This slide presentation outlines a study on efficient biodestruction of contaminated electrodialysis reversal concentrate at the Magna Water District in the northwest corner of the Salt Lake Valley, Utah. Background information includes: perchlorate contamination discovered at Barton Well
Field;
Well Water Treatment Alternatives Evaluation - electrodialysis reversal (EDR);
Coagulation/Pressure Filtration Pilot Studies;
Arsenic Treatment Alternatives Evaluation; and, EDR selected for the combined treatment of perchlorate,
arsenic, and total dissolved solids (TDS). Topics covered include: biological residuals treatment; Biodestruction of Blended
Residual Oxidants - BIOBROx; and, Bench-Scale Testing. The presentation also outlines an AwwaRF PCR - wastewater treatment plant (WWTP) Fixed-Film
Study with the objectives of evaluating the use of a fixed-film reactor for
improving perchlorate degradation kinetics at a WWTP. Fixed-film reactor placed upstream of the oxidation ditches
might provide/allow:
steady microbial metabolism;
anaerobic microenvironments; and,
maximized availability of substrate. A third study outlined in this presentation dealt with Combined Arsenic/Perchlorate Removal
and Residuals Treatment by
Electrodialysis Reversal + BIOBROx. BIOBROx Pilot Test Objectives included:
demonstrate efficacy BIOBROx approach;
develop design criteria for blend ratio and
EBCT;
demonstrate sustained perchlorate removal; evaluate robustness of the process during
system upsets (system shut-downs, WW feed
failures, diurnal variations in WW); and,
identify optimal biogrowth support medium. Experimental design included:
Phase 1 - Biological Acclimation; Phase 2 - % Blend and EBCT Optimization;
Phase 3 - Sustained Removal;
Phase 4 - Robustness Characterization; and,
test with four different biogrowth support media:
3 GACs of different sizes and 1 plastic medium. Conclusions drawn include:
efficient, sustained removal of oxidants in EDR
concentrate can be achieved using BIOBROx process;
complete degradation;
short contact times;
wastewater is only amendment;
BIOBROx is robust with respect to process upsets;
WW shut-off;
Temperature; Diurnal variation;
System shut-downs; and,
Optimal biogrowth support medium was GAC with an
effective size ~ 1.4-2.0 mm. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.4 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 34 |
| Published : | 03/01/2007 |
