Skip to main content

BATCH AND CONTINUOUS FLOW-REGIME SYSTEM COMPARISON PERFORMING BPR

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

A laboratory bench-scale sequencing batch reactor (SBR) and a continuous flow activated sludge (CFAS) systems were compared performing biological phosphorus removal (BPR). Both systems followed the Anaerobic/Oxic configuration, were fed with the same synthetic wastewater, inoculated with the same biological seed, and operated under similar conditions.

The results of this investigation show two main advantages of the SBR system over the CFAS system. The advantages were greater phosphorus removal efficiencies and better sludge settling characteristics. The average total phosphorus removal efficiency in the SBR system was nearly complete, while the average phosphorus removal efficiency of the CFAS system was 60 percent. Both systems however presented similar average carbon and nitrogen removal efficiencies of 92 and 60 percent respectively. The sludge settling characteristics developed in both systems are described by their average total suspended solids (TSS) concentration in the effluent and their average sludge volume index (SVI). Their average TSS and SVI values were 10 and 3 mg/L and 187 and 52 mL/mg for CFAS and SBR systems respectively.

Once both systems reached steady-state conditions, their biomasses were exchanged in order to observe the behavior of biomass in each reactor regime. Exchanging their biomasses resulted in inverting the characteristics of both activated sludges. The well-developed SBR biomass promptly deteriorated its BPR and sludge settling properties once it was exchanged into the continuous flow-regime. Contrary, the poor-developed CFAS biomass considerably improved its BPR and settling properties when exchanged into the batch system. Microscopic examinations of the biomass structures suggested that both systems developed similar microorganisms, but the presence of phosphate accumulating organisms was more robust in the SBR system. Observations found that filamentous organisms were equally present in both systems, however their presence in the CFAS system resulted in bulking sludge, which was successfully controlled by chlorination.

Based on the results of this investigation it is concluded that the SBR system offers more stable and efficient BPR performance than the CFAS system. In addition, it is clearly concluded that the SBR configuration greatly helps controlling the sludge bulking.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864705783867657

Publication date: 2005-01-01

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
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
X
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