Oxidation Ditch manufacturer.

The presentation was well received at the conference and very informative…thank you Chris for a job well done!