What are various indicators of corrosion?
Corro?sion and material erosion can occur in a wastewater treatment facility for a variety of reasons:
• When a metal is immersed in non-aerated water or a non-oxidizing acid, hydrogenation can occur.
• Corrosive chemicals include chlorine, a variety of acids and alkalis, and ferric chloride.
• Hydrogen sulphide (H2S) gas can attack metallic components directly (i.e. steel tanks, gratings and walkways, structural members and equipment).
• Anaerobic sulphate-reducing bacteria can eat away at metal and concrete's protective sulphate coats, leaving them vulnerable to sulphuric acid corrosion caused by H2S oxidation.
• Fatigue corrosion causes cracking or breaking in practically all ductile metals. The ability of metals to endure the effects of fatigue corrosion is reduced by corrosive circumstances. This limit could be significantly reduced.
• Cavitation erosion is most commonly linked with pump impellers, although it can happen everywhere where there are high liquid velocities and rapid, dramatic drops in fluid pressure.
• Filiform corrosion is a type of corrosion that occurs on metal surfaces with organic coatings and is caused by pinpoint moisture penetration at many locations on the surface.
• Galvanic corrosion happens when two or more dissimilar metals are submerged in an electrolyte and generate an electrical current.
Indicators of Corrosion
Red water complaints and leaks are the most prevalent signs of corrosion in the distribution system!
If the frequency of these problems rises in a specific part of the distribution system, corrosion control may be required.Tuberculosis and iron bacteria are the most common causes of red water, whereas pitting beneath tubercles causes leaks. Other possible causes of these issues should, however, be considered.
Red water problems can be caused by high iron concentrations in the source water, while leaks can be caused by corrosive soil acting around the outside of the pipes as well as corrosive water acting on the inside of the pipes.
What could be the operators' Role?
During routine distribution system maintenance, the operator should look for indicators of corrosion and scaling. When old pipes are removed and replaced, they should be visually inspected for tubercles, pitting, or uniform corrosion, as well as severe scaling.
In the distribution system, dissolved oxygen and hazardous heavy metals can be employed as corrosion indicators in a considerably shorter time frame. At the same time, dissolved oxygen is evaluated at various places along the distribution system. If the dissolved oxygen content drops as you get further away from the treatment facility, corrosion is most likely consuming the oxygen. The operator should be aware.
Heavy metals toxic to humans, such as copper and lead, are checked at the tap. High levels of these metals in the water suggest corrosion in the distribution system, albeit the metals could have come from the source water in some situations.
Engineers and architects working on systems that must operate in severe settings have obstacles when developing treatment plants. To preserve equipment and materials, the designer must be aware of the impacts of temperature, humidity, and chemical activity, both liquid and gaseous, and account for them. Concrete and steel are the most common materials used in treatment facilities, both of which can quickly decay if not properly protected in a harsh environment. Proper design and careful maintenance are the keys to success.
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