Discussion on the adsorption and regeneration of macroporous resins
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This post was last edited by Completely soaked on 2010-1-14 20:14. Dear friends: Is it necessary to regenerate large-pore resins using an alkaline solution after they have adsorbed organic substances and then desorbed them? The details are as follows: after analysis, the resin layer is washed with a 4% NaOH solution at a rate of 1–2 BV/hr.
Regenerating macroporous resins with an alkaline solution after adsorption is a relatively common conventional treatment method. It would be better if the original poster could provide more details, so that everyone can give you suggestions. It is necessary to specifically explain the basic characteristics of the organic matter being treated, as well as the adsorption and desorption processes, and the main functions of alkali solution regeneration, etc.
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One of the purposes of resin adsorption regeneration is to enable reuse, and it is one of the good methods for saving costs； The cost of raw materials required to regenerate the resin once is far lower than the cost of replacing it when it runs out, not to mention other expenses. Resin only has the ability to adsorb and displace substances; it does not possess a capability to remove them. It simply displaces substance B from A. When the resin becomes saturated with substance B, it loses its ability to displace more substances. At this point, other media must be used to displace these substance B molecules that are adsorbed by the resin, so that they can be removed. The more resin used, the more recycled materials are required, which means that subsequent investments will also continue. If it is in the initial design stage, considering changing the process and comparing various options would be advisable; the option that is more cost-effective and does not have any negative impact on subsequent processing should be chosen.
Is it using resin to adsorb organic substances from wastewater? The general regeneration of resins involves acids, bases, or salts. The original poster can consult the manufacturers of resin; they should be very familiar with this.
5# hhm123 Yes, this resin is a macroporous adsorption resin used to absorb organic substances in wastewater from chemical manufacturing processes.
Resins are used to absorb organic substances, but what about the regeneration liquid for those resins? What about high-concentration, high-salinity wastewater? Is evaporation treatment required?
Answering your first question: The essential process of resin adsorption regeneration is one of concentration and purification, which involves separating, purifying, or concentrating the useful substances. If there are useful substances that can be recovered in the regeneration liquid, their reuse can be considered ； If the composition is complex and difficult to recycle, incineration or disposal as hazardous waste can be considered. Answering your second question: For high-concentration saline wastewater, evaporation can be considered, with multi-effect evaporation being the best option. 7# hhm123
Thank you! I see; this technology seems quite useful for concentrating valuable materials. For ordinary wastewater, however, the costs need to be carefully evaluated.
The choice of reagent for regenerating macroporous resins depends on the properties of the target substance to be adsorbed; bases can be used for phenols and acids, acids can be used for amines, and organic solvents can be used for alcohols.