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首页> 美国卫生研究院文献>International Journal of Molecular Sciences >Chitosan Modified Zeolite Molecular Sieve Particles as a Filter for Ammonium Nitrogen Removal from Water
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Chitosan Modified Zeolite Molecular Sieve Particles as a Filter for Ammonium Nitrogen Removal from Water

机译：壳聚糖改性的沸石分子筛颗粒作为滤除水中氨氮的过滤器

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摘要

Drinking water containing a high amount of ammonium-nitrogen (NH -N) is not effectively removed by conventional treatment processes and can cause eutrophication. In this research, a composite adsorbent based on chitosan crosslink with zeolite molecular sieve (CTS-ZMS) was prepared for NH -N removal through dynamic adsorption filter experiments. Effect of bed depth (30, 50 and 70 cm), flow rate (32, 49 and 65 mL/min), initial pH value (4.5, 6.5 and 8.5) and influent NH -N concentration (3, 5 and 7 mg/L) was examined by using a filter column packed with CTS-ZMS particles. The Thomas model was applied to study the breakthrough curves and adsorption capacity. The optimal process parameters of the aforementioned factors were obtained at bed depth of 70 cm, flow rate of 32 mL/min, pH of 6.5 and initial NH -N concentration of 7 mg/L. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Fourier Transform Infrared Spectroscopy (FTIR) were investigated to analyze the structure and morphology of the CTS-ZMS adsorbents before and after 3 months running. The EDS and FTIR results showed Na and the active functional groups of -OH, -NH and -COO on CTS-ZMS adsorbent particles reacted with ammonium nitrogen. The results of this study supported the use of CTS-ZMS to improve drinking water filtration processes by increasing ammonium nitrogen reductions.
机译：常规处理方法不能有效地去除含有大量铵氮（NH -N）的饮用水，并且会引起富营养化。本研究制备了一种基于壳聚糖与分子筛分子筛交联的复合吸附剂（CTS-ZMS），通过动态吸附过滤实验去除了NH-N。床深度（30、50和70 cm），流速（32、49和65 mL / min），初始pH值（4.5、6.5和8.5）和进水NH -N浓度（3、5和7 mg / min）的影响L）通过使用装有CTS-ZMS颗粒的过滤柱进行检查。采用托马斯模型研究了穿透曲线和吸附能力。在床深70 cm，流速32 mL / min，pH 6.5和初始NH -N浓度7 mg / L的条件下获得了上述因素的最佳工艺参数。研究了扫描电子显微镜（SEM），能量色散X射线光谱（EDS）和傅里叶变换红外光谱（FTIR），以分析CTS-ZMS吸附剂运行3个月前后的结构和形态。 EDS和FTIR结果表明，CTS-ZMS吸附剂颗粒上的Na和-OH，-NH和-COO的活性官能团与铵氮反应。这项研究的结果支持使用CTS-ZMS通过增加氨氮的减少来改善饮用水过滤过程。

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