How to Regulate Sulphuric Acid Dosing When it is not Required?

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What should be done with sulphuric acid dosing when its use is not required? How should the equipment be set up?   

We are installing the sulphuric acid (96%) dosing rig for pH correction. However, it may need to be used only for 8 weeks per year and we need to consider safety while cleaning and when it is not is use. 

We are looking into using non-return valves or similar valves to prevent the sulphuric acid from getting into water when it is not needed. Additionally, we are exploring the possibility of using continuous recirculation so the dosing rig is available when needed.

Does anyone have a better suggestion or experience with sulphuric dosing? 

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5 Answers

  1. Dear Muhammad,

     

    Hello

     

    Please tell me why do you need sulphuric acid dosing for 8 ​weeks per year.

     

    Where do you use sulphuric acid ? I  mean what do you treat ?

     

    Regards

     

    Lokesh Kumar

    Assistant Chemist

    Municipal Water Treatment Plant

    New Delhi (India)

    91-9818863285

    1 Comment

    1. Hello,

      During winter period the water source become pristine that coagulation caused high PH and to control that we dose sulphuric Acid.

      We dose Sulphuric pre-coagulation and its feed back control system.

      Lokesh it is more maintability then chemistry.

       

      Thanks

      Regards

      M Faisal

      1 Comment reply

  2. Simply stop the pump and remove discharge lines. If U donot like to remove connect the pump dosage with on Line PH metre. As soon as the Ph shall drop yr pump shall start dosing. we R using the same system at our Sui Gas Field Gas Purification " Water Cooling Towers " to maintain Ph of the system as per recommendation of our water treatment Company M/s NALCO.

    1 Comment

    1. Ilyas, the H&S reg are so strict that it is deemed not safe to remove discharge line every year. We have multiple PH meter on several places and PH is very maintained throughout the year. It is in winter when water become pristine and coagulation caused high PH. Please note that we cannot drop coagualtion to very minimum. Therefore Sulphuric acid dosing only required in winter period.

      It is more about safe maintability then any other thing.

       

      regards

      M Faisal

  3. The storage and piping are fully resistant to Sulphuric Acid. This rig is fully automated with various type of valves and this is the issue. While it is not in use those valve will start sticking and on restart those valve may not function as they should.

    So, in essence the asset may not be available after long shutdown, which fail it purpose.

    What I am looking is the best way to keep the rig functioning?

    1 Comment

    1. I am afraid something is either being degraded to cause the gummy precipitate to form around the valves or there exists impurities in your acid. I would maybe introduce a recirculating line on a closed loop just to keep the fluid from precipitating and or reacting with fitting parts because of being left idle for long periods of time.

  4. I would advise Stainless steel piping and reservoir for storage of H2SO4 it eats into pretty much everything else, especially if it stays idle for long periods of time.Does your install have plc controls with ph metering? If you can have someone programe the dosing thresholds and schedules? Then it will take care of itself. Hope this helps

    1 Comment