论文部分内容阅读
利用浙江缙云产天然沸石,对其分别进行静态吸附和再生处理,从而进行沸石再生途径的探索和再生最优条件的选择。实验表明,在沸石初次再生中,沸石再生过程的三个途径为:1盐溶液对NH+4的解吸;2盐溶液对K+、Ca2+、Mg2+的置换;3盐溶液对沸石表面形态进行改性,其中影响作用的大小顺序为1>3>2。而在其中途径2中,各阳离子的作用大小顺序则为Ca2+>K+>Mg2+;随着再生次数的增多,盐溶液对NH+4-N的解吸在再生过程中所发挥的作用逐渐增强,最终成为决定性因素,而另外两途径的影响力则逐渐减弱,途径2最终失去了再生效果;对于短期使用的沸石,其最优再生条件应以沸石再生后的吸附量大小来确定,再生时选用氯化钠溶液作为再生剂效果较好,长期使用的沸石,则应以盐溶液对沸石的解吸量大小来确定,此时氢氧化钠溶液较为合适;试验同时表明5 g/L的钠离子浓度为最优钠离子浓度。其次,OH-对于吸附了NH+4-N的饱和沸石的解吸具有促进作用,而温度对再生的影响并不明显。
The natural zeolite produced in Zhejiang Jinyun was used for static adsorption and regeneration respectively, so as to explore the exploration path of zeolite and optimize the regeneration conditions. Experiments show that in zeolite primary regeneration, zeolite regeneration process of the three ways: a salt solution desorption of NH + 4; 2 salt solution on the K +, Ca2 +, Mg2 + replacement; 3 salt solution zeolite surface morphology was modified , Where the order of magnitude of effect is 1> 3> 2. In the pathway 2, the order of the cations is Ca2 +> K +> Mg2 +. With the increase of the regeneration times, the desorption of NH + 4-N by the salt solution gradually increases in the regeneration process. Finally, Is the decisive factor, while the influence of the other two approaches is gradually weakened, and route 2 finally loses the regeneration effect. For short-term use of zeolite, the optimum regeneration conditions should be determined by the amount of adsorption after the zeolite regeneration regeneration, use of chlorine Sodium solution as a regenerant better effect, long-term use of zeolite, the amount of desorption of zeolite should be determined by the size of the salt solution, sodium hydroxide solution is more appropriate at this time; test also showed that 5 g / L of sodium ion concentration of Optimal sodium ion concentration. Secondly, OH- promoted the desorption of saturated zeolite adsorbed NH + 4-N, and the effect of temperature on regeneration was not obvious.