反渗透膜的清洗

系统地介绍了膜污染的原因、污染物种类及清洗、防治方法。     

反渗透膜污染及其清洗的研究

反渗透膜分离技术在水处理中的应用越来越广泛,膜污染也日益受到重视。就常见的膜污染情况进行研究,针对不同的污染情况提出了几种常用的清洗方式,并比较了几种清洗方式的优劣,重点揭示了化学清洗机理,为反渗透膜的清洗提供建议。     

反渗透膜的清洗

简要介绍反渗透装置在处理氯化铵废水过程中遇到的膜污染问题和化学清洗方法的确定,以及清洗后取得的良好效果。     

反渗透膜的清洗

文章介绍了反渗透装置在处理氯化铵废水过程中遇到的膜污染问朋和化学清洗方法的确定,以及清洗后取得良好的效果.     

反渗透膜污染分析及清洗研究

膜污染在膜运行过程中是不可避免的 ,造成膜污染的成因多种多样 ,非常复杂 ,膜清洗也就成为膜应用中的一个难题。在实践的基础上 ,经过多次试验 ,摸索出一套有针对性的高效的膜清洗技术 ,运行结果表明清洗成功     

反渗透膜的污染与清洗

对反渗透膜的污染原因、污垢种类及其危害进行了综述。准确判断膜清洗时机 ,针对不同的膜材质和不同类型的污垢 ,选用恰当的清洗剂 ,采用合理的清洗工艺 ,清除各类污垢 ,快速恢复膜通量     

某电厂反渗透膜系统的化学清洗

分析了某电厂反渗透系统装置运行参数的变化、反渗透膜污染物的主要组成,确定了清洗方案。通过清洗液浊度、清洗液pH、一二段压差变化等指标,确定清洗终点。该装置化学清洗后进水压力大幅降低,产水脱盐率达到设计要求,产品水的回收率基本达到设计值,取得满意的清洗效果。     

反渗透膜污染类型分析及清洗技术的研究进展

在反渗透技术中,膜污染是一种不可避免的问题,膜污染指的是水处理过程中膜表面或膜孔道被杂质、污垢或生物物质覆盖或堵塞的现象。膜污染的发生会导致许多不利影响,包括处理能力降低、脱盐率下降、回收率降低以及段间压差升高等,因此反渗透膜污染以及清洗技术显得至关重要。本文针对反渗透膜污染的类型进行分析,并从物理清洗、化学清洗以及清洗注意事项进行详细论述。最后,对反渗透膜及清洗技术未来发展方向进行展望,有利于结合具体情况选择适当的清洗剂和操作条件。通过正确的清洗和维护,可以延长反渗透膜的使用寿命,确保系统的稳定运行和长期经济效益。     

反渗透膜的化学清洗

介绍了膜污染的产生、特征及化学清洗的方法 ;通过实例阐明在反渗透脱盐系统中 ,膜的污染已成为反渗透系统长期稳定运行的最大障碍 ,需要有效实用的化学清洗技术以实现反渗透系统的长期稳定运行。防治膜污染是确保反渗透膜系统稳定运行的关键之一。     

反渗透膜的污染分析及其清洗

通过自制的平板膜对沧州炼油厂热电厂水处理车间反渗透设备的膜污染进行了研究。经电镜扫描与ＥＤＸ能谱分析,测出ＲＯ膜膜而Ｃ、Ｏ、Ｃａ和Ｓｉ等元素的分布情况,确定膜面上的主要污染物是胶体的污染物,微生物污染物以及一定量的ＳｉＯ２颗粒,其中胶体污染物的主要成分是Ｓｉ、Ａｌ、Ｆｅ和一定量的有机物。     

反渗透膜的铁污染与清洗

本文介绍了反渗透膜发生铁污染后性能的变化 ,阐明了铁污染的原因 ,并考查了清洗的效果     

含单宁酸模拟废水对反渗透膜的污染研究

通过改变单宁酸溶液浓度、pH值等参数以及与不同金属离子的协同反应,考察了单宁酸物质对反渗透膜的污染而引发的膜性能的变化过程。试验结果表明,单宁酸的质量浓度为50 mg/L的高浓度与4、10 mg/L的低浓度引发膜通量下降的规律不同;pH值越高,膜污染越慢;K+、Na+、Mg2+、Ca2+与单宁酸协同作用时产生的膜污染程度依次加剧,其中单宁酸溶液中存在Mg2+、Ca2+时的污染速率远大于K+、Na+。     

反渗透膜的污染及清洗

介绍了RO膜污染的类型及污染的形成,讨论了RO膜的清洗方法及配方。     

Seasonal fouling on seawater desalination RO membrane

A pilot study has been performed to investigate the seasonal characteristic of seawater reverse osmosis (RO) membrane fouling. Two batches of experiment during summer and winter were both performed 18 days to provide a clear picture on microbial population variability. The feed water of the pilot from seawater desalination plant has significant difference in temperature and silica content between the two seasons.In our experiments, scaling and biofouling are more serious in summer. And the permeate flux decline is closely related to the rise in microbial population, and it was dominated by cell multiplication rather than adhesion. In addition, the summer cell multiplication is much more abundant. Moreover, the extracellular polymeric substance (EPS) feature intensity detected by Fourier-transform infrared spectroscopy was also stronger in summer. The abundant EPS was one of the major reasons to cause the inorganic matter adsorption. Si, Al, Fe, Ca and Mg were found as the major inorganic foulants deposited on the Ro membranes. Silica and calcium in summer appeared obvious higher amounts than that in winter, which indicated that they should be affected by microbial action directly or indirectly more than other elements.In summary, there exists a seasonal effect on membrane scaling and fouling, and scaling is associated with biofouling in some degree. Further researches could be focus on actual association between microbial action and inorganic fouling.     

反渗透膜用于中水回用时的污染和化学清洗

介绍了反渗透膜用于中水回用时的污染原因及化学清洗过程,采用酸洗与碱洗相结合的清洗方式能够较好地恢复反渗透膜的性能。对于深度污染的膜,通过延长循环和浸泡时间,以及添加剥离分散剂能提高反渗透膜的通量。     

An assessment of the Silt Density Index based on RO membrane colloidal fouling experiments with iron oxide particles

RO membrane colloidal fouling experiments were performed in the laboratory under well controlled and realistic conditions. Iron oxide was selected as a typical inorganic colloidal foulant, due to its importance, as evidenced from well known manufacturer recommendations on iron concentrations in feed waters and from frequently encountered problems in membrane installations. A range of iron concentrations was identified where a linear relationship existed between flux reduction rate and concentration. The performance of the Silt Density Index (SDI) was tested on the basis of the RO fouling data obtained. The range of iron concentrations where measurable and meaningful SDI values could be obtained was remarkably close to membrane manufacturer recommendations. A notable sensitivity of the SDI was also observed with particles for which retention is negligible. However, on the basis of the RO fouling data obtained, it appears that the SDI is not conservative enough. Furthermore, since the SDI cannot predict fouling rates, it cannot discriminate between different types of membranes.     

反渗透膜清洗剂的实验评价方法

添加阻垢剂是反渗透系统重要的预处理方法之一,但膜在运行中还是会被反渗透过程中沉淀出的不溶性物质所逐渐污染.为了克服污染,必须对膜进行的定期清洗.反渗透市场上每年都会推出新的清洗剂,如何评价这些反渗透清洗剂及销售商提供的清洗程序至关重要.文章提供一种快速、方便、可靠的膜清洗剂试验方法.