对空心纤维膜蒸模块中污染的分析,用于海水淡化,盐减少
Hyeongrak Cho1, Seoyeon Lee1, Yongjun Choi1
1School of Civil and Environmental Engineering, Kookimin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, Republic of Korea.
Membranes
|December 24, 2025
概括
膜蒸 (MD) 有效地缩盐水,但长期运行会导致污染. 无机,主要是碳酸,通过影响膜性质并导致湿,降低性能.
科学领域:
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
背景情况:
- 膜蒸 (MD) 对于从海水淡化中缩高盐至关重要.
- 在MD系统中的长期污染行为仍然不太了解,这阻碍了可靠的应用.
- 直接接触膜蒸 (DCMD) 是盐水管理的一个关键配置.
研究的目的:
- 研究空心纤维MD模块中的污染机制和空间分布.
- 分析长期使用真实海水淡化盐水对MD性能的影响.
- 确定污染物的类型及其对性能下降的贡献.
主要方法:
- 120天运行后使用真实海水淡化盐水对空腔纤维MD模块进行解剖.
- 性能监测包括流量,透性和盐排斥.
- 使用SEM,EDS,ICP-OES和FT-IR进行操作后分析,以描述污染物.
主要成果:
- 保持稳定的盐排斥 (>99%),但流量和透性逐渐下降.
- 主要的污染物被确定为无机,主要是碳酸 (CaCO3),SiO2,Fe和有机物作为次要贡献者.
- 由于温度和度极化加剧,模块入口的污染最严重,促进了层沉积.
- 观察到膜疏水性降低和液体进入压力降低,导致部分湿和性能恶化.
结论:
- 用真盐水长期运行DCMD会导致大量污染,主要是无机层沉积.
- 空间污染变化是由模块内的水力动力学和热力学条件驱动的.
- 有效的污染缓解策略和水力动力学优化对于可持续的MD盐水度至关重要.
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