HOW TO CONTROL CORROSION IN ETP PLANT
Published on by JAHANZEB MUSHTAQUE SOOMRO, ENVIRONMENT ENGINEER in Technology
Hello, I hope you are all fine.
What are the possible mitigation measures to control the corrosion in effluent treatment (ETP) Plants ?
Taxonomy
- Effluent
- Wastewater Treatment Plant Design
- Corrosion Prevention
3 Answers
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Sir ... we have a biological fully organic solution that has operated successfully for over 23 years now in Australia and several other countries.
We have engineering reports as to the effectiveness of the product from large cities and from India, China and New Zealand.
Our product 100% removes H2S....therefore extremely little corrosion.
Sta safe,
Hugh.
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Dear Jahanzeb, the 3 strategies mentioned by Gary Slenders are correct and best practice.
Another approach is to build or refurbish with corrosion resistant materials. For example: Plastic piping and conduits, fiberglass handrails and ducts, stainless steel pipe hangers and where structural strength is required, especially important is to use stainless steel for anchors that are installed into concrete.
Best wishes,
Thomas Getz,
Earth Cycle BioTechnology LLC
1 Comment
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Thank you
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Dear Jahanzeb,
There are a number of measures that can be taken that will assist in control of corrosion of concrete and steel structures within a wastewater treatment plant. The process of corrosion is mainly due to Sulphuric Acid within condensate in the head space above the wastewater stream. Hydrogen Sulphide present in the gas phase is in contact with the condensate is converted by bacterial slime to sulphuric acid.
Your options are:
1 - Cover the areas subject to corrosion and extract the head space are at a sufficient rate that you get the level of H2S down to below 5 ppm. This should be enough to prevent corrosion taking place. The extracted air will need to be treated through an odour control system.
2 - Protective coatings can be applied such as epoxy resins. It is essential that the surfaces are well prepared and any corrosion on existing surfaces removed. It is normally only the head space area that suffers from corrosion.
3 - Chemical Dosing - Iron Chloride doing of the influent will control the the sulphides in solution converting them to an inert solid. Magnesium Hydroxide and Caustic will raise the pH of the influent liquor reducing the available soluble H2S hence controlling the gas phase H2S
Generally your corrosion control strategy will incorporate a combination of these three options.
Regards
Gary Slenders
Principal Process Engineer - CEng MIChemE
Australia Odour Management Company
1 Comment
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Thank you so much.
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