人造沸石负载纳米氧化镁同步脱氮除磷的研究
Study on the Simultaneously Removal of Nitrogen and Phosphorus by Using of Modified Artificial Zeolite Carrying Nano-MgO
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摘要: 氮、磷是引发水体富营养化的限制性因素,控制水体中的氮、磷总量可以有效抑制水体富营养化的产生。以人造沸石为研究对象,探究不同改性方法对人造沸石同步去除水中氮、磷的影响。主要工艺为高温碱（NaOH）浸改善沸石结构,高温盐浸（MgCl2）负载纳米态氧化镁。结果表明改性的最佳条件为:两阶段的烘干温度45℃;NaOH溶液浓度0.5 mol/L;MgCl2溶液的浓度1 mol/L。对NH4+-N和PO43-的去除效率分别可达到83.76%和74.24%。对人造沸石的热稳定性进行了实验,其烧失量达40.6%。最后,对吸附饱和的人造沸石进行脱附实验,脱附剂的选择为NaCl、KCl以及两者的混合液。NaCl对NH4+-N和PO43-都有较为明显的脱附效果,脱附率分别可达84.54%和59.35%。Abstract: Nitrogen and phosphorus are the restrictive factors of eutrophication,so the removal of N and P is of great importance to control this kind of water pollution.This paper focused on the effectiveness of simultaneously removing N and P from the wastewater by using modified zeolite.The artificial zeolite was chosen and the optimal way to modify the artificial zeolite was explored.The main process was alkali(NaOH) leaching to change zeolite structure and salt(MgCl2) leaching nano-MgO at high temperature.The results showed that the optimal conditions were as follows:the concentration of NaOH was 0.5mol/L,the concentration of MgCl2 was 1mol/L,the temperature of drying was chosen 45℃ and no incandesce.The best removal rates of NH4+-N and PO43- could reach 83.76% and 74.24%,respectively.The loss on ignition was tested and the number was 40.6%.The desorption effect of NaCl was better than KCl and mixture of NaCl and KCl,and the desorption rates of NH4+-N and PO43- could reach 84.54% and 59.35%,respectively.
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Key words:
- Asrtificial Zeolite /
- Nano MgO /
- Ammonia Nitrogen /
- Total Phosphorus
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