Neptune beach wastewater treatment plant case study


Courtesy of In-Pipe Technology Company, Inc.

Performance History and Discussion
The City of Neptune Beach chose In-Pipe Technology to improve effluent quality and reduce operating expenses at the WWTP. In-Pipe Technology adds high concentrations of live, heterotrophic bacteria into the collection system - transforming it into a pretreatment reactor. As a result, the incoming pollutant load is lower and the effectiveness of the treatment process is enhanced.

Over the first nine months of In-Pipe service, the average daily effluent CBOD dropped by nearly 50% - from 17 lbs/day to 9 lbs/day. In addition the average daily effluent nitrogen went from 126 lbs/day before In-Pipe, down to 86 lbs/day with In-Pipe - a reduction of over 30% compared with baseline conditions.

The Neptune Beach WWTP has also lowered air delivery to the aerobic digesters by 60%, saving the plant energy expenses to run the digester blowers. This is possible because In-Pipe bacteria operate effectively under aerobic, anoxic and anaerobic (using fermentation) conditions to deliver superior solids destruction without large amounts of free oxygen.

The WWTP is currently undergoing a retrofit to convert the process from its current configuration (contact stabilization) to an integrated fixed film activated sludge (IFAS) system. During the retrofit the plant will be limited to operating with just half of the available biological processing capacity, In-Pipe treatment during the retrofit period will ensure that the plant maintains acceptable operations - even with reduced capacity.

Present Conditions
The City of Neptune Beach was awarded a grant from the Florida Energy and Climate Commission to use In-Pipe Technology to improve the efficiency of the WWTP by reducing aeration energy consumption, sludge handling & hauling and FOG-related service calls.

Project Installed: August 2009
Plant Size: 1.5 MGD
Service Objectives:

  • Improve Effluent Water Quality
  • Reduce Effluent Total Nitrogen
  • Improve Energy Efficiency
  • Control Hydrogen Sulfide (H2S) Odor and Corrosion

Performance Summary:

  • 46% Reduction in Effluent CBOD
  • 32% Reduction in Effluent Total Nitrogen

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