Hypochlorite Feed System
Hypochlorite Feed System
(OP)
Hi. I'm new here...I just start working on a wastewater plant in Portugal and I've got to implement a hypochlorite feed system, to add chlorine in the water, to assure a secure chlorine residual of 0,2-0,5 ppm.
I saw thread164-78627 in the forum but I couldn't ask there because the thread was in archive, so I'd to create another one with same subject.
I'd like to know what all of you think about it and help me to know what's the best way to do this system (equipments, etc).
Thanks.
I saw thread164-78627 in the forum but I couldn't ask there because the thread was in archive, so I'd to create another one with same subject.
I'd like to know what all of you think about it and help me to know what's the best way to do this system (equipments, etc).
Thanks.





RE: Hypochlorite Feed System
RE: Hypochlorite Feed System
As I said, I'm just starting my work in engineering because I just left the University a small weeks ago.
For now, I know that I'll need a reservoir and a retention tank for hypochlorite solution, but I don't know what's the best material to do that. Another question is the valves and control systems, I mean the chlorine control (PID) and the pumps that will be needed.
Can you help me with this? Do you have any documentation about something similar?
RE: Hypochlorite Feed System
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RE: Hypochlorite Feed System
Thanks again ;)
RE: Hypochlorite Feed System
As far as the injection system you need help with, a lot of the design depends on what you have already. Usually hypochlorite is injected into the water stream early, before any storage or pressure tanks. The mixing action of the water in the tank usually takes care of the distribution of the hypochlorite and gives it a sufficient "residence time" to act. If you can get 30 minutes of residence time in your tank (volume / flow rate) and are confident the flow is not short circuiting from inlet to outlet, then that will probably work for starters.
The amount of hypochlorite and the pressure to pump it in depends on the flow and pressure of your system into which you are pumping. Pumps I have seen have been Pulsafeeder or LMI pumps, which are typically designed for this kind of service. I think Pulsafeeder even sells package systems with a tank and everything.
Other than that, you will probably want some form of feedback to control the pump output. Again, the pump suppliers can provide this for you.
RE: Hypochlorite Feed System
Any of you know any other way to do the mixing? Is any other eficcient method to do it? Any sugestions???
Thanks again.
RE: Hypochlorite Feed System
Install your hypochlorite injection just upstream of the last control valve/shutoff valve ahead of the tank, or into the suction side of the water pump feeding the tank. Either method will ensure suitable mixing.
Orenda
RE: Hypochlorite Feed System
RE: Hypochlorite Feed System
You are working in a wastewater treatment plant. Correct? You want to add chlorine? The purpose of the chlorination?
What is the chlorinated water going to be used for?
You want to add hypochlorite storage tank, yes, or no? This tank should probably hold 1 1/2 of the delivery truck volume.
Is this a municipal wastewater treatment plant?
What is level of treatment in plant? Secondary, advanced, etc.
RE: Hypochlorite Feed System
I'd like to know if any of you have ever heard something about this, and your opinion about it. Thanks.
RE: Hypochlorite Feed System
What is the water used for?
RE: Hypochlorite Feed System
I just don't know if the mixture inside of the reservoir is efficient...I don't think so...
Thanks for your interest ;)
RE: Hypochlorite Feed System
The method that you have proposed with a submersible mixer will work and has been used successfully.
The submersible mixer should have power of approximately .5 kw per tank. You also need the hypochlorite storage tank, pump, and controller.
An alternative process would be to use a pump mounted outside the tank to recirculate the tank contents.
Since you are just blending in a liquid, you do not need high energy mixing.
RE: Hypochlorite Feed System
About the alternative method...what's your sugestion?
RE: Hypochlorite Feed System
The alternative would be to use a pumped recirculation. The pump would take suction from one side of the tank and pump it to the other side. You can add the hypochlorite inline on the discharge side of the pump. With a pumped system, you would not have to drain the tank to do the installation.
RE: Hypochlorite Feed System
With submersible pupms there's no need to drain the tank either.
RE: Hypochlorite Feed System
One thing that you might want to think about is the problem of pumping hypochlorite. Most users have had bad experiences because the hypochlorite is hard to pump because hypochlorite will off-gas, and is also very corrosive when it leaks.
The recirculation system will take suction from one tank cell or both (with a manifold) and pump to the opposite end of the tank or tanks. The pump would force the water through an eductor that would also be used to inject the hypochlorite. Portacell makes a hypochlorite injector like this. You need to have a 20-25 psi drop across the injector to inject the hypochlorite. With an inductor, no hypo pumps are needed.
http://www.portacel.co.uk/welcome.htm
The recirculation system is probably more user friendly and reliable.
RE: Hypochlorite Feed System
Well, it's not easy to explain, so I think it's better to send you a scheme with the instalation.
How can I do that?
RE: Hypochlorite Feed System
RE: Hypochlorite Feed System
www.megacontrol.pt