AWWA WKICO66045

The objective of this powerpoint presentation was to design and optimize a system for sustained perchlorate removal. Background information on perchlorate is presented, along with fixed-bed (FXB) biologically activecarbon (BAC) bioreactors at bothbench-scale andpilot-scale. Bench-scale conclusions:sustained removal of perchlorate and nitrate achieved;dechloromonas is the dominant perchlorate reducing bacteria in thesystem;phosphorous addition increased relative abundance ofDechloromonas substantially (from ~15% to ~45%);increase in relative abundance of Dechloromonas is apparently thereason for improved reactor performance; and,microorganisms use acetic acid adsorbed on GAC during the lowacetic-acid period for some period, but the adsorbed acetic acid is notenough to support this for the entire period of low-acetic-acid tested(6 hours). Pilot-scale conclusions:efficient, robust perchlorate removal achieved in a FXBbioreactor; short contact times required;minimal impact from various process upsets;H₂O₂ + 2nd-Stage Biofilter + Chlorination provided effectivepost-treatment polishing; DO addition, removal of DOC/DBP formation potential, H₂S, turbidity,HPCs, perchlorate buffer; perchlorate is destroyed, not concentrated; and,overall system efficiency is 95+ percent. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

01/01/2008

Number of Pages:

28

File Size:

1 file , 1.1 MB