投加粉末活性炭对超滤膜去除海水中有机物的影响
发布时间：2018-11-22 08:50
【摘要】：超滤膜的有机污染问题是膜法海水预处理技术在海水淡化工程应用面临的重要挑战,粉末活性炭吸附是目前常用的膜前预处理手段之一。本文对比分析了直接超滤和投加粉末活性炭后对海水中有机物的截留能力,利用三维荧光光谱分析了投加粉末活性炭对超滤膜截留有机物的影响机制,并考察了海水超滤过程中通量变化及膜污染情况。研究结果表明,投加粉末活性炭能够强化超滤膜对海水浊度和有机物的去除,当粉末活性炭投量为200mg/L时,整个系统对海水中DOC去除率从直接超滤时的55.1%提高到77.6%。利用粉末活性炭的吸附作用及其在超滤膜表面形成的疏松滤饼层能够显著提高超滤系统对海水中腐植酸类有机物的去除能力。与直接超滤相比,粉末活性炭-超滤系统对改善膜通量的作用有限,但粉末活性炭形成的滤饼层能够避免超滤膜与有机物直接接触,可显著减缓超滤膜的不可逆污染。
[Abstract]:The organic pollution of ultrafiltration membrane is an important challenge for the application of membrane seawater pretreatment technology in seawater desalination engineering. The adsorption of powdered activated carbon is one of the commonly used pre-membrane pretreatment methods. In this paper, the retention ability of organic matter in seawater after direct ultrafiltration and adding powdered activated carbon is compared and analyzed. The influence mechanism of adding powdered activated carbon on the retention of organic matter in ultrafiltration membrane is analyzed by using three dimensional fluorescence spectroscopy. The flux change and membrane fouling during ultrafiltration were investigated. The results show that adding powdered activated carbon can enhance the removal of turbidity and organic matter in seawater by ultrafiltration membrane. When the dosage of powdered activated carbon is 200mg/L, The removal rate of DOC in seawater increased from 55.1% in direct ultrafiltration to 77.6% in the whole system. The adsorption of powdered activated carbon and the loose cake layer formed on the surface of ultrafiltration membrane can significantly improve the removal capacity of humic acid organic compounds in seawater by ultrafiltration system. Compared with direct ultrafiltration, the effect of powder activated carbon-ultrafiltration system on improving membrane flux is limited, but the cake layer formed by powder activated carbon can avoid direct contact between ultrafiltration membrane and organic matter, and can significantly reduce the irreversible fouling of ultrafiltration membrane.
【作者单位】： 国家海洋局天津海水淡化与综合利用研究所;
【基金】：中央级公益性科研院所基本科研业务费专项资金项目(K-JBYWF-2015-T10) 海洋公益性行业科研专项项目(201405035)
【分类号】：P747
，
本文编号：2348753
[Abstract]:The organic pollution of ultrafiltration membrane is an important challenge for the application of membrane seawater pretreatment technology in seawater desalination engineering. The adsorption of powdered activated carbon is one of the commonly used pre-membrane pretreatment methods. In this paper, the retention ability of organic matter in seawater after direct ultrafiltration and adding powdered activated carbon is compared and analyzed. The influence mechanism of adding powdered activated carbon on the retention of organic matter in ultrafiltration membrane is analyzed by using three dimensional fluorescence spectroscopy. The flux change and membrane fouling during ultrafiltration were investigated. The results show that adding powdered activated carbon can enhance the removal of turbidity and organic matter in seawater by ultrafiltration membrane. When the dosage of powdered activated carbon is 200mg/L, The removal rate of DOC in seawater increased from 55.1% in direct ultrafiltration to 77.6% in the whole system. The adsorption of powdered activated carbon and the loose cake layer formed on the surface of ultrafiltration membrane can significantly improve the removal capacity of humic acid organic compounds in seawater by ultrafiltration system. Compared with direct ultrafiltration, the effect of powder activated carbon-ultrafiltration system on improving membrane flux is limited, but the cake layer formed by powder activated carbon can avoid direct contact between ultrafiltration membrane and organic matter, and can significantly reduce the irreversible fouling of ultrafiltration membrane.
【作者单位】： 国家海洋局天津海水淡化与综合利用研究所;
【基金】：中央级公益性科研院所基本科研业务费专项资金项目(K-JBYWF-2015-T10) 海洋公益性行业科研专项项目(201405035)
【分类号】：P747
，
本文编号：2348753
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