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首页> 外文期刊>Separation and Purification Technology >Nanofiltration of Cleaning-in-Place (CIP) wastewater in a detergent plant: Effects of pH, temperature and transmembrane pressure on flux behavior
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Nanofiltration of Cleaning-in-Place (CIP) wastewater in a detergent plant: Effects of pH, temperature and transmembrane pressure on flux behavior

机译：洗涤剂厂中就地清洗（CIP）废水的纳滤：pH，温度和跨膜压力对通量行为的影响

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摘要

In this study, product recovery and process water recycling in a model Cleaning-in-Place (CIP) wastewater containing anionic and nonionic surfactants, dye, and salt generated from the production of a liquid dishwasher detergent was investigated using a two-step nanofiltration (NF) process. In the first step, a loose NF membrane was used for product recovery, especially surfactants and dye. Effects of pH (3, 5, 7, and 10), temperature (25 and 40 °C), and transmembrane pressure (8,12,16, and 20 bar) on the membrane performance were evaluated. The best results were obtained at pH 5,25 °C, and 20 bar which provided the highest levels of both recovery and rejection of surfactants, dye, and salt. In the second step, the quality of permeate obtained from the loose NF membrane under the conditions providing the best performance was improved using a tight NF membrane. Even better rejections were achieved from the experiments with this NF membrane. Experimental results showed that recovery of surfactants and dye was achieved for re-using in the production of liquid dishwasher detergent, and the permeate was obtained in much the same quality of the water used in the first step of the CIP system using the loose membrane and tight membrane, respectively. In addition, the flux decline caused by the concentration polarization and fouling was evaluated for both membranes. Fouling on the surface of membranes was characterized with atomic force microscopy (AFM) and contact angle measurements.
机译：在这项研究中，使用两步纳滤技术研究了在原位清洗（CIP）废水中的产品回收和工艺用水再循环，该废水包含阴离子和非离子表面活性剂，染料和液体洗碗机洗涤剂生产中产生的盐分。 NF）过程。第一步，使用疏松的NF膜回收产品，尤其是表面活性剂和染料。评估了pH（3、5、7和10），温度（25和40°C）和跨膜压力（8、12、16和20 bar）对膜性能的影响。在pH 5.25°C和20 bar下获得了最佳结果，这提供了最高水平的表面活性剂，染料和盐的回收率和截留率。第二步，使用紧密的NF膜改善了在提供最佳性能的条件下从松散的NF膜获得的渗透液的质量。使用这种NF膜的实验获得了更好的剔除率。实验结果表明，回收表面活性剂和染料可重复用于生产液体洗碗机用洗涤剂，并且渗透液的质量与CIP系统第一步使用的松散膜和水的质量基本相同。紧膜。另外，对两种膜均评估了由浓度极化和结垢引起的通量下降。通过原子力显微镜（AFM）和接触角测量来表征膜表面的结垢。

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