Experimental Study on Removal of Ammonia Nitrogen in Micro-polluted Water by SDBS-Optimized Modified Zeolite
In order to improve the removal capacity of zeolite for ammonia nitrogen in slightly polluted water,the modification effects of different modifiers on zeolite were studied,and the best modifier was selected to optimize the modification of zeolite.The effects of zeolite particle size,modifier concentration,and modification time on removal of ammonia nitrogen by modified zeolite were explored.The results showed that sodium dodecylbenzene sulfonate(SDBS)had the best modification effect on zeolite,while the zeolite modified with hexadecyltrimethylammonium bromide(HDTMA)had no significant effect on ammonia nitrogen removal.In the optimization modification experiment,the particle size of zeolite had the greatest impact on the adsorption of ammonia nitrogen by zeolite.Zeolites with the particle size of 1～2 mm were modified with 30 g·L-1 SDBS solution for 10 h to obtain the best modified zeolite.At room temperature,1g of modified zeolite was added to a solution with an initial ammonia nitrogen concentration of 5 mg·L-1.The reacted zeolite was desorbed and regenerated with 1 mol·L-1 sodium hydroxide and sodium chloride solution.After 3 times of desorption and regeneration,the regeneration rate of the zeolite was 86.3%.The influence of single factor change of different temperature,pH and zeolite dosage on ammonia nitrogen removal efficiency was also analyzed.
Ammonia nitrogenZeoliteOptimization and modificationRegeneration
万方数据
维普
