Savanna wastewater treatment plant case study

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Courtesy of In-Pipe Technology Company, Inc.

Performance History and Discussion
Jackson, MS selected In-Pipe Technology Company, Inc. for the Savanna WWTP with goals to reduce the quantity of waste sludge for disposal and control FOG in the collection system and at the plant. Jackson, the capital and largest city in Mississippi, was looking for ways to reduce sludge expenses from polymer to hauling and disposal fees.

In-Pipe was first introduced in Jackson on a limited basis beginning in 2002 for the purpose of controlling FOG and odors at certain locations. Over the course of the next two years In-Pipe was installed in several outlaying small communities that feed in the Savanna system for the same reasons. In August 2006, the City entered into a contract with In-Pipe to expand to the entire Savanna collection system with the specific intent of reducing operating costs at the plant.

After five months with the technology in place, Jackson decreased the Waste Activated Sludge (WAS) production by 35%, improved the ratio of pounds of WAS per million gallons of treated effluent by 51%, and increased volatile solids reductions. After 8 months the plant experienced an absolute WAS reduction of 49% from 557 dry weight tons to 287 dry weight tons and a 61% increase in COD removal. This combination of WAS reduction calculated as a function of COD removed creates a 60% decrease in WAS yield.

Jackson also selected In-Pipe for the Trahon WWTP (2 MGD) in December 2002 with goals to reduce sludge production and improve plant efficiency to optimize digester operation. Sludge production decreased 60% down an average of 38 sludge loads hauled a month. Power for digester aeration decreased significantly from almost constant air delivery to approximately one hour per day for mixing.

Present Conditions
In-Pipe continued in Jackson until October 2007 when a budget crisis forced the expansion service to terminate. In March 2008, six months after In-Pipe service was terminated, the WAS production had increased an average of 34% from 1.97 MGD to 2.64 MGD. In addition, the dry weight tons of sludge to be hauled for disposal had increased 39% from 103 tons to 143 tons during the three month period compared to previous year. In-Pipe is currently discussing a proposal with Jackson to resume service.

Project Installed: August 2006
Plant Size: 38 MGD
Service Objectives:

  • Reduce Sludge Production
  • Fats, Oils and Grease (FOG) Reduction

Performance Summary:

  • 49% WAS (Waste Activated Sludge) Reduction
  • 75% FOG Reduction

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