Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

A full-scale 18 month study at Pihlajaniemi treatment plant in Savonlinna Finland (PE 30 000) investigated the feasibility of using the primary clarifiers for flow and load equalization as well as for volatile fatty acid (VFA) production. The objective was to improve the process performance of the biological nutrient removal (BNR) process and find better use for the old primary clarifiers.

Equalization in this study decreased flow rate variations by 38% on an average. During the best months the flow to the biological process was practically constant. Hydrolysis was successful. The VFA concentration increased by 50%. The simultaneous removal of raw sludge did not cause any problems. The use of primary clarifiers for equalization and fermentation influenced the biological process in three ways: It improved the hydraulic control of the process, it equalized the load and conditions in the process and it increased the amount of readily usable organic matter. The transformation of old primary clarifiers for multipurpose primary tanks proved to be economically and technically feasible solution for responding to the requirements of BNR process.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 2007-01-01

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 These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect 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