Missouri River Treatment Plant Improvements

Missouri River Treatment Plant Improvements

Location: Maryland Heights, Mo.

Client: Metropolitan St. Louis Sewer District

Completion Date: 2009

Burns & McDonnell is performing comprehensive wastewater treatment facilities master planning and design for improvements to the Metropolitan St. Louis Sewer District's Missouri River Treatment Plant near Maryland Heights, Mo. The Missouri River Treatment Plant is designed for an average flow of 28 million gallons per day (MGD) and a peak flow of 80 MGD. Treatment processes include screening, grit removal, preaeration, primary clarifiers, plastic media trickling filters, secondary clarifiers, effluent pumping, anaerobic digestion and belt filter presses for biosolids dewatering. The plant utilizes digester gas for generating electric power. The scope of master planning included projecting wastewater flows and characteristics, an assessment of regulatory issues that may affect plant requirements, and a capacity and condition assessment of all treatment unit processes.

Design of the first phase of improvements is in progress. The plant rehabilitation contract includes a new maintenance and storage building, a digester gas cleaning system to remove siloxanes from the digester gas, expansion of the plant process water system including new sodium hypochlorite disinfection system, replacement of four 120-foot-iameter primary clarifier mechanisms, and other structural, mechanical and electrical system repairs.

  • Facility capacity analysis and master planning
  • Expansion of capacity to 32 MGD
  • Peak flow capacity expansion to 190 MGD
  • New 190 MGD capacity preliminary treatment
  • New 30 MG peak flow storage basins
  • Odor control
  • Existing plant rehabilitation
  • Trickling filters
  • Effluent pumping
  • Anaerobic digestion
  • Digester gas cleaning system
  • Sludge dewatering
  • SCADA upgrade
  • Wetlands mitigation

The headworks contract includes the following new facilities:

  • 190 MGD peak flow capacity screens using bandscreens
  • Ferrous chloride storage and feed system for odor and corrosion control
  • 190 MGD peak flow capacity vortex grit removal system
  • 80 MGD peak flow capacity enhanced preaeration basins
  • 21,000 cfm capacity odor control system using biotrickling scrubbers
  • Three concrete-lined peak flow storage basins having a total volume of 30 MG with wash water system and return pumping station; system hydraulic capacity is 110 MGD
  • Replacement of effluent pumping station pumps with new pumps having firm capacity of 80 MGD
  • Plantwide supervisory control and data acquisition (SCADA) system improvements
  • Creation of 25 acres of wetlands to replace wetlands disturbed by other plant construction