Skip to main content

Biologically Enhanced HRC System Solving Peak Wet Weather Flow Challenges

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


A pilot test was conducted with a ballasted flocculation/high rate clarification (BF/HRC) unit at the P Street Wastewater Treatment Plant (WWTP) to investigate the potential of activated sludge addition to enhance biochemical oxygen demand (BOD) removal. Primary clarifier effluent and varying concentrations (100 to 800 mg/L) of mixed liquor suspended solids (MLSS) from the WWTP's stabilization basin were mixed (for two different contact times) and fed to the BF/HRC unit. To determine the performance of the BF/HRC, influent and effluent total and soluble BOD, chemical oxygen demand (COD), and total suspended solids (TSS) were measured. The soluble BOD unit removal was higher at the lower MLSS concentrations, and was 7 mg/L per 100 mg/L MLSS at an MLSS concentration of 200-400 mg/L. The longer detention time yielded slightly higher BOD removal efficiency and average TSS removal was 98%. The results of the study indicate that BOD removal may approach 90% in a BF/HRC system with active biosolids addition.

Document Type: Research Article


Publication date: January 1, 2008

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 These proceedings are not peer reviewed.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
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Partial Open Access Content
Partial Open access content
Subscribed Content
Subscribed content
Free Trial 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