Great Neck WPCD, Wastewater Treatment Plant Improvements and Expansion

Posted on July 1, 2013

Client: Great Neck Water Pollution Control District
Location: Great Neck Wastewater Treatment Plant
Project Type: Wastewater Treatment Plant Improvements and Expansion
Project Period: 2008-2015
Project Cost: $65,000,000

Major Components

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

Project Description

Projects Tasks:

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

Generator-picThis 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 SCADA-picnew 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.

D&B’s project responsibilities included design of the following systems:

Power Distribution

Due to the increase in electrical load, a new 13kv electrical service routed to a PSEG padmount transformer was provided to serve the Plant.  From the transformer, a 480/277 volt, 2000 amp  underground service was installed to the main incoming switchgear housed in a walk-in enclosure.  The switchgear serves the motor control centers located throughout the Plant and includes the automatic transfer switch for the emergency generator.  The project included 480 volt feeders to Plant load centers, modifications to existing motor control centers and new motor control centers.

Emergency Power

A 1250 kw diesel generator, housed in a walk-in enclosure with sub-base fuel tank, and tank leak and level monitoring.  The generator provides power to the entire Plant via the automatic transfer switch in the main incoming switchgear.

Lighting

Induction  lighting was provided for building interiors and LED lighting was provided for site access roads and parking areas.  Interior spaces included Class I, Division 1 explosion hazard areas.  Interior lighting controls included occupancy sensors and timers.  The exterior lighting was pole-mounted and controlled via photocells and timers.

SCADA

A SCADA system with RTUs located at buildings throughout the Plant using a fiber optic ring network.   The RTUs have operator interface terminals (OITs) and a central computer monitor, which provides both control and monitoring functions, is located at the Administration Building.

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