Dave Russell Forum Moderator 30 Posts
Re: Can you help me with pH correction of circulating water system?30 October 2013 at 11:03am
he reactions are stochiometric:
HCL disassociates into H+ and Cl-
The effect of H+ addition on alkalinity is
H2CO3 ↔ H++HCO3- which further disassociates to H+ +CO3= depending upon pH
The best way to find out is to test the system with titration of 1/50 N HCl on samples and see what works.
The easiest way to explain the effect is the system diagram attached.
The carbonate chemistry is complex, and because it has two reactions associated with it, it does not lend itself to easy computation.
There is a formula but it’s about two pages worth of computation, and at the risk of blowing my own horn, it’s found in my book Practical Wastewater Treatment, which is available in both Chinese and now in Spanish from John Wiley. Look on pages 72-80 for complex solution to the reactions.
Hope that helps.
For pH correction of circulating water system in thermal power plant, HCl dosing system is proposed. Wanted to know by adding the HCl, what would be the changes in the water parameter like HCO3, CO3, CO2, Cl, TDS etc. By adding 1ppm of 30% HCl what would be changes in other parameters interms of ppm. Similarly wanted the same for NaOCL dosing.
Have an insight or suggestion?
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