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THE POSITIVE EFFECTS OF CORROSION CONTROL ON LEAD LEVELS, AND BIOFILMS


Published reports linking corrosion withinrndistribution systems and bacterial growth date back tornthe 1930's. Problems associated with corrosion caused byrnlow alkalinity acidic waters were recognized in Utica inrn1899 by G.Hodges. Because of high lead levels andrnbiofilm problems, the water quality department and itsrnconsulting engineers, undertook the present study torndetermine what steps would be necessary to control therngrowth of biofilms and reduce lead levels. A series ofrnpipe-loop studies was carried out; various phosphates,rnsilicates and pH/alkalinity adjustment chemicals wererntested. It was concluded that the pH/ alkalinityrntreatment was the most effective method to achievernoptimum corrosion control. Lime and soda ash were chosenrnto raise the pH and alkalinity. Lead levels were broughtrnbelow the Action Level (15ppb) to 10 ppb from a high ofrn160 ppb. Alkalinity levels were improved to a targetrnlevel of greater than 30 ppm in the finished water.rnAmong the most dramatic results of corrosion control wasrnthe reduction in the number of positive coliformrnsamples. During the years of 1991 through 1994, (Figuresrn1,6) coliform positive samples regularly exceeded the 5%rnTotal Coliform MCL, with as many as 30% of monthlyrnsamples being positive. Full implementation of arncorrosion control program in 1994, produced dramaticrnresults with no MCL exceedences in 1995-1997.......

【作者名称】: Connie K. Schreppel, David W. Fredericksen, Tony A. Geiss
【作者单位】: Upper Mohawk Valley Regional Water BoardrnUtica, New York, Upper Mohawk Valley Regional Water BoardrnUtica, New York, O'Brien and Gere Engineers Inc.rnSyracuse, New York
【关 键 词】: THE POSITIVE EFFECTS OF CORROSION CONTROL ON LEAD LEVELS, AND BIOFILMS
【会议名称】: 1997 water quality technology conference (WQTC 1997)
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 101,629,225
【摘要长度】: 1,407
【会议地点】: Denver, CO(US);Denver, CO(US)
【会议组织】: Upper Mohawk Valley Regional Water BoardrnUtica, New York;Upper Mohawk Valley Regional Water BoardrnUtica, New York;O'Brien and Gere Engineers Inc.rnSyracuse, New York;
【会议时间】: 1997
【上篇论文】: 外文会议 - Study and practice of railway support in broken and dilatant roof with high pretension and short cable bolting
【下篇论文】: 外文会议 - Historic and Predicted Hydrographs for the Gila Basin: Assessing Gila Water Projects in New Mexico

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