Experiments for stimulating Microbiologically induced corrosion of copper pipes in a cold‐water plumbing system

Abstract

The influence of Fez03, pyruvate and a sealing putty on microbiologically induced corrosion in part of a copper cold-water plumbing system in a large building was investigated. For this purpose, these three substances were injected into the pipe lumen of a non-disinfected and a thermally disinfected section of a tap line affected by microbiologically induced corrosion. It was shown that these substances stimulate, in varying degrees, the microbiological corrosion of copper pipes.Untersucht wurde der EinfluR von FezOs, Pyruvat und einem Dichtkitt auf die mikrobiologisch beeinfluRte Korrosion in einem Teilbereich eines Kaltwasser-Hausinstallationssystems aus Kupferrohren.Dazu wurden diese drei Substanzen jeweils ins Rohrlumen des undesinfizierten und des thermisch desinfizierten Kupferrohres des unter mikrobiologischer Beteiligung korrodierenden Trinkwasser-Installationssystems injiziert. Es konnte gezeigt werden, daB diese Substanzen in unterschiedlichem Ausmal3 die mikrobiologische Korrosion von Kupferrohren fordern.

Effect of pH change on the performance and microbial community of enhanced biological phosphate removal process

“…OTU G80 (10 clones, 9.7% of GAO populations) belongs to the Sphingomonas, which is Gram-negative, aerobic and able to degrade refractory contaminants (Schmidt et al, 1992). It can secrete gellan exopolysaccharides (Ashtaputre and Shah, 1995), and corrode the copper pipes in drinking water distribution systems (Arens et al, 1995). Recently, a few Sphingomonas related species were identified as GAO (Beer et al, 2004).…”

Microbial Community Profile of a Lead Service Line Removed from a Drinking Water Distribution System

“…These lead-based solids include Pb(II) and Pb(IV) minerals. The most important passivating Pb(II) minerals include Pb 3 (CO 3 ) 2 (OH) 2 (hydrocerussite), PbCO 3 (cerussite), and Pb 10 (CO 3 ) 6 (OH 6 )O (plumbonacrite) (25). Aside from passivating solids, nonleaded solids and sorbed ions are often incorporated into the solids or scales that form on the surface of lead-based DWDS material.…”

“…For example, drinking water isolates of the genera Agrobacterium, Acidovorax, Sphingomonas, and Micrococcus have been reported to increase copper levels in drinking water pipes, with corrosion dependent on microbial activity (9,10,14,23,37). In other studies, Rhodococcus, Stenotrophomonas, and Xanthomonas have been shown to decrease copper levels by sorbing soluble copper in their exopolysaccharide (EPS) (2,28,47). Nitrification may also promote corrosion, as this process results in a pH drop which increases the solubility of most lead minerals commonly found on the surfaces of lead materials in DWDSs (48,49).…”

Corrosion of Copper in Cold-Water Plumbing Systems

“…From day 10 on, microorganisms were again found with normal R2A-Agar; copper-resistant microorganisms first reappeared on day 14. A number of additional experiments have shown that copper solubility could be influenced by agents that both stimulate and inhibit the growth of microorganisms [9]. Priv.…”