NaOH (Caustic) dilution system
NaOH (Caustic) dilution system
(OP)
I'm designing bulk caustic storage facilities for an existing 2 MGD water treatment plant. The plant currently receives bulk caustic shipments in 50 gallon drums and dilutes it to 25% in a day tank prior to feeding. Client would like to switch to tank truck delivery, so the obvious solution is to put in a new bulk tank to hold the 50% caustic from the tank truck and keep the day tank setup how it is.
Besides safety concerns, the main problem with storing 50% caustic is the low freezing point (~58 degrees). So any tank holding 50% will require heating or be located indoors.
It makes sense to me to go ahead and dilute it down to 25% right off the truck. This eliminates the freezing/safety concerns with storing 50% on site and also would not require daily batch mixing in the day tank. My idea wasn't received too well initially, but after some internet research I see that there are systems out there that can do this: http://www.powellfab.com/products/dilution/caustic... http://www.noritake.co.jp/eng/products/eeg/mixing/...
Now that the idea has caught on at the office, I've been given the go-ahead to investigate this option further and cost it out against the 50% storage solution. I would appreciate any input on the advantages/drawbacks of this type of system as well as information on other companies that may offer something that would work.
Thanks in advance.
Besides safety concerns, the main problem with storing 50% caustic is the low freezing point (~58 degrees). So any tank holding 50% will require heating or be located indoors.
It makes sense to me to go ahead and dilute it down to 25% right off the truck. This eliminates the freezing/safety concerns with storing 50% on site and also would not require daily batch mixing in the day tank. My idea wasn't received too well initially, but after some internet research I see that there are systems out there that can do this: http://www.powellfab.com/products/dilution/caustic... http://www.noritake.co.jp/eng/products/eeg/mixing/...
Now that the idea has caught on at the office, I've been given the go-ahead to investigate this option further and cost it out against the 50% storage solution. I would appreciate any input on the advantages/drawbacks of this type of system as well as information on other companies that may offer something that would work.
Thanks in advance.





RE: NaOH (Caustic) dilution system
RE: NaOH (Caustic) dilution system
RE: NaOH (Caustic) dilution system
You should investigate other options. You can buy caustic in larger tote containers. Caustic is also available at lower concentrations than 50%, like 25% for example. A rough comparison of shipping costs should be made. How far away are you located from the producer?
Local chemical suppliers are generally happy to dilute the chemicals prior to delivery to the site. Of course it will cost more, but the operators will not be upset at you for giving them additional work unrelated to water treatment.
I presently work at a site now where the chemical delivery is pumped off a tote within the delivery truck into a tote on ground by the delivery person. My operators do not have to touch the chemicals during the delivery process.
Note, caustic is typically diluted to 20% because that level has the lowest freezing point.
RE: NaOH (Caustic) dilution system