AWWA WQTC69323

This powerpoint presentation begins by providing a brief overview of internal metallic pipecorrosion encountered in waterdistribution systems, factors impacting corrosion, and water treatment plants (WTPs) of the City of Marco Island. Study objectives and approach included the following: investigate the causes of copper pitting; review water quality and process chemistryto determine if correlations exist betweenwater quality, plant operations, and processcontrol changes;conduct interviews with consumers based oncomplaint records; and, provide recommendations on necessaryactions required to control copper pitting. Research findings indicate the following: the majority of the pitting problems occur inhorizontal cold water copper piping;many of the cases reported in the City's plumbingsystem are due to the Type M copper;there is sufficient evidence that Type Lcopper is much more durable and compatible withthe City's water quality;no conclusive evidence was found thatelectrical grounding is an issue in the copperpitting corrosion in the City's residential piping; a potential cause of pitting is a biologicalattack on the copper piping caused by thegrowth of nitrifying bacteria in the distributionsystem; and,the low alkaline water in the distributionsystem tends to be slightly under-saturatedfor calcium carbonate based on the LangelierSaturation Index. Includes table, figure.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

17

File Size:

1 file , 910 KB