Control H2S - Increase Biogas Production
Reduce Sludge Yield/Increase Capacity/Control Foam

ISO 9001:2015

sludge & foodwaste

anaerobic digestion

city of Springfield

Springfield Missouri Municipal WWTP operates a three-stage anaerobic digester system that receives 250,000 gallons of sludge from their 45 MGD WWTP and 20,000-36,000 gallons of food waste per day. Biogas generated by digesters is used to generate electricity for the WWTP and heat for the digesters.

The Challenge/Problem 

Recent challenges faced by plant operators include:

  • Overloaded anaerobic digesters
  • High foam layers (up to 12ft thick in some digesters limiting capacity and throughput
  • High H2S content in biogas
  • Moderate VS destruction efficiency due to FOG load and overloading system
  • High cost for H2S control in sludge during processing and disposal
  • Insufficient biogas flow to offset natural gas use
  • High ammonia levels in digesters

SciCorp Plan & Implementation

SciCorp anaerobic digestion specialist Engineers met with Springfield plant management staff and reviewed plant performance data and operation challenges faced by operators.

SciCorp Engineers recommended a 3-month trial to treat the entire anaerobic digester system.  They recommended a daily dos of 40 gal/day of BIOLOGICTM SR2 to be added to the acidification hydrolysis anaerobic reactor that would feed 4 primary digesters which then feed into one polishing digester.

The plant management agreed to a shared financial risk approach to demonstrate and verify the benefits of using BIOLOGICTM SR2.


Within the time frame of the trial:

H2S content in biogas was reduced by 55%

Ammonia levels dropped by 12%

Foam layers were reduced to less than 12 inches from 12ft

VS destruction efficiency increased by more than 10%

Biogas production per kg VS feed to digesters increased by 30%+

H2S in digested cake decreased significantly

Need for supplementary gas was eliminated

Need for ferric chloride potentially eliminated

Other benefits realized:

potential for increasing organic load to digesters

Odor issues decreased significantly from digester system, sludge processing and general plant operations

Sludge yield (kg/TS / kg BOD + TSS influent from WWTP) decreased by 25-30% due to recirculation of centrate containing BIOLOGICTM SR2 to headworks of plant thereby reducing sludge generation from aerobic plant

Sludge mass requiring processing disposal decreased by 25%

Use of BIOLOGICTM SR2 demonstrated net positive cost benefit for plant operations

Problems Avoided

  • Shutdown of digesters to remove foam
  • Additional cost of biogas scrubbing
  • Supplementation of natural gas to provide power for WWTP operations
  • Ferric addition to sludge to control odor and struvite's
  • Limiting intake of food waste due to limitation in anaerobic system capacity
  • Odor complaints related to digester and sludge processing disposal operations
  • Corrosion o piping and equipment
  • Higher chemical costs due to price escalations
  • Increasing sludge transport and tipping fees

Reduction in H2S


Reduction in odor complaints


Reduction of foam


Increase in biogas
production kg VS


Reduction in
sludge generation

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