共查询到19条相似文献,搜索用时 141 毫秒
1.
2.
3.
4.
5.
膜污染是膜技术应用中面临的关键问题,其影响膜运行的稳定性,决定膜清洗周期以及膜的更换频率。因此,要使膜获得长期稳定的运行效果,必须研究其膜污染的机理与清洗方法。确定了膜污染机理,对于了解膜通量下降原因、预测膜通量、控制和消除膜污染具有指导意义。膜面形成污染层,会影响通量以及脱盐率,因此需定期进行膜清洗以恢复性能,但也有不可恢复的损失,造成运行成本提高。故文中总结了膜清洗的方式与污染机理以望对膜行业的发展有所促进作用。 相似文献
6.
7.
8.
9.
采用阳极氧化铝膜过滤牛血清蛋白溶液,考察了孔径20、100、200 nm 3种膜的过滤通量随时间的变化关系,在相同的操作条件下孔径20 nm的膜具有较高的渗透通量(400 L/(m2.h))和较小的过滤阻力(8.3×1011/m)。还考察了蛋白质浓度、泵送时间及清洗对膜污染情况的影响。结果表明,在实验的范围和条件下,随蛋白质浓度的增大,膜污染加重,稳定通量增大;泵送时间增长,膜污染速度加快,通量增大;通过纯水清洗加超声清洗的方法去除可逆污染,清洗后膜与新膜过滤通量相当。 相似文献
10.
MBR膜的污染及其清洗技术研究进展 总被引:8,自引:0,他引:8
针对环境污染控制中广泛应用的膜生物反应器(MBR),阐述了其污染的主要来源和影响因素,重点介绍了膜清洗的几种方法及发展状况,并提出了膜清洗技术的发展方向。 相似文献
11.
12.
反渗透膜有机污染的研究进展 总被引:1,自引:0,他引:1
介绍了反渗透进水中一些主要有机污染物质的污染机理以及操作条件、膜自身特性、溶液化学性质对于污染过程的影响,还综述了预处理技术、清洗方法以及通过膜的表面改性等措施来控制反渗透膜的有机污染,最后指出了目前研究中需关注的一些问题。 相似文献
13.
14.
15.
16.
Chemical cleaning of reverse osmosis membranes used for treating wastewater from a rolling mill process 总被引:1,自引:0,他引:1
Yong-Jun Jung Yoshiaki Kiso Toshiro Yamada Toshiyuki Shibata Tae-Gwan Lee 《Desalination》2006,190(1-3):181-188
An analysis of fouling material and the effects of chemical cleaning were examined for a reverse osmosis (RO) membrane, which was used for the treatment of wastewater from a rolling mill process in the steel industry. The bulk foulant accumulated in the membrane module consisted mainly of CaSO4·2H2O, and the organic contaminants were contained at a very low level. The test pieces obtained from the exhausted RO membrane module (spiral-wound type) were used to examine chemical cleaning with the following solutions: acid and alkaline solutions with EDTA added, 50% methanol, and 10% ethyleneglycol monobutyrate (EGMB). Although a major component of the fouling material was calcium salt, the acid or alkaline solution containing EDTA did not promote the effective recovery of the water flux. On the other hand, cleaning with 50% methanol or 10% EGME solution increased the water flux significantly. The atomic force microscopy images of the membrane surface indicated that relatively large particles accumulated at the surface of the fouled membranes, and the large particles remained even after acid or alkaline cleaning. In the case of EGMB cleaning after alkaline cleaning, large particles did not remain, and uniform and fine particles were observed. The results that calcium salt, a major fouling material, was not removed effectively with the acid and alkaline solution may be due to trace organic materials in the fouling layer that act as a binder for inorganic fouling materials. 相似文献
17.
18.
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 相似文献