Premium
Effect of nitrification on corrosion of galvanized iron, copper, and concrete
Author(s) -
Zhang Yan,
Griffin Allian,
Edwards Marc
Publication year - 2010
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.2010.tb10093.x
Subject(s) - nitrification , galvanization , copper , metallurgy , corrosion , disinfectant , sloughing , materials science , chemistry , nitrogen , composite material , medicine , organic chemistry , layer (electronics) , pathology
Nitrifying bacteria rapidly colonized iron, plastic, and lead materials, more slowly colonized galvanized and stainless steel, and had difficulty surviving in relatively new copper pipes under conditions found in premise plumbing. Nitrification significantly decreased pH and dissolved oxygen (DO) in all pipe materials and sometimes caused sporadic sloughing of very high total organic carbon concentrations from cast‐iron coupons. The release of zinc from galvanized iron was reduced six times because of lower DO resulting from nitrification. Nitrification did not significantly increase weight loss as a result of corrosion among the three disinfectant conditions (no disinfectant, chlorine, chloramine plus nitrification) for cast‐iron, new lead, old lead, copper, galvanized‐iron, stainless‐steel, or concrete pipe material. Nitrification did not cause copper pitting corrosion or increase copper release in this study.