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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
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在双极膜电透析中通过通过电流脉冲调节来控制pH值来恢复氨
Iosif Kaniadakis1, Jules B van Lier1, Henri Spanjers1
1Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, Delft 2628 CN, the Netherlands.
Water research
|July 12, 2025
概括
这项研究引入了一种用于双极膜电透析的新型pH控制方法,显著降低了能源消耗,提高了氨回收效率. 这项创新增强了废水中的营养回收,并最大限度地减少了缩放问题.
科学领域:
- 环境工程 环境工程
- 化学工程是化学工程的重要组成部分.
- 水处理技术水处理技术
背景情况:
- 双极膜电透析 (BPM) 对水解离的控制操作有限,阻碍了营养恢复应用.
- 在基溶液中的现场pH控制可以提高从废水中提取氨 (NH3) 的能源效率.
研究的目的:
- 开发和评估双极膜电透析 (BPMC) 的现场pH控制方法,以提高能源效率和氨回收.
- 在能源消耗,电流效率和扩展方面,比较开发的pH控制方法与恒流 (CC) 操作的性能.
主要方法:
- 实施了使用脉冲电流的pH控制策略,在一个双极膜电透析 (BPMC) 系统中采用双隔间,并结合选择性电透析逆转 (SEDR) 和真空膜剥离 (VMS).
- 运行BPMC系统以回收氨离子 (NH4+) 并将其从无氧消化过程中转化为挥发性氨 (NH3),拒绝水.
- 在pH控制下监测和比较了能源消耗,电流效率,去除效率和缩放形成,而不是CC操作.
主要成果:
- 与CC操作相比,pH控制方法显著降低了能源消耗 (12.535.3 MJ·kgN−1).与CC操作相比 (12.178.6 MJ·kgN−1).
- 在pH控制下,电流效率保持在2529%,而在高电流密度的CC运行下,它从27%下降到12%.
- 脉冲电流减少了缩放和二氧化碳的形成,并消除了对外部腐蚀剂量的需求,减少了杂质.
结论:
- 开发的现场pH控制方法通过控制水分离来降低能源消耗,为规模化应用提供了明显的改进.
- 这种方法提高了氨回收效率,并通过替代化学剂量来降低运营成本和环境影响.
- pH控制策略提供了稳定的运行和更好的性能,使其成为营养恢复技术的有希望的进步.
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