AWWA WQTC64129

This slide presentation outlines the pilot scale findings of a study on removing taste and odor (T&O) and improving water quality with biologically active carbon (BAC) filters in the presence and absence of ozone. Pilot objectives were to evaluate the effectiveness of:pilot pretreatment unit in removing particulate,organics and any T&O causing compounds;BAC filters for removing T&O in presence andabsence of ozone; and,impact of pH depression and peroxide addition onozonation for removing T&O. Observations include:G/S filter configuration will not result in any compromise in particleremoval;G/S and and A/S and filter performances are similar for natural organic matter (NOM);G/S provides better seat for biological attachment/growth and mayimprove NOM removal by biological degradation;ozone can provide 0.5-log inactivation of Giardia at an applieddose of approximately 2.5 mg/L (target a O3/TOC ratio of 0.5);at an ozone dose of 2.5-2.7 mg/L (O3/TOC ratio of 0.5) willprovide up to 75 percent MIB removal and 45% TTHMs reduction;adding H2O2 at a H2O2/O3 ratio may not enhance MIB removal; biological GAC (G/S) filters may provide up to 30-40 percent MIBremoval through biological oxidation;biological Anthracite filters (A/S) show 10-18 percent MIB removalthrough biological oxidation;a process train consisting of clarification - ozonation - GACbiofilters is expected to provide adequate particle, NOM and MIB(90% or more) removal;a process train consisting of clarification - GAC biofilters (withoutozone), NOM, MIB removal and TTHM reduction is expected to belower compared to the one including ozonation; and,MIB removal in this process train is expected to be in the 30 to 40percent range. Additional MIB removal need to be achieved withthe addition of PAC. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2006

Number of Pages:

28

File Size:

1 file , 500 KB