膜分离技术的现状及其在染料化工中的应用研究

本文简单的叙述了膜分离技术的现状及我国的反渗透、纳滤、超滤、微滤技术的进展及其在染料化工中的应用研究。     

膜分离技术的现状及其在染料化工中的应用研究

本文简单的叙述了膜分离技术的现状及我国的反渗透、纳滤、超滤、微滤技术的进展及其在染料化工中的应用研究。     

膜分离法在含油废水处理中的应用

含油废水对生态环境造成严重污染。膜分离作为一种能耗低、设备简单、操作方便和分离性能好的技术,在含油废水处理中显示出广阔的应用前景。本文主要介绍了含油废水的特征及其处理方法,分析了微滤、超滤和反渗透等膜分离技术的特点及它们在含油废水中的应用。     

膜分离技术的现状及其在染料化工中的应用

叙述了膜分离技术的现状及我国反渗透、纳滤、超滤、微滤技术的进展 ,并介绍了膜分离技术在染料化工中的应用     

膜分离技术原理及在水处理行业中的应用

介绍了近年来新型材料即膜分离设备的工艺技术特点、应用范围及其分离介质类型。详细、准确阐述了超滤膜、微滤膜、纳滤膜、反渗透膜、电渗析膜等设备的工作原理、技术特点和应用范围。     

膜分离技术在中药制备中的应用

综述了膜分离技术在中药注射剂、口服液、浸膏、以及在有效成分提取生产的精制纯化过程中的应用情况。     

膜分离技术在环保中的应用

膜分离技术作为一种能耗低、设备简单、操作方便和分离性能好的分离技术,正日益受到广泛的关注.本文简单介绍了微滤、超滤、纳滤和反渗透等膜分离技术的基本原理,并介绍了膜技术在含油废水、重金属废水、造纸废水、食品工业废水和电泳涂漆废水处理中的应用研究进展状况.     

膜分离技术在中药提取分离中的应用

概括膜分离技术在中药提取中的应用。方法:查阅文献,对膜分离技术的原理、分类与特点进行阐述,及其在中药有效成分提取分离、中药制剂生产等方面的应用进行综述。结果:膜分离技术(微滤、超滤、纳滤、反渗透)在中药提取现代化进程中发挥重大作用,促进中药的现代化生产。     

膜分离技术在印染废水回用中的研究和应用

膜分离是一种新兴的集高效分离、浓缩、提纯和净化于一体的技术,目前在印染废水深度处理和回用中得到越来越广泛的应用.通过介绍了反渗透、纳滤、微滤和超滤的工作原理,论述了不同学者的研究成果和不同的膜分离组合工艺在印染废水回用中的应用.     

乳品废水处理中膜技术的应用研究

采用膜分离技术对乳品废水进行处理。首先对乳品废水进行预处理,再采用微滤膜、纳滤膜和反渗透膜对其进行过滤。结果表明,采用N130型微滤膜、S30型纳滤膜和RO反渗透膜组合时,不仅可以回收乳品废水中的糖类和蛋白质,还可实现乳品废水的清洁生产和循环利用。该处理方法简单、节能,可为工业化处理乳品废水提供参考。     

膜技术在荷叶黄酮分离纯化中应用

运用膜技术对荷叶黄酮提取液进行纯化.实验分别采用微滤膜和超滤膜对荷叶黄酮提取液进行初步纯化,研究表明孔径为50 nm的微滤膜Ⅱ对荷叶黄酮提取液有较好的除杂效果,黄酮透过率为97.4％,平均通量为186.7 L×h-1×m-2,且运行稳定;采用纳滤膜和反渗透膜对微滤膜的滤液进行浓缩,研究表明,纳滤膜在浓缩过程中能去除部分盐分等小分子物质,进一步纯化了黄酮溶液,纳滤膜平均通量为32.8L×h-1×m-2,透过率0％.     

膜分离技术的研究与应用

随着环境问题的日益严峻,国家对水资源更加重视,膜分离技术开始广泛应用于各个方面,作为膜分离技术的核心部件分离膜,其需求量也越来越大。文中阐述了膜分离技术的基本原理和膜技术核心部件膜的分类,介绍了膜分离技术在给水工程、工业废水、医药行业、食品行业、能源行业等方面的应用,对未来膜及其分离技术的发展进行了展望。     

压力驱动膜过程在饮用水处理中的应用

膜分离过程是一种选择性高、操作简单、能耗低、无二次污染的物理分离技术 ,近三十年来发展迅速 ,已在各个领域得到了广泛应用。本文综合介绍了国外压力驱动膜过程在饮用水处理中的应用情况     

膜分离技术在染料行业中的应用

本文简单介绍了膜的种类及其特点,重点综述了目前国内外膜分离技术在染料生产及印染废水处理中的应用情况。     

膜分离技术在重金属废水处理中的应用

综述了电渗析、液膜、纳滤、超低压反渗透、胶束增强超滤和水溶性聚合物络合超滤等膜技术在废水处理中的研究和应用概况，分析了膜技术在处理重金属废水中存在的主要问题，并对膜技术处理重金属废水的发展前景作了展望。     

Treatment of Leather Plant Effluent by Membrane Separation Processes

Abstract

A scheme is proposed for the treatment of the leather plant effluent using membrane based separation processes. The effluent coming out from the various upstream units of the leather plant (except chrome tanning) are combined and a two step pressure driven membrane processes involving nanofiltration (NF) and reverse osmosis (RO) are adopted after a pretreatment consisting of gravity settling, coagulation, and cloth filtration. The entire membrane separation scheme is validated by conducting experiments under a continuous cross flow mode. A detailed parametric study for cross flow experiments is investigated to observe the effects of the operating conditions, i.e., the transmembrane pressure drop and the cross flow velocity on the permeate flux and quality for both NF and RO. Using a combination of osmotic pressure and solution diffusion model for both NF and RO, the effective osmotic pressure coefficient, solute diffusivity, and the solute permeability through the membrane are obtained by optimizing the experimental permeate flux and concentration (in terms of total dissolved solids) values for this complex industrial effluent. The BOD and COD values of the finally treated effluent are well within the permissible limits (in India).     

Purification and Concentration of Caustic Mercerization Wastewater by Membrane Processes and Evaporation for Reuse

A membrane-based treatment strategy was developed for purifying the highly alkaline textile mercerization wastewater. 0.2-μm MF and 100 kDa UF membranes were evaluated as pretreatment alternatives before 10 kDa UF and 200 Da NF membranes. Turbidity was almost totally removed by both pretreatment options, while UF (100 kDa) showed higher COD retention than MF. In total recycle mode of filtration, fouling of both UF and MF membranes were 80% reversible by physical and almost totally reversible (≥ 97%) by chemical cleaning. In the second stage filtrations applied to the pretreated wastewater samples, NF could yield high (97-98%) COD retentions and low permeate COD concentrations (≤ 22 mg/L), while 10 kDa UF could only reduce the COD concentration to 150 mg/L. While no NaOH was lost in the MF+UF process, the use of NF as second stage resulted in 12-17% NaOH retention. The permeate flux in all second stage processes were stable, implying that the majority of the feed components that would cause fouling had been removed in the pretreatment stages. Permeate of the MF+NF sequence was concentrated by evaporation with no foaming problems, showing that the hybrid process can be applied to recycle a purified and concentrated caustic stream to the mercerization process.     

Separation of Small Organic Compounds Derived from Aldol-Condensation by Membrane Processes

The separation of C₃-carbohydrates (DL-glyceraldehyde and dihydroxyacetone) present after the aldol-condensation of formaldehyde and glycolaldehyde was examined using the membrane processes nanofiltration (NF) and reverse osmosis (RO), which exemplifies the crucial problem area of the retention of small organic compounds. Two RO- and one NF-membrane were tested in order to obtain two fractions, namely a C₃-enriched and a fraction containing mainly formaldehyde, methanol, and formic acid for a subsequently repeated aldol-condensation. In the case of a RO-process, operated until a volumetric concentration factor of 4 and two sequenced diafiltration steps, approximately 80% of formaldehyde, methanol, and formic acid were removed. Meanwhile, only about 40% of C₃-carbohydrates were found in the permeate.