AWWA MTC64607

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 WellField;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 BlendedResidual Oxidants - BIOBROx; and, Bench-Scale Testing. The presentation also outlines an AwwaRF PCR - wastewater treatment plant (WWTP) Fixed-FilmStudy with the objectives of evaluating the use of a fixed-film reactor forimproving perchlorate degradation kinetics at a WWTP. Fixed-film reactor placed upstream of the oxidation ditchesmight provide/allow:steady microbial metabolism;anaerobic microenvironments; and,maximized availability of substrate. A third study outlined in this presentation dealt with Combined Arsenic/Perchlorate Removaland Residuals Treatment byElectrodialysis Reversal + BIOBROx. BIOBROx Pilot Test Objectives included:demonstrate efficacy BIOBROx approach;develop design criteria for blend ratio andEBCT;demonstrate sustained perchlorate removal; evaluate robustness of the process duringsystem upsets (system shut-downs, WW feedfailures, 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 EDRconcentrate 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 aneffective size ~ 1.4-2.0 mm. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

03/01/2007

Number of Pages:

34

File Size:

1 file , 1.4 MB