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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >An innovative backwash cleaning technique for NF membrane in groundwater desalination: Fouling reversibility and cleaning without chemical detergent
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An innovative backwash cleaning technique for NF membrane in groundwater desalination: Fouling reversibility and cleaning without chemical detergent

机译：NF膜在地下水脱盐中的创新反冲洗技术：污垢可逆性和无需化学清洁剂即可清洁

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摘要

Membrane fouling is the main problem during the nanofiltration (NF) process of brackish water desalination due to the existence of natural organic matter, especially humic acid (HA). Moreover, the conventional membrane cleaning method would do great harm to the environment because large amount of chemicals were employed. In order to control organic fouling, a novel cleaning method via direct osmosis backwash (DOBW) by injecting high salinity (HS) solution was developed. Different operating conditions for HS-DOBW technology in the actual process were systematically investigated. The results demonstrated that there was a strong driving force to lift and sweep the foulants from the membrane surface which would be carried over to the brine. The optimal conditions in terms of HS (150 kg/m(3) NaCl solution) flow rate of 0.121 L/min were selected for the subsequent experiments. The results showed that the fouling could be almost fully reversible (more than 99.78% permeate water flux recovery), and the membrane needed to be cleaned for about 10 min because of the appearance of HA on membrane surface at the fouling time of 24 h. Most importantly, the HS-DOBW technology is very effective in keeping the membrane continuously clean and ensuring stable permeate production. (C) 2014 Elsevier B.V. All rights reserved.
机译：膜结垢是苦咸水脱盐的纳滤（NF）过程中的主要问题，这是由于存在天然有机物质，尤其是腐殖酸（HA）所致。而且，由于使用了大量的化学药品，常规的膜清洁方法会对环境造成极大的危害。为了控制有机污垢，开发了一种通过注入高盐度（HS）溶液通过直接渗透反洗（DOBW）的新颖清洁方法。系统研究了HS-DOBW技术在实际过程中的不同运行条件。结果表明，有很强的驱动力可以将污垢从膜表面提起并清除掉，然后将污垢带到盐水中。选择HS（150 kg / m（3）NaCl溶液）流速为0.121 L / min的最佳条件用于后续实验。结果表明，结垢几乎是完全可逆的（渗透水通量回收率超过99.78％），并且由于在24 h结垢时间HA出现在膜表面，因此膜需要清洁约10分钟。最重要的是，HS-DOBW技术在保持膜连续清洁并确保稳定的渗透液生产方面非常有效。 （C）2014 Elsevier B.V.保留所有权利。

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