PWWPCD Biological Nutrient Removal Upgrade and Wastewater Treatment Plant Improvements

Through improvements to the biological nutrient removal process and various upgrades to the wastewater treatment plant, D&B assisted the Port Washington Water Pollution Control District in successfully reducing the amount of total nitrogen in the plant’s effluent as required by the SPDES permit limits on effluent nitrogen imposed by NYSDEC/Long Island Sound Study.  To meet the requirements, an Activated Sludge Oxidation Ditch technology was selected and required various changes to the existing process train. This included Influent Screening; rehabilitation and modification of the three existing Secondary Clarifiers; addition of a fourth Secondary Clarifier; replacement of Trickling Filters with a 27,000-square-foot Oxidation Ditch; and replacement of Chlorine Contact Tanks with an Ultraviolet Disinfection System.

The project was completed ahead of schedule and below the original bid amount, and all Consent Order requirements were satisfied. D&B’s scope of services provided included project planning, engineering report, permitting, design plans, specifications, bid evaluations, engineering services during construction, operations assistance, field services for plant start-up, and construction management services.