Township of Parsippany-Troy Hills Wastewater Treatment Plant

Parsippany, NJ

We prepared an engineering report and bid documents for improvements to the screening and grit facilities at the Township of Parsippany-Troy Hills Wastewater Treatment Plant.

The engineering report described existing conditions, evaluated the existing screen and grit facilities based on the applicable design standards as indicated in the New Jersey Administrative Code Subchapter 23 (NJAC 7:14A-23.15 and .16), evaluated and made recommendations to improve the existing processes and presented a cost opinion. As part of the engineering report, screens from five manufacturers were evaluated. Due to the age of the Blower and Pump Building, the results of an XRF lead paint survey and a survey for asbestos containing materials was included in the report. The 16 million gallons per day WWTP currently operates a single mechanical screen on the first of the four active channels to the influent pump station wet well. A manually cleaned bar rack is utilized on the fourth channel. An out of service comminutor in the third channel needed to be removed. Two new mechanical screens were installed. The upper portion screens were located in a new room created at grade level in the headworks building. A washer/compactor was also installed to transport the screenings out of the room to a roll-off container.

Screened influent wastewater is conveyed to the two aerated grit chambers. The drive system for the grit conveyors in each chamber was not in service and there were operating issues with the existing pumps. The improvements to the grit chambers include installation of new baffles, grit conveyors and grit pumps. New grit classifying and washing equipment were installed in a new FRP building adjacent to the grit chambers. Compared to the former location, this reduced the distance in piping and the need to operate a grit conveyor.

During construction we provided construction administration and periodic construction observation services.