人造沸石对氨氮废水的吸附及其电化学再生研究

Research on the artificial zeolite adsorption for ammonia nitrogen wastewater and its electrochemical regeneration

采用人造沸石对模拟氨氮废水进行吸附,并对其进行电化学再生,探讨了吸附及再生的影响因素。结果表明,最佳吸附条件:吸附时间为90 min,pH为中性或弱酸性,人造沸石投加量为120 g/L,在此条件下,氨氮去除率可达84%;最佳再生条件:电解时间为40 min,Na Cl浓度为0.1 mol/L,温度为50℃,pH为10,在此条件下,人造沸石再生率可达到97.48%。人造沸石重复使用6次后,再生率仍可达到88%以上。

Artificial zeolite has been used for the adsorption of simulated ammonia nitrogen wastewater ,and for its electrochemical regeneration. The influencing factors of its adsorption and regeneration are investigated. The re-sults show that the optimal adsorption conditions are as follows：the adsorption time is 90 min,pH neutral or weakly acidic,and the dosage of artificial zeolite 120 g/L. Under these conditions,the removing rate of ammonia ni-trogen can reach 84%. The optimal regeneration conditions are as follows：the electrolysis time is 40 min,concen-tration of NaCl solution 0.1 mol/L,temperature 50℃and pH=10. Under these conditions,the regeneration rate of artificial zeolite can reach 97.48%. The regeneration rate of artificial zeolite can still reach 88%after having been reused 6 times.