Great Neck- Wastewater Treatment Plant Improvements and Expansion

Posted on April 9, 2015

Client: Great Neck Water Pollution Control District (GNWPCD)
Location: Great Neck Wastewater Treatment Plant
Project Period: 2008- 2015
Project Cost: $65,000,000

Major Components

  • Biological Nutrient Removal Treatment System
  • Pumps/ Piping Systems
  • Influent Screening System
  • Air Compressors
  • Vortex Grit Removal System
  • Gravity Belt Thickeners
  • Primary Clarifier Improvements
  • Effluent Pumping Station
  • Final Clarifiers
  • Odor Control System
  • Concrete Repair of Existing Clarifiers
  • Emergency Generator System (1250 kW)
  • Oxidation Ditch (139’ X 240’)
  • Electrical Switchgear
  • Oxidation Ditch Pumping Station
  • Variable Frequency Drives/Controls
  • Primary Treatment Chemical System
  • Programmable Logic Controls (PLC)
  • Primary Sludge Pumping System Village Interceptor
  • Gravity Sewer Connection
  • New Return Activated Sludge/Waste
  • Activated Sludge (RAS/WAS) Pumping Station
  • Maintenance of Plant Operations (MOPO)
  • Ultraviolet (UV) Disinfection System
  • NYSEFC/NYSDEC/Funding/Grants Assistance
  • Rehabilitation of Digester Floating Cover
  • Site Work
  • Plant SCADA System
  • Lighting

Project Description

Projects Tasks

Project planning, engineering report, permitting, design plans, specifications, bid evaluations, and construction management services (DSDC).

This plant upgrade and expansion was designed to achieve the required effluent nitrogen (TN) removal as required by the State Pollutant Discharge Elimination Systems (SPDES) permit limits on effluent nitrogen imposed by NYSDEC/Long Island Sound Study (LISS). The goal of this project was to expand its capacity from 3.8 MGD to 5.3 MGD as a result of consolidation of the Village into the District and the elimination of the Village’s 1.5 MGD wastewater treatment plant (WWTP). To meet the NYSDEC/LISS requirements, an activated sludge Oxidation Ditch technology was selected. The upgrade and expansion of the GNWPCD wastewater treatment plant included: construction of a new oxidation ditch; construction of three (3) new final settling tanks, including a new final settling tank influent distribution chamber; upgrade of the influent screening system; upgrade and expansion of the grit removal system to a vortex grit system, including the installation of a new grit removal tank and upgrade of the existing grit handling equipment; upgrade of the existing primary sludge pumping system; chemical storage and feed system to provide for chemically enhanced primary treatment; construction of an RAS/WAS pumping station; construction of a UV disinfection system; abandonment and demolition of the existing trickling filters, final settling tanks, chlorine contact tanks, hypochlorite storage and feed system, and effluent sand filters. The GNWPCD also incorporated solids handling system improvements and a new emergency generator system/plant switchgear.

Generator pic

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