反透与中间化学去矿化:尺度抑制剂选择,降解和播种沉
Shichang Xu1, Ping Wang1, Lixin Xie1
1Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
Molecules (Basel, Switzerland)
|May 25, 2024
概括
这项研究引入了一种两阶段的反透 (RO) 工艺,其中有中间缩物去矿化,用于处理高硫酸盐水. 结合UV/H2O2和石膏种植的降水策略有效地去除缩抑制剂和硫酸,增加水的回收.
科学领域:
- 环境工程 环境工程
- 水处理技术水处理技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- 来自反透 (RO) 工艺的盐水缩物,特别是那些含有高硫酸 (CaSO4) 的盐水缩物,对处理和水回收提出了挑战.
- 当前的RO系统在处理这种盐水时,往往难以缩放和有限的水回收率.
- 中间缩去矿化 (ICD) 为管理高CaSO4盐水提供了一个潜在的解决方案.
研究的目的:
- 研究一种两阶段的RO工艺,其中包括中间缩物去矿化 (ICD),以有效处理富含CaSO4的盐水.
- 为了优化CaSO4缩抑制剂和矿物本身的去除,以提高水回收率.
- 评估联合紫外线/H2O2处理和石膏种子沉 (GSP) 策略的有效性.
主要方法:
- 选择和测试尺度抑制剂,其中RO-400被确定为高达6的石膏和指数 (SIg) 的有效剂.
- 在优化条件下 (40W UV,70 mg/L H2O2) 使用UV/H2O2处理降解度抑制剂RO-400.
- 通过使用重复使用的石膏种子通过种子沉脱,实现高CaSO4反应度 (97.12%) 和低SIg (1.07).
主要成果:
- 优化的UV/H2O2处理在15分钟内完全降解了RO-400,防止了膜缩放.
- 种子沉有效地去除了97.12%的CaSO4,将度的SIg降低到1.07,适合循环淡化.
- 经过三次UV/H2O2和GSP (UVD-GSP) 试验,证明了重复使用的石膏种子在保持降水性能方面的有效性.
结论:
- 使用ICD开发的两阶段RO工艺,采用UVD-GSP联合策略,显著提高了含有CaSO4的盐水的水回收率.
- 这种方法有效地管理了缩抑制剂降解和CaSO4沉,从而实现了高效的循环淡化.
- 该研究提供了一种可行的和可扩展的方法来处理具有挑战性的盐水,减少缩物排放和最大限度地利用水资源.
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