宽流道反渗透膜元件抗污染性能分析

doi:10.11949/j.issn.0438-1157.20181257

摘要/Abstract

摘要：

以活性蓝MB-R和硫酸钠模拟高盐染色废水，分析了宽流道反渗透膜组件的抗污染性能，对比研究了不同流道宽度和膜内隔网定向角度变化对于膜组件抗污染性能及运行能耗的影响。实验结果表明，适当增加流道宽度可以有效减缓膜通量衰减速率，延长膜运行时间，但流道宽度增加到一定程度后膜组件抗污染性能不再随流道宽度增加而有明显改善。进水隔网定向角度对膜组件抗污染性能影响非常明显。实验结果表明，在流道宽度不变前提下，进水隔网定向角度从40°变成45°时165 min内膜通量衰减速率下降3.9%，一个低压冲洗周期内的膜运行时间延长了35.7%，低压冲洗后膜通量恢复率提高了4.5%。综合trade-off效应和进水压降分析，与普通反渗透组件相比，当宽流道组件的进水流道宽度达到30 mil（1 mil=0.025 mm），隔网定向45°时具有更优越的抗污染性能和更低的运行能耗。

关键词: 反渗透膜组件, 宽流道, 隔网定向, 膜污染, 优化设计

Abstract:

The high-salt dyeing wastewater was simulated by reactire blue MB-R and sodium sulfate. The effects of different channel height and spacer orientation on the anti-fouling performance and energy consumption of RO membrane modules were compared. The results showed that the membrane flux decline could be slowed down and the membrane running time could be prolonged by increasing the spacer thickness appropriately. However, the anti-fouling performance of the membrane module could not be improved significantly with the increase of the spacer thickness when the spacer thickness was increased to a certain extent. On the other hand, the influence of spacer orientation on the anti-fouling performance of membrane module was very obvious. The results suggested that when the spacer thickness remained unchanged and the spacer orientation changed from 40° to 45°, the membrane flux decline rate decreased by 3.9% after 165 min of operation, the filtration time of one low pressure flushing cycle was prolonged by 35.7%, and the flux recovery rate was increased by 4.5% after the low pressure flushing. The comprehensive analysis based on the trade-off effects and the feed channel pressure drops indicated that a better anti-fouling performance and lower operation energy consumption can be obtained when the feed channel height was set at 30 mil and the spacer orientation was set at 45°.

Key words: reverse osmosis membrane modules, wider spacer, spacer orientation, membrane fouling, optimal design

中图分类号:

TQ 028.8

吴降麟, 张朝晖, 王亮, 赵斌, 李腾飞, 陈萌萌. 宽流道反渗透膜元件抗污染性能分析[J]. 化工学报, 2019, 70(4): 1446-1454.

Jianglin WU, Zhaohui ZHANG, Liang WANG, Bin ZHAO, Tengfei LI, Mengmeng CHEN. Analysis of anti-fouling performance of wider spacer RO membrane module[J]. CIESC Journal, 2019, 70(4): 1446-1454.

图/表 11

表1 反渗透膜组件参数

Table 1 Parameters of reverse osmosis membrane module

Sample	Membrane module type	Channel width/mil	Spacer orientation	Membrane material	Membrane area/m²	Rejection rate of Na₂SO₄	Pure water flux/(L/(m²·h))
20 mil-40°	LE-2521	20	40°	polyamide	1.3935	≥99%	≥50
30 mil-40°	LE-2521	30	40°	polyamide	1.3935	≥99%	≥50
40 mil-40°	LE-2521	40	40°	polyamide	1.3935	≥99%	≥50
40 mil-45°	LE-2521	40	45°	polyamide	1.3935	≥99%	≥50

图1 实验装置和实物照片

Fig.1 Schematic diagram of experimental device and physical diagram

图2 不同反渗透组件的膜比通量衰减曲线

Fig.2 Membrane specific flux decay curves of different reverse osmosis modules(operation pressure 1.5 MPa; active blue concentration 200 mg/L; conductivity 8.32 mS/cm; recovery rate 20%)

图3 低压冲洗前后膜通量变化曲线

Fig.3 Variation of membrane flux before and after low pressure flushing(operation pressure 1.5 MPa; active blue concentration 200 mg/L; conductivity 8.32 mS/cm; recovery rate 20%)

图4 进水水质对膜性能的影响

Fig.4 Effect of influent water quality on membrane performance(operation pressure 1.5 MPa; active blue concentration 0.2—200 mg/L; conductivity 0.112—8.32 mS/cm; recovery rate 20%)

图5 脱盐率-回收率关系曲线

Fig.5 Relation curve of desalination rate and recovery rate(operation pressure 1.5 MPa; active blue concentration 200 mg/L; conductivity 8.32 mS/cm; recovery rate 20%)

图6 不同规格反渗透膜trade-off图

Fig.6 Trade-off diagram of reverse osmosis membrane with different specifications(operation pressure 1.5 MPa; active blue concentration 200 mg/L; conductivity 8.32 mS/cm; recovery rate 10%—60%)

图7 反渗透膜组件运行压力随产水通量增长的变化规律

Fig.7 Variation of operation pressure of reverse osmosis membrane module with water flux growth(operation pressure 1.5 MPa; active blue concentration 200 mg/L; conductivity 8.32 mS/cm; recovery rate 20%)

图8 实验所用三种流道宽度反渗透膜剖面

Fig.8 Sketch map of three channel width reverse osmosis membrane used in experiment

图9 膜内进水隔网照片

Fig.9 Photos of water inflow spacer inside membrane

图10 膜内进水隔网定向角度

Fig.10 Orientation angle of water inlet spacer in membrane

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