改性沸石造粒对氨氮的吸附性能

Adsorption Performance of Modified Zeolite Granulation on Ammonia Nitrogen

摘要

以改性沸石为原料，添加聚乙烯醇（PVA）和碳酸氢钠，制备出脱氨氮颗粒材料 MZ，并探究了投加量和 pH 值等因素对氨氮（NH₄⁺-N）吸附性能的影响。结果表明，在 MZ 投加量为 5 g/L、初始 pH 值为 7 的条件下，MZ 对 NH₄⁺-N 的去除率为 94.0%；溶液初始 pH 值过高或过低均会降低 MZ 对 NH₄⁺-N 的吸附效果； MZ 对 NH₄⁺-N 的吸附符合准二级动力学模型和 Freundlich 吸附等温线模型，且吸附过程受液膜扩散和颗粒内扩散共同控制，对 NH₄⁺-N 的饱和吸附量为 8.47 mg/g；4 种常见的阳离子对 MZ 吸附 NH₄⁺-N 表现出抑制作用，影响顺序为 K⁺ > Na⁺ > Ca²⁺ > Mg²⁺；经 5 次循环再生后，MZ 仍能保持 80% 以上的 NH₄⁺-N 去除率。结合材料表征分析结果，MZ 对 NH₄⁺-N 的吸附主要是以离子交换为主的化学吸附，同时具有一定的物理吸附作用，但作用程度较小。

Abstract

A nitrogen removal granular material (MZ) was prepared from modified zeolite with the addition of polyvinyl alcohol (PVA) and sodium bicarbonate (NaHCO₃). The effects of dosage and initial pH on the adsorption performance of ammonium nitrogen (NH₄ +-N) were systematically investigated. The results showed that the NH4 +-N removal rate of MZ reached 94.0% at an MZ dosage of 5 g/L and an initial pH of 7. The adsorption process of NH₄ +-N on MZ fitted well with the pseudo-second-order kinetic model and Freundlich adsorption isotherm model. The adsorption was jointly controlled by liquid film diffusion and intraparticle diffusion, with a saturated adsorption capacity of 8.4701 mg/g for NH₄ +-N. Four common coexisting cations exhibited inhibitory effects on NH4 +-N adsorption by MZ, following the order of K⁺ > Na⁺ > Ca²⁺ > Mg²⁺ After five regeneration cycles, MZ still retained an NH₄ +-N removal efficiency of over 80%. Combined with material characterization results, the adsorption of NH4 +-N on MZ was predominantly governed by chemical adsorption via ion exchange, while physical adsorption played a secondary role.

关键词

改性沸石 / 脱氮 / 吸附 / 造粒 / 离子交换

Key words

modified zeolite / nitrogen removal / adsorption / granulation / ion exchange

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基金资助

水生态环境修复长效治理关键技术开发与应用(2024-4-13)