AWWA WQTC52946

Previous experience at East Bay Municipal Utility District (EBMUD) of Oakland,California, indicated much greater chloramine demand in biofiltered water than insettled and ozonated waters prior to biofiltration on exhausted granularactivated carbon (GAC)/sand filters. This excessive decay of chloramines resultedin a loss of chloramine residual and nitrification in the affected part of thedistribution system. In addition, continuing formation of haloacetic acids (HAA6)was observed in EBMUD chloraminated waters. Pilot filtration testing wasconducted at the Upper San Leandro Water Treatment Plant from October 1999through January 2000. The testing objectives were: to investigate the chloraminedecay due to biofiltration; to examine the performance of new GAC/sand andanthracite/sand filters as compared to the performance of existing GAC/sandfilters in order to make a recommendation for replacement layers; to determinethe removal of total organic carbon by the new GAC/sand and anthracite/sand filter media; and todetermine the removal of HAAs by the new filters and investigate ways of furtherminimizing HAA formation in chloraminated water. Includes 5 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

01/01/2000

Number of Pages:

13

File Size:

1 file , 300 KB