Authors: Melcer, H.; Wunder, D.; Tam, P.; Parrella, A.; Clement, C.; Stenstrom, M. K.

Source: Proceedings of the Water Environment Federation, WEFTEC 2003: Session 71 through Session 83 , pp. 126-136(11)

Publisher: Water Environment Federation

Abstract:

A comprehensive capacity assessment was conducted of the liquid treatment train at the Western Lake Superior Sanitary District's (District) wastewater treatment plant. The plant incorporates a high purity oxygen activated sludge system. The assessment included detailed wastewater characterization to calibrate activated sludge simulators, mixed liquor settling and flocculation testing, and secondary clarifier stress testing. The capacity assessment identified simple, low cost upgrades that would increase plant capacity, reduce power consumption, and greatly increase operational flexibility of taking aeration tanks and secondary clarifiers off-line. The recommended modifications to the HPO aeration system were implemented to eliminate the plant capacity constraint that existed in the secondary system. The surface aerator drive horsepower in the first stage of each of the four HPO trains was increased from 100 to 125 hp and the pitched blade design of the surface aerator was replaced with an offset vertical blade impeller design. The result of this retrofit was to increase the oxygen transferred into the first stage such that it would operate with a higher dissolved oxygen concentration than before. The level of oxygen transfer improvement also allowed the plant staff to take down one of the four trains for maintenance and repair, an event that was impossible to implement in the past. Lastly, plant staff were afforded a level of flexibility that allowed them to optimize operational control and energy savings.

Document Type: Research article

DOI: http://dx.doi.org/10.2175/193864703784607133

Publication date: 2003-01-01

More about this publication?

• Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.
  
  WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
• Subscribe to this Title
• Membership Information
• About WEF Proceedings
• WEFTEC Conference Information
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: Earth and Environmental Sciences ,  General & Civil Engineering ,  Hydraulic & Environmental Engineering
• By this author: Melcer, H. ;  Wunder, D. ;  Tam, P. ;  Parrella, A. ;  Clement, C. ;  Stenstrom, M. K.

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers