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重金属废水处理最新进展 总被引:25,自引:2,他引:25
详细论述了近年来一些处理重金属废水的新方法,并对各种方法进行了综合评述。这些新方法主要有:廉价吸附剂吸附、胶束增强超滤、络合—超滤耦合过程和电化学法。此外,将络合—超滤和电化学法集成起来处理重金属废水,可实现废水回用和重金属回收,因而具有广阔的应用前景。 相似文献
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胰,糜蛋白酶的超滤探索 总被引:4,自引:0,他引:4
在用BS膜超滤胰,糜蛋白酶的实验基础上,论述了压力,温度,浓度和膜面流速等对超滤效果的影响,分析了BS膜浓缩和精制胰,糜蛋白酶的可能性。最后,提出了膜的清洗方法。 相似文献
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超滤技术在现代中药生产中的应用 总被引:15,自引:0,他引:15
综述了超滤技术在中药现代化中的应用现状和发展趋势,包括超滤技术的基本原理和应用举例。同时指出了超滤技术的现存问题和发展方向等。 相似文献
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分析铁路给水现状及超滤技术在铁路给水中的优势:给水品质好、自动化程度高、制水工艺灵活。探讨了可应用于铁路给水的超滤工艺形式,提出常规超滤工艺适用于铁路给水厂,而短流程超滤工艺宜用于铁路给水厂(所)的升级改造。文中展望了超滤工艺运行的参数优化方法以及超滤设备智能化集成,是超滤技术应用于铁路给水的研究方向。 相似文献
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聚砜中空纤维超滤膜的制备及应用 总被引:3,自引:0,他引:3
采用溶胶-凝胶-相转换的方法,将具有力学强度高,抗蠕变性能强,耐热性和化学稳定性好的工程塑料-聚砜树脂,制成侧壁布满5-100nm 微孔,外径1mm左右,内径0.7mm左右的圆中空纤维,即聚砜中空纤维超滤膜。该膜可有效截留水中的细菌,微粒,胶体和大分子有机物。由这种超滤膜制成的超滤装置具有分离速度快,使用寿命长,处理能力多样,操作简便等特点,该超滤装置可适用于多种复杂溶液,已被广泛应用于环保水处理,饮用水净化及食品,医药等领域。 相似文献
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Membrane fouling is one of the major obstacles for reaching a high flux over a prolonged period of ultrafiltration (UF) process. In this study, a sulfonated-polyethersulfone (SPES)/nano-TiO2 composite UF membrane with good anti-fouling performance was fabricated by phase inversion and self-assembly methods. The TiO2 nanoparticle self-assembly on the SPES membrane surface was confirmed by X-ray photoelectron spectroscopy (XPS) and FT-IR spectrometer. The morphology and hydrophilicity were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle goniometer, respectively. The anti-fouling mechanism of composite UF membrane was discussed through the analysis of the micro-structure and component of UF membrane surface. The results showed that the TiO2 content and the micro-structure of the composite UF membrane surface had great influence on the separation and anti-fouling performance. 相似文献
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稳态工况下板式超滤器的计算 总被引:3,自引:0,他引:3
文章探讨了稳态工况下板式超滤器中表面剪切力沿膜通道长度方向的变化规律及其对膜设备的过滤通量和膜表面上沉积层的厚度沿膜通道长度方向的影响。 相似文献
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以重庆某水库水为对象,考察了曝气生物滤池-超滤组合工艺对高氨氮、高有机物原水中污染物的去除效果。结果表明:试验装置运行期间,进水CODMn平均值为7 mg/L,出水CODMn平均值为3.5 mg/L,CODMn平均去除率为50.0%;进水氨氮平均值为0.65 mg/L,出水氨氮平均值为0.12 mg/L,氨氮平均去除率为81.5%。组合工艺对CODMn和氨氮的平均去除率较曝气生物滤池分别提高了26.9%和11.4%,较常规絮凝-沉淀工艺分别提高了20.0%和58.5%,原水经曝气生物滤池-超滤组合工艺处理后,其氨氮、CODMn均满足《生活饮用水卫生标准》(GB 5749—2006)中的相关要求。 相似文献
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The performance of a laboratory packed-column for the manufacture of urea-formaldehyde (UF) concentrates is analyzed. Gaseous formaldehyde was generated by the thermal decomposition of paraformaldehyde in a carrier nitrogen stream. The UF solution was continuously recirculated through a glass column filled with Raschig rings. No pH control was necessary when the operation was started using a solution with a F/U molar ratio higher than 3.5 to 4. Otherwise, insoluble resins appeared during the operation. The formaldehyde absorption rate was controlled by the gas phase resistance. The vapor composition in equilibrium with a typical UF concentrate is provided as a function of temperature. 相似文献
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《分离科学与技术》2012,47(9):1482-1494
In this work a magnetic adsorbent, magnetic activated carbon (MAC) was prepared and characterized by powdered X-Ray diffraction (XRD). A comparison was made between powdered activated carbon (PAC) and MAC for foul control in ultrafiltration (UF) membrane processes. First, the adsorptive parameters for PAC and MAC were determined for phenol, chlorophenol, nitrophenol, and hydroquinone. Equilibrium data fitted well to the Langmuir model in the studied concentration range of the adsorbates. Adsorption kinetics followed a pseudo second-order kinetic model rather than pseudo first-order kinetic model. These adsorbents were then used in combination with UF membrane. The parameters like percent rejection and flow rate for the hybrid UF/PAC and UF/MAC were determined. The influences of both adsorbents on flow rates and percent rejections were almost equal. The problems associated with PAC in the UF processes like cake formation and blackening of the pipes were not observed for MAC. MAC was removed from the slurry after use through a magnetic process. 相似文献
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A solid state 13C NMR study of hardened networks obtained by the reaction of blocked and nonblocked isocyanates (pMDI) with urea‐formaldehyde (UF) resins in water showed different results according to the temperature of the reaction. At high temperature, in water, both a nonblocked or an emulsifiable, blocked isocyanate, appear to crosslink with UF resins through the formation both of traditional methylene bridges connecting urea to urea and of urethane bridges. The latter have been confirmed by 13C NMR to form in water by reaction of the isocyanate ? N?C?O group with the hydroxymethyl groups of the UF resin. At ambient temperature, UF/pMDI resins where the pMDI is a emulsifiable blocked isocyanate, do not appear to form urethanes to any great extent but rather to crosslink through the usual UF resin urea to urea methylene bridges. Even in this case, when urethane bridges appear to be absent, evidence of crosslinking in water through reaction of the isocyanate with the ? NH2 and ? NH? amide of the UF resin has not been observed. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 589–596, 2006 相似文献