Abstract
The pipelines corrosion can result discolor and particle increase in tap water and the complaints from the consumers. It also has the economic and hydraulic impacts for the replacement of broken pipes and fouling of corroded pipes. This paper aimed to investigate the effect of processed drinking water on metal pipe corrosion in water distribution system and the relations between the bulking water quality and pipe corrosion. It was found that there is a close relation between iron corrosion and water quality parameters in water distribution pipelines. It was shown that lower pH and alkalinity can increase the corrosion rate, while higher chlorides and sulfate may cause pitting corrosion. DOC in pipe water would be beneficial for microbial induced corrosion.
Highlights
Because of the complicated biochemical reaction between the bulking pipe water and the pipe surface, the treated water meeting the standards for drinking water quality can’t always guarantee the water chemical stability and results from the occurrence of discolor and sand particles in tap water and the complaints of customers on water quality
The mechanism of iron corrosion processes can be a series of electrochemical or/ and microbial reaction occurring at the metal surface in contact with bulking water[5,6,7]
The metal is converted into ferrous solids (e.g. Fe(OH)2) which may be converted to ferric solids (e.g. Fe(OH)3) after reaction with oxygen. This complex process is believed to be influenced by many parameters of the bulking water: oxygen, pH, alkalinity, chloride and sulfate, water temperature, disinfectant residual, NOM, etc.[8,9,10,11]
Summary
Because of the complicated biochemical reaction between the bulking pipe water and the pipe surface, the treated water meeting the standards for drinking water quality can’t always guarantee the water chemical stability and results from the occurrence of discolor and sand particles in tap water and the complaints of customers on water quality. The mechanism of iron corrosion processes can be a series of electrochemical or/ and microbial reaction occurring at the metal surface in contact with bulking water[5,6,7]. The metal is converted into ferrous solids (e.g. Fe(OH)2) which may be converted to ferric solids (e.g. Fe(OH)3) after reaction with oxygen. This complex process is believed to be influenced by many parameters of the bulking water: oxygen, pH, alkalinity, chloride and sulfate, water temperature, disinfectant residual, NOM, etc.[8,9,10,11]. Biodegradable dissolved organic carbon (BDOC) and assimilated organic carbon (AOC) are stated to be responsible for microbiological corrosion[12,7,10]
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