INNOVATIVE OPERATIONAL STRATEGY PROVIDES RELIEF FOR PROBLEMS WITH POOR SLUDGE SETTLEABILITY

$17.50 plus tax (Refund Policy)

Buy Article:

Abstract:

Secondary treatment at the 80-mgd Fresno-Clovis Regional Wastewater Reclamation Facilities (RWRF) has always been a challenge because of difficulties with achieving good sludge settleability. Sludge volume index (SVI) measurements between 300 mL/g and 600 mL/g are often encountered, mainly because of a combination of viscous and filamentous bulking. A number of factors are thought to be responsible, including the high industrial content of the wastewater, long sewer residence times, and even possible nutrient deficiency. While long-term solutions were being sought for the plant, an innovative operational approach was implemented to help limit solids washout in the clarifiers and avoid discharge violations. The aeration basins were operated in a semi-settling mode, with the air being turned off in the last three zones of each basin two hours at a time. This was done on a timed cycle so that at any given time, half of the aeration basins were operating in the normal mode, while the other half were operating in the semi-settling mode. This approach allowed for a substantial reduction in the solids loading to the clarifiers without adversely impacting the nitrification process. In addition, some denitrification was also accomplished, thereby alleviating problems with denitrification and rising sludge in the secondary clarifiers. This operational approach offers treatment plants with poorly settling sludge operational relief while long-term solutions are being sought.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864704784147773

Publication date: January 1, 2004

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 These proceedings are not peer reviewed.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

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more