开发一种离子交换工艺,用于从市政废水中去除和回收氨,使用基甲K基地质聚合物
C Maggetti1, D Pinelli1, E Girometti1
1Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum - University of Bologna, via Terracini 28, 40131, Bologna, Italy.
Chemosphere
|October 23, 2024
概括
一种新型的基甲K地质聚合物 (G13) 有效地从废水中去除和回收氨. 这种强大的离子交换过程产生高纯度的肥盐,能耗降低,支持循环经济.
科学领域:
- 环境工程 环境工程
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 从城市废水 (MWW) 中去除氨对于肥料生产和环境保护至关重要.
- 之前的离子交换研究往往忽视了工艺的稳定性和有效的氨回收.
- 开发从废水中回收营养的可持续方法符合循环经济原则.
研究的目的:
- 开发和评估一种连续流动的离子交换工艺,用于从MWW中去除和回收,使用一种基于甲K的地质聚合物 (G13).
- 通过多个吸附/脱附周期和不同的MWW类型来评估工艺的稳定性.
- 为了优化脱吸步骤,以高产率回收以可用于肥料的形式.
主要方法:
- 使用G13运行了7个连续的吸附/脱附周期,使用两种类型的MWW.
- 评估过程性能指标,包括运行能力,处理床体积和氨吸附产量.
- 研究了空床接触时间 (EBCT) 减少的影响,并使用托马斯模型模拟了吸附过程.
- 开发了一种创新的脱落过程,并分析了回收盐的组成.
- 与传统方法相比,计算的能源消耗和运营成本.
主要成果:
- 在7个循环中,G13表现出强大而稳定的性能,运行能力为12 mgN/gdry sorbent,吸附率为88-91%.
- 从10分钟减少到5分钟的EBCT没有影响性能,通过托马斯模型模拟验证.
- 溶解过程实现了高回收率 (86-100%),产生适用于肥料的KNO3 (54%w) 和NH4NO3 (39%w).
- 能源消耗明显低于化/脱化 (0.027千瓦时/处理的立方米WW),运营成本与基准过程相比.
结论:
- 基于甲K的地质聚合物G13是一种有希望的,强大的材料,可有效地从MWW中去除和回收.
- 开发的过程为营养回收提供了可持续的解决方案,有助于循环经济的废水处理方法.
- G13促进了有价值的肥盐的生产,减少了对合成肥料生产的依赖,并最大限度地减少了对环境的影响.
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