Warm Wastewater Turbulence Influence on Odor and Corrosion Intensity in a Concrete Sewer
Publication: Pipelines 2001: Advances in Pipelines Engineering and Construction
Abstract
When wastewater flows reach the 8- to 16-cubic feet per second, or cfs, (5- to 10-million-gallons-per-day [mgd]) range, the selection of gravity sewer pipe materials 15 to 25 years ago was limited basically to clay, concrete, and ductile iron. As flows went above 31 cfs (20 mgd), the choice of pipe materials for gravity flow was primarily concrete pipe. That was the case for the Water Works and Sanitary Sewer Board of the City of Montgomery, Alabama (Board), in the mid-1970s when it installed more than 21,950 meters (72,000 linear feet) of reinforced concrete sewer pipe of diameters ranging from 76 to 168 centimeters (cm), or 30 inches to 66 inches, in the Board's Catoma Basin. Concrete sewer pipe and manholes can have a life expectancy of greater than 50 years under certain environmental conditions. However, concrete sewer pipe and manholes are vulnerable to hydrogen sulfide (H2S) attack and to varying degrees of subsequent corrosion during the seasonal temperature cycles. For concrete sewer pipe in warmer climates or pipe that experience 3-month periods that average greater than 20 degrees Celsius (°C), the concrete should be protected; otherwise, the pipe could fail in as few as 10 to 15 years in aggressive H2S environments. The Board's Catoma Wastewater Treatment Plant (WWTP) will have influent temperatures that average 26 to 28 °C over a consecutive 3-month period. This temperature range usually occurs in June, July, and August.
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Copyright
© 2001 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Concrete
- Concrete pipes
- Corrosion
- Deterioration
- Engineering materials (by type)
- Environmental engineering
- Fluid mechanics
- Hydrologic engineering
- Infrastructure
- Lifeline systems
- Materials characterization
- Materials engineering
- Odors
- Pipe materials
- Pipeline systems
- Pipes
- Pollutants
- Sewers
- Turbulence
- Wastewater management
- Water and water resources
- Water treatment
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