How to remove chloride ions from water
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This post was last edited by Yu Qin on 2020-6-5 21:52. The chloride content in our raw water is relatively high, at around 700 ppm. What is the best method to remove it? (300 ppm is sufficient; this is mainly based on economic considerations.)
This post was last edited by wo_call_you on 2011-11-2 at 12:42. If the water volume is low, use RO. I searched online and here’s a link for you; there are even contact details for the relevant manufacturers. http://china.chemnet.com/tech/detail.php?id=23336 I hope that next time you encounter a problem, you will try to search for solutions on your own first.
1. The existing forms of chlorine include: Cl-, Cl2, HClO2, ClO2 (unstable), HClO3, HClO4 (unstable), as well as other complexes in the forms of -1 valence, 0 valence, +3 valence, +4 valence, +5 valence, and +7 valence. Only Cl- is the most stable, and chlorine in nature exists primarily in the form of Cl-. 2. For the removal of Cl- (it is also possible to consider avoiding its formation or reducing it), it is either replaced by other anions or removed together with other cations. Based on their different properties, they can be broadly classified as follows: Precipitation salt method: This involves using Ag+ or Hg+ to form precipitates with Cl-, thereby removing Cl-. Separation and interception method: Cl- is separated and removed by evaporation or membrane filtration. Ion exchange method: Ion exchange resin is used for replacement through exchange. Redox method: Cl- is removed by electrolysis or electrodialysis, reduction methods.
Reply to 2# wo_call_you: Thank you, teacher. Our water flow is high, around 300 cubic meters per hour. It’s suitable for producing desalinated water, but it’s not very good as water for single-use purposes or for replenishing circulating water； Using RO or ion exchange is too costly; I was wondering if there are any other better methods? I heard that there is a dechlorinating agent that can remove over 90% of chlorine; do you know anything about it? If any of the teachers are aware of this, please help by providing information on this topic, especially regarding the performance and handling costs. Thank you!
I tried to get in touch with the manufacturer, but without success. My position isn’t high enough to allow me to go on site inspections, so I’m turning to all of you for help!
Due to the high chloride content in the make-up water for circulating water, this imposes high requirements on the material used for heat exchangers. We encountered similar problems in the design of circulating water systems in previous projects, but it wasn’t 700 meters high as you mentioned (are you working in a salt lake area?) ), to ensure the ion concentration, we used soft water for supplementation, which was quite wasteful. In the current project design, some manufacturers claim that the chloride content can be reduced through pretreatment. This issue of operating costs needs to be considered comprehensively: one is the water price, and the other is the pretreatment cost
Reply to 6# yangzhenxj: I’m not in Yanchi. Pre-treatment is possible, but isn’t the cost relatively high?
Reply to 7# houmeihong11: The cost is not low. I’m currently working on project design and don’t have time to make comparisons. If pre-treatment is chosen, you can consult the manufacturer to find out what concentration the 700 material should reach after pre-treatment in order to achieve an appropriate concentration ratio at the lowest cost.
Reply to 8# yangzhenxj: Thank you!
Ion exchange, I guess. A conclusion can only be drawn after reviewing all the water quality analyses
This post was last edited by ike5 on 2011-12-27 at 16:54. A type of polymer-based chlorine reducer can be added. In the past, the most effective methods for removing chloride ions were the use of anion exchange resins or reverse osmosis, but both required additional external equipment, which posed certain limitations in terms of operation and use. It is difficult to remove chloride ions chemically, as most compounds of chloride ions are highly soluble in water, making it hard to eliminate them. The ionic chlorine remover introduced and developed by our company utilizes the world’s most advanced polymer nanotechnology; it is a macromolecular organic compound synthesized through bioengineering under specific conditions, and it is capable of rapidly removing chloride ions from water under various water quality conditions, with an effective removal rate of over 80%. This product boasts many advantages, such as low cost, fast response time, simple operation, and no need for additional equipment. Contact: Zhang Wujin 13817223104 ike5@163.com