AWWA WQTC65872

Since the discovery of perchlorate in drinking water sources 10 years ago, substantial work hasbeen done to optimize various abiotic and biological perchlorate treatment processes. Biologicalprocesses are now being considered largely because they produce no perchlorate-laden wastestream, and because associated operation and maintenance (O&M) costs are low. However, relatively little is known abouthow best to treat the effluent from an anaerobic, perchlorate-reducing bioreactor. Post-treatmentmust have the ability to achieve the following treatment goals:reoxygenation: Since biological perchlorate reduction requires near anaerobicconditions, dissolved oxygen must be supplied during the post-treatment process;residual organic carbon removal: the addition of an easily assimilable organicsubstrate can lead to the production of biologically unstable product water;sulfide and turbidity removal: under anaerobic conditions, sulfate can be reduced tosulfide, which is odorous, biomass that sloughs from the FXB during production mayproduce turbidity; and,disinfection: as with any drinking water treatment process, a disinfection step must beincluded in the FXB biological perchlorate treatment train.This work has demonstrated that these post-biological treatment objectives can effectively bemet using a 2nd-stage fixed-bed bioreactor with an inter-stage hydrogen peroxide dosing stepand a final chlorine disinfection step. Includes figure.

Product Details

Edition:

Vol. - No.

Published:

11/01/2007

Number of Pages:

4

File Size:

1 file , 110 KB