Reasons for the very low pH value of the water output from the mixed-bed! ! !
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Why is the pH value of the water output from the mixed bed very low after reverse osmosis, followed by treatment through the cation exchange bed and anion exchange bed as well as the first and second mixing stages? This post was last edited by li*ch1968 on 2009-3-14 17:55]
It is already low; ammonia needs to be added to adjust the pH.
You have really high requirements regarding water quality. What’s the quality of the raw water like? Is the chloride content in it high?
It could have been around 6; we needed to add ammonia solution for adjustment. Last edited by li*ch1968 on 2009-3-15 08:52.]
Pure water has a lower pH value due to the absorption of CO2 from the air. But it won’t be too low. Could it be that your cation resin hasn’t been regenerated properly?
Could it be that the ratio of resins in the mixed-bed system is not appropriate? Additionally, with the desalinated water having such a high concentration, where is this water used? What are the operating costs? Could you share that information? The operating cost for our system using two-stage reverse osmosis along with a mixed bed is 4.6 yuan per ton, while the cost for using one-stage reverse osmosis together with a mixed bed is 3 yuan per ton.
Your requirements for the manufacturing process are quite high! I don’t know what industry it’s used in