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Collection Systems for Community Wastewater Systems
Collection Systems for Community Wastewater Systems
CAWPCA Spring MeetingApril 26, 2013Dave Prickett, PE
OVERVIEW• Wastewater Management• Community Systems Plans• Collection Systems Alternatives• System Selection Considerations• Examples
Gravity & STEG Sewers
Gravity STEG
Treatment Peak flows from I/I
Peak flows from I/I;May minimize treatment requirements
Disposal/Reuse Potential salinity in coastal areas
Potential salinity in coastal areas
ConstructionDepth and dewatering concerns; conflicts with other utilities
Depth and dewatering concerns; conflicts with other utilities
Private Property Minimal post-construction access needs
Septage management required
O&M Facilitates access for routine maintenance
Slightly lower mainline pipe O&M needs than conventional gravity
Emergency Readiness
Self sufficient during outages if pump stations have generators
Self sufficient during outages if pump stations have generators
Low Pressure, Vacuum & STEP Sewers
Low Pressure Vacuum STEP
Treatment
Lowest I/I & high flow potential; pre-treatment
Relatively low I/I potential
Condition of existing septic tanks impacts I/I
Disposal/Reuse Minimal salinity
impactsSlightly higher salinity impacts
May minimize treatment requirements
Construction Shallow construction minimizes duration
Moderate construction impacts; need to site vacuum station
Shallow construction minimizes duration
Private Property
Significant access needs
Moderate access needs
Significant access needs
O&MOdor control needs Odor control needs
Odor control needs; septage management
Emergency Readiness
Significant concerns during power outages
Moderate concerns during power outages
Significant concerns during power outages