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Develop and Demonstrate Fundamental Basis for Selectors to Improve Activated Sludge Settleability: Phase II Lab Investigation

By
H. David Stensel, Ph.D., P.E.
H. David Stensel, Ph.D., P.E.
Dept. of Civil and Environmental Engineering 303 More Hall, Box 352700 University of Washington Seattle WA 98195-2700, Phone: (206) 543-9358, Fax: (206) 685-9185 Email: stensel@u.washington.edu
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Gang Xin, Ph.D., P.E.
Gang Xin, Ph.D., P.E.
University of Washington
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IWA Publishing
Volume
7
ISBN electronic:
9781843397939
Publication date:
September 2008

The primary objective of this research was to compare dilute sludge volume index (DSVI) control in equally-sized single- and multi-stage anoxic and anaerobic selectors relative to a control aerobic reactor without a selector, using a synthetic wastewater feed containing both readily biodegradable and slowly biodegradable substrates. A further objective was to compare filamentous microorganism populations and microbial community composition for the different systems by an automated ribosomal intergenic spacer analysis (ARISA) (Fisher and Triplett, 1999) method.

  • Describes the kinetic advantage of using multiple stages versus a single stage design for anoxic selectors for removal of readily degradable and slowly degradable substrates

  • Shows the importance of using a staged aerobic zone design after a selector to potentially improve sludge settling characteristics as indicated by sludge volume index (SVI)

  • Indicates the importance of considering the effect of slowly biodegradable substrate on SVI control.

  • Indicates the advantage a properly designed sequencing batch reactor can have for SVI control

  • Shows the potential for using a new molecular method, an automated ribosomal intergenic spacer analysis (ARISA), for characterizing activated sludge system microbial populations

This title belongs to WERF Research Report Series

ISBN: 9781843397939 (eBook)

Develop and Demonstrate Fundamental Basis for Selectors to Improve Activated Sludge Settleability: Phase II Lab Investigation
By: H. David Stensel, Ph.D., P.E., Gang Xin, Ph.D., P.E.
DOI: https://doi.org/10.2166/9781843397939
ISBN (electronic): 9781843397939
Publisher: IWA Publishing
Published: 2008

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