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温度对海水微絮凝-超滤工艺的影响

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赵瑾, 王文华, 曹军瑞, 姜天翔, 王勋亮. 温度对海水微絮凝-超滤工艺的影响[J]. 环境化学, 2018, 37(12): 2740-2748. doi: 10.7524/j.issn.0254-6108.2018012502
引用本文: 赵瑾, 王文华, 曹军瑞, 姜天翔, 王勋亮. 温度对海水微絮凝-超滤工艺的影响[J]. 环境化学, 2018, 37(12): 2740-2748. doi: 10.7524/j.issn.0254-6108.2018012502
shu
ZHAO Jin, WANG Wenhua, CAO Junrui, JIANG Tianxiang, WANG Xunliang. Influence of temperature on seawater micro-flocculation-ultrafiltration process[J]. Environmental Chemistry, 2018, 37(12): 2740-2748. doi: 10.7524/j.issn.0254-6108.2018012502
Citation: ZHAO Jin, WANG Wenhua, CAO Junrui, JIANG Tianxiang, WANG Xunliang. Influence of temperature on seawater micro-flocculation-ultrafiltration process[J]. Environmental Chemistry, 2018, 37(12): 2740-2748. doi: 10.7524/j.issn.0254-6108.2018012502
shu

温度对海水微絮凝-超滤工艺的影响

  • 1.

    国家海洋局天津海水淡化与综合利用研究所, 天津, 300192

  • 基金项目:

    中央级公益性科研院所基本科研业务费专项资金（K-JBYWF-2015-T10，K-JBYWF-2017-G15）资助.

Influence of temperature on seawater micro-flocculation-ultrafiltration process

  • 1.

    Institute of Seawater Desalination and Multipurpose Utilization, Tianjin, 300192, China

  • Fund Project: Supported by the Central Research Institutes of Basic Research and Public Service Special Operations (K-JBYWF-2015-T10, K-JBYWF-2017-G15).

  • 摘要: 采用微絮凝-超滤工艺处理不同温度的海水，研究了温度对有机物的去除效果、絮体特性以及超滤膜通量的影响规律.以三氯化铁为絮凝剂，分析了微絮凝-超滤对海水UV254、DOC及三维荧光光谱的影响，监测了不同海水温度下微絮凝过程中产生絮体的絮凝指数、分形维数等特性，考察了微絮凝对超滤膜污染的减缓作用.实验结果表明，当FeCl3投加量为1.0 mg·L-1时，对5℃、10℃、15℃、20℃海水的UV254去除率分别为84.4%、81.3%、78.1%、71.9%，DOC去除率分别为81.8%、75.8%、65.0%、57.5%，微絮凝-超滤工艺对低温海水的去除效果优于常温海水，可去除海水中的芳香族蛋白类和腐殖酸类有机物；温度对絮凝指数FI的影响较小，说明其不同温度下微絮凝形成的絮体粒径变化不大；但低温海水形成的絮体分形维数要小于常温海水，说明低温海水的絮体结构更加疏松，疏松的絮体结构更有利于减缓后续超滤膜通量的下降.
    Abstract: Combined process of micro-flocculation and ultrafiltration was applied in the purification of seawater, and ferric trichloride was used as a flocculent. The influences of temperature on the removal efficiencies of organic matters, floc characteristics and flux of the ultrafiltration membrane were investigated. The UV254,DOC and three-dimesional fluorescence spectroscopy of seawater were analyzed. And the flocculation index parameters and fractal dimension at different temperatures were monitored during the micro-flocculation process, and their effects on mitigating membrane fouling were also investigated. Experimental results demonstrated the removal efficiency of UV254 ranged from 71.9% to 84.4%, and DOC ranged from 57.5% to 81.8% at different temperatures when the dosage of ferric trichloride was 1.0 mg·L-1, respectively. As a result, low temperatures were beneficial in achieving higher removal efficiencies of organic matters. Aromatic proteins and humic acids were removed by micro-flocculation. The particle sizes of flocs at different temperatures were similar, since the influence of temperature on the flocculation index formed by micro-flocculation was insignificant. But the flocs formed at lower temperatures had more loose interior structures and smaller fractal dimension, which were beneficial to the mitigation of membrane fouling.
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  • 收稿日期:  2018-01-25
  • 刊出日期:  2018-12-15
赵瑾, 王文华, 曹军瑞, 姜天翔, 王勋亮. 温度对海水微絮凝-超滤工艺的影响[J]. 环境化学, 2018, 37(12): 2740-2748. doi: 10.7524/j.issn.0254-6108.2018012502
引用本文: 赵瑾, 王文华, 曹军瑞, 姜天翔, 王勋亮. 温度对海水微絮凝-超滤工艺的影响[J]. 环境化学, 2018, 37(12): 2740-2748. doi: 10.7524/j.issn.0254-6108.2018012502
shu
ZHAO Jin, WANG Wenhua, CAO Junrui, JIANG Tianxiang, WANG Xunliang. Influence of temperature on seawater micro-flocculation-ultrafiltration process[J]. Environmental Chemistry, 2018, 37(12): 2740-2748. doi: 10.7524/j.issn.0254-6108.2018012502
Citation: ZHAO Jin, WANG Wenhua, CAO Junrui, JIANG Tianxiang, WANG Xunliang. Influence of temperature on seawater micro-flocculation-ultrafiltration process[J]. Environmental Chemistry, 2018, 37(12): 2740-2748. doi: 10.7524/j.issn.0254-6108.2018012502
shu

温度对海水微絮凝-超滤工艺的影响

  • 1. 国家海洋局天津海水淡化与综合利用研究所, 天津, 300192
  • 收稿日期:  2018-01-25
基金项目:

中央级公益性科研院所基本科研业务费专项资金（K-JBYWF-2015-T10，K-JBYWF-2017-G15）资助.

摘要: 采用微絮凝-超滤工艺处理不同温度的海水，研究了温度对有机物的去除效果、絮体特性以及超滤膜通量的影响规律.以三氯化铁为絮凝剂，分析了微絮凝-超滤对海水UV254、DOC及三维荧光光谱的影响，监测了不同海水温度下微絮凝过程中产生絮体的絮凝指数、分形维数等特性，考察了微絮凝对超滤膜污染的减缓作用.实验结果表明，当FeCl3投加量为1.0 mg·L-1时，对5℃、10℃、15℃、20℃海水的UV254去除率分别为84.4%、81.3%、78.1%、71.9%，DOC去除率分别为81.8%、75.8%、65.0%、57.5%，微絮凝-超滤工艺对低温海水的去除效果优于常温海水，可去除海水中的芳香族蛋白类和腐殖酸类有机物；温度对絮凝指数FI的影响较小，说明其不同温度下微絮凝形成的絮体粒径变化不大；但低温海水形成的絮体分形维数要小于常温海水，说明低温海水的絮体结构更加疏松，疏松的絮体结构更有利于减缓后续超滤膜通量的下降.

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