Pearl river valley water supply district case study


Courtesy of In-Pipe Technology Company, Inc.

Performance History and Discussion
In-Pipe Technology implemented the first phase of a collection system Professional Services Program in 2001. Beginning in 2002, additional collection system basins were added to the services program. Currently, the treated areas include the North and South shore of the Pelahatchie Bay, the Main Harbor, and two Lagoon Waste Water Treatment Plant (WWTP) collection systems. As a result, these treated areas of the collection systems achieve significant odor, FOG and corrosion control benefits,

In-Pipe performs visual inspections of the dosing locations during regularly scheduled service visits to monitor panel functionality, refill microbe reservoirs, observe wet well oil and grease conditions, and make any necessary adjustments. Each location is monitored for pH and hydrogen sulfide (H;S) in solution to assure optimum, odor and corrosion control performance. Conditions requiring any additional action are coordinated with the Pearl River maintenance staff. Dosing rates are based on maintaining FOG, odor and corrosion control performance metrics and field evaluation with the Pearl River maintenance staff.

In-Pipe utilizes the Environmental Protection Agency (EPA) proposed guidelines to evaluate odor and corrosion potential, which states that hydrogen sulfide concentrations < 0.5ppm significantly reduce corrosive conditions within the sewer system.

Panels treating collection system lift stations and manholes apply the necessary microbe colonies to digest and reduce pollutant loading to the one remaining WWTP lagoon at Lake Harbor. IPT bacteria transform the collection system into an effective pre-treatment step to control lagoon odors and sludge accumulation. The continuous addition of IPT bacteria enhance the existing microcosm, which improves a lagoon's processing efficiency and extends the life cycle. The Lagoon WWTP systems service report is submitted as a separate document.

Present Conditions
Review of these residential, commercial and lagoon WWTP collection systems and In-Pipe inspections confirm the on going program performance and/or economic benefits:

  • Program services included additional kick start application required at lift stations to assure beneficial microbe colony dominance for optimum FOG, odor and system corrosion control.
  • Control of obnoxious odors in the treated areas of the collection system.
  • Reduced lift station cleaning and increased time between cleaning events.
  • Control of FOG accumulation without significant new FOG deposits observed.
  • Improved visual sewage water conditions with zero 'black' septic water conditions reported.
  • Control of solution sulfides at < 0.3ppm at all dosing locations for reduced odor and corrosion levels.
  • Elimination of prior mechanical (Ozone) or chemical usage for lift station odor control since late in the CY 2003.

Project Installed: May 2001
Plant Size: 0.50 MGD
Service Objectives:

  • Reduce Lagoon Sludge
  • H2S Odor and Corrosion Control

Performance Summary:

  • 90% Reduction of Total Solids
  • 80% Reduction of Sludge Depth

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