Problems in treating wastewater using macroporous adsorption resins

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This post was last edited by stony_wanghc on 2010-12-27 09:02. Reply to 1# Completely soaked. Hello, original poster! Firstly, in my opinion, when using adsorption methods to treat wastewater, adsorption works well, but desorption is problematic; generally, washing with water is required (which generates new wastewater, and if recycled water is used, it needs to be recovered to a certain standard). At the same time, new desorbents must be introduced, and these substances need to be effectively recovered. First, you need to look at your adsorption ratio, that is, the concentration factor; if it’s not high, opt for another method. First question: How much can generally be removed in the initial stage of desorption? Based on sampling, once it is detected that the desorbent has been released, discharge should be stopped and collection should begin. The proportion depends on the size of your adsorption column as well as the characteristics of the feed material; it is determined through testing ； You can also try this: after the washing, use air flow to blow away the water (to check whether blowing has an effect on the adsorbed substances; in my experience, it usually isn’t possible to blow them away), and then proceed with desorption – in this case, there will be no waste liquid to dispose of before desorption. Second: After the desorption is complete, it is generally possible to use purging to dry out the remaining desorbing agent, and then it can be cleaned thoroughly with water amounting to 1–2 times the volume of the column (the amount required varies slightly depending on the desorbing agent; this can be determined through experimentation). For this wastewater, you can take samples of the effluent during the cleaning process to test the residual amount of the desorbent or the COD; if these values are high, it is necessary to collect and recycle the solvent. Generally, it starts high and then gradually decreases; therefore, intermittent sampling is needed to monitor the concentration, so as to determine the concentration or volume of wastewater that can be discharged directly (and thus determine when collection and recycling of wastewater can be stopped). There are various recovery methods; generally, distillation is used (and rectification is required if the standards are not met). The ultimate goal is to reduce the COD in wastewater; by using desorbents, it is possible to recycle them, and the water used for cleaning can also be reused after being recycled for washing before and after desorption, thereby reducing the amount of wastewater discharged. This is just my personal opinion; if there are any mistakes, I hope the original poster and all the experts will forgive me and offer their guidance. If you feel there are any parts that are not clear, you can contact me; more details can be found in my profile. 1. After adsorption is complete, it is usually washed with water and then desorbed; how much of the liquid used in the initial stage of desorption can generally be discarded? : ]) W- ?8 X4 ^; J' u q: r9 l 2. After the desorption is complete, if the desorbent (such as ethanol) is replaced with water, then wastewater containing the desorbent will be generated? How should this wastewater be treated? Is it necessary to recover the desorbent? If so, how? Otherwise, will this water stream containing the desorbent carry a large amount of COD? This is my first time dealing with macroporous adsorption resins, and I know very little about them; there are many things I don’t understand. Please forgive me if I make any mistakes. I would appreciate it if experienced experts could offer some guidance.