复合沸石动态膜系统的脱氨效能及其对沸石的同步回收

为同步实现吸附脱氨和微尺寸沸石回收，将沸石与动态膜技术耦合联用，构建了一种复合沸石-动态膜系统，并考察其脱氨和沸石回收效果。在初始氨氮质量浓度为10 mg·L⁻¹条件下，投加10 g·L⁻¹沸石可有效实现氨氮的去除，去除率为67%。吸附动力学和等温模型分析结果表明，该过程符合准二级动力学模型，Langmuir吸附等温模型拟合得到的最大氨氮吸附量为4.12 mg·g ⁻¹。按照1:1的质量比投加沸石与硅藻土，在投加量均为1 g·L⁻¹，流量为40 mL·min⁻¹，支撑膜孔径38 μm下可快速形成动态膜，出水浊度稳定在1 NTU以下，氨氮去除率可达到56%，在脱氨的同时能够实现沸石的有效回收。该研究结果可为复合沸石动态膜系统同步吸附脱氨和吸附材料回收提供参考。

Simultaneous ammonia removal and zeolite recovery by a composite zeolite dynamic membrane system

To achieve simultaneous ammonia adsorption and microscale zeolite recovery, zeolite was coupled with dynamic membrane technology to establish a composite zeolite-dynamic membrane system, and its ammonia removal rate and zeolite recovery efficiency were evaluated. At initial ammonia concentration of 10 mg·L−1, 67% ammonia could be removed effectively with 10 g·L−1 zeolite dosing. The adsorption kinetics and isothermal model indicated that the adsorption fitted well with the pseudo-second-order model, and the theoretical maximum adsorption capacity was 4.12 mg·g−1 predicted by Langmuir model. Zeolite and diatomite were mixed in the zeolite-dynamic membrane system at a mass ratio of 1:1, and the composite zeolite dynamic membrane could rapidly form under the conditions of 1 g·L−1 dosage, 40 mL·min−1 flow rate and 38 μm supporting membrane. After the formation of DM layer, the effluent turbidity remained stably below 1 NTU, and ammonia removal rate was 56%. Ammonia removal and zeolite recovery were achieved at the same time, which laid the foundation for simultaneous ammonia adsorption and adsorbents recovery for the composite zeolite dynamic membrane system in future.