Nassau County DPW, Design of Interim Sludge Thickening Facility

Posted on July 1, 2013

Client: Nassau County Department of Public Works
Location: Bay Park Sewage Treatment Plant
Project Type: Design of Interim Sludge Thickening Facility
Project Period: 2010 - May 2013
Project Cost: $4,000,000

Major Components

  • Technical Design Report
  • Design
  • Construction Management Services
  • Structural Improvements/Modifications
  • Gravity Belt Thickeners (GBTs)
  • Thickened Sludge Pumping System
  • Waste Activated Sludge Booster Pump Station
  • Positive Displacement Air Compressor
  • Electrical Power Distribution
  • Polymer Feed System
  • Instrumentation/Control
  • SCADA System
  • Closed Circuit TV System (CCTV)

Project Description

Project BackgroundClosed Circuit TV System

The Bay Park Sewage Treatment Plant (STP) is a secondary treatment facility, which utilizes the activated sludge process. It serves the southwestern portion of Nassau County and is located in East Rockaway, New York. A residential area surrounds the plant on three sides, with the closest home abutting the plant property line.

The plant primarily receives domestic sewage with a small portion (1.0%) attributed to industrial sources. The permitted plant capacity is 70 mgd (maximum monthly flow). Secondary sludge is thickened by gravity belt thickeners, blended with primary sludge and anaerobically digested for stabilization. The sludge is transferred to plant storage tanks where it is fed to the sludge dewatering building, where the sludge is conditioned with polymer and dewatered using belt-filter presses. The final plant effluent is discharged into Reynolds Channel in the Hempstead Bay system.

This project is for the design and construction services of an interim sludge thickening facility at the Bay Park STP.

D&B Project Responsibilities

Closed Circuit TV System (CCTV)

D&B’s project responsibilities included a CCTV video monitoring system for the Gravity Belt Thickener area.

CCTV cameras were located in proximity to the Gravity Belt Thickeners and connected to a digital video recorder (DVR) and monitor located in the Electrical Room. The cameras were PZT (Pan Tilt Zoom), rated for use in the Class I, Division 2 explosion hazard area and corrosion resistant. The DVR has storage capability for record-keeping of videos and the ability to allow for instant searches of video history by date and time as needed.

See all Profiles related to Electrical

For more information about this service, email us at