Effluent Compliance/Biological nutrient removal performance focus: Nitrogen reduction case study

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Courtesy of In-Pipe Technology Company, Inc.

In-Pipe Technology Company, Inc., improves water quality for discharge or reuse by reducing influent organic loading and effluent pollutant levels. In-Pipe Technology has helped compliant plants function more efficiently and helped non-compliant plants achieve their targets. In-Pipe Technology works with both conventional treatment processes and advanced treatment designs including biological nutrient removal and membrane bioreactors.

Summary at a Glance

  • Project Location: Connecticut
  • Plant Type: Complete-Mix Activated Sludge
  • Project Installed: April 2010
  • Plant Size: 5.65 MGD
  • Performance Summary:
    • Effluent TN Before: 293 lbs/day
    • Effluent TN After: 194 lbs/day
  • 34% Reduction

In 2008, The Town was challenged to meet a new nitrogen discharge limit that was 70% lower than the plant, which was not designed for nutrient removal, could deliver. In-Pipe started the comprehensive collection system dosing program in 2007 and since then the plant has gone from discharging an average of 171 pounds per day of nitrogen down to just 71 pounds per day of nitrogen—a reduction of nearly 60%. With IPT, the average effluent nitrogen concentration was 10 mg/L compared with 24 mg/L before IPT.

The City selected In-Pipe Technology to help it improve nitrogen removal performance before and during plant upgrades. In-Pipe was implemented during the late summer of 2009 while the plant was averaging 126 pounds per day of effluent nitrogen. After In-Pipe was installed, nitrogen in the effluent decreased by 32%, to just 86 pounds per day on average.

Summary at a Glance

  • Project Location: Massachusetts
  • Plant Type: Sequencing Batch Reactor
  • Project Installed: November, 2009
  • Plant Size: 1.60 MGD
  • Performance Summary:
    • Effluent TN Before: 92 lbs/day
    • Effluent TN After: 59 lbs/day
  • 35% Reduction

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