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超滤-反渗透膜组合工艺处理电厂循环排污水 总被引:7,自引:0,他引:7
本文详细介绍了北京京丰天然气燃机联合循环电厂使用超滤-反渗透膜组合工艺处理循环水排污水。循环水排污水回用系统的最大问题是反渗透膜的污染控制问题。因为循环水排污水相对水质较差,因此对预处理技术要求较高,采用超滤膜作为预处理系统,能够很好地解决这个问题。北京京丰热电厂通过长时间的工业化运行,证明了在处理回用循环水排污水过程中,超滤作为反渗透预处理系统的可行性,也积累了该工艺处理循环水排污水用于电厂循环补充水和锅炉补给水方面的应用经验. 相似文献
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为了减少吨氨外排水量,对循环水系统的排污水进行预处理,然后经超滤、反渗透脱盐,再返回循环水系统。"三法净水"装置预处理循环水系统排污水的中试结果表明,该装置能有效处理高盐、高硬、高COD含量的排污水,运行成本略低于石灰法,为超滤和反渗透装置的稳定运行提供了良好的条件。 相似文献
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介绍了"预处理+超滤+反渗透"组合工艺的特点及工艺流程,该装置以循环水系统排污和塔底排污水为主要处理对象,通过对高含盐量、高碱度和硬度来水深度处理,产水达到工业回用水要求,作为循环水系统补水回收利用。 相似文献
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介绍了烟台发电厂投入运行的循环冷却排污水的深度处理系统,该系统由预处理、预除盐、一级除盐、深度除盐等部分组成,它以电厂的循环排污水作为水源制取除盐水,与原有的水处理车间的除盐水一起供应烟台市供热管网首站用水和电厂锅炉用水.系统投入运行后降低了循环水的浓缩倍数,改善了循环水的运行工况,解决了电厂中循环水排污水处理难的问题,实现了循环冷却排污水的回收利用,达到了循环水的零排放,提高了水利用率,降低了电厂的水耗. 相似文献
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鄂尔多斯某煤化工厂回用水处理装置主要进水水源为污水处理装置出水、循环水场排污水及脱盐水站的排污水,采用匀质池+高效澄清器+多介质过滤器+超滤及反渗透的组合处理工艺,出水用作循环水场补水。本回用水处理装置已经建成运行近1 a,运行结果表明,装置运行稳定,出水水质达到《污水再生利用工程设计规范》(GB50335—2002)中再生水用作循环冷却系统补充水的水质标准。 相似文献
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针对循环水排污水水质特点,进行了回用处理工艺实验研究。结果表明,强化混凝可有效去除循环水排污水中的有机物,对COD、TOC去除率分别为61.2%、47.5%,减轻后续膜系统的有机污染;二级软化对Ca~(2+)、Mg~(2+)、总磷、TOC、全硅的去除率分别为86.5%、92.5%、97.9%、27.4%、84.3%,减轻后续膜系统的无机污染;反渗透回收率可达到85%,反渗透产水可以作为锅炉补给水水源,反渗透浓水可以作为脱硫工艺用水。提出了地表水水源循环水排污水强化混凝-二级软化-超滤-反渗透回用处理工艺。 相似文献
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中空纤维膜的研究现状与发展 总被引:10,自引:0,他引:10
本文综述了中空纤维膜近年来国内外在反渗透、超滤、微滤及气体分离方面的开发应用现状。重点介绍了在渗透汽化、膜萃取、膜蒸馏等过程中的最新研究状况,并提出了对发展中空纤维膜的几点看法。 相似文献
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Forward osmosis (FO), as one of the emerging desalination technologies, has the potential to produce freshwater from a variety of water sources by utilizing the osmotic pressure gradient across a semi-permeable membrane. Drawsolution, as an essential component of any FO process, can extract watermolecules fromseawater orwastewater. An ideal draw solution should meet three essential requirements, namely high osmotic pressure, low reverse flux, and facile regeneration mechanism. The selection of proper draw solutes is especially critical for an energy-efficient FO process since the energy consumption mostly arises from the separation or regeneration of the draw solution. Recently, we developed a few multi-functional FO draw solutes, mainly aiming to enhance the FO water flux and to explore facile re-concentration methods. This review summarizes these draw solutes, including Na+-functionalized carbon quantum dots, thermoresponsive copolymers, hydrophilic magnetic nanoparticles, and thermoresponsive magnetic nanoparticles. 相似文献
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Jim D. Roach Abdulrahman Al-Abdulmalek Alaa Al-Naama Mohammed Haji 《Journal of surfactants and detergents》2014,17(6):1241-1248
Recent advances in membrane technologies have enhanced the viability of water treatment strategies that employ semipermeable barriers. Forward osmosis (FO), which exploits the natural osmotic pressure gradient between a “draw” solution and a “feed” solution to produce potable water, offers a low‐energy, low‐cost alternative to more conventional treatment methods. Surfactants, because of their tendencies to aggregate into micelles and to adsorb at interfaces, provide intriguing osmotic pressures and offer exploitable properties by which draw solutions can be regenerated. The effectiveness of surfactant‐based FO using cellulose triacetate membranes has been assessed in terms of water flux and reverse surfactant diffusion using cetylpyridinium chloride, sodium dodecylsulfate, and Triton X‐100. The ratios of water flux to surfactant flux exceeded 600 L mol?1 for all surfactants studied. Surfactant recoveries of over 99 % were achieved by ultrafiltration using regenerated cellulose membranes. 相似文献
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正渗透是以渗透压差为驱动力的新型膜分离过程。采用水流分布较佳的膜池结构,研究了膜朝向、流动方式对正渗透水通量性能的影响,结果表明PRO模式(当膜的活性层朝向驱动液时)的水通量明显高于FO模式(当膜的活性层朝向原料液时),但其衰减程度较大;在溶液浓度差相同的条件下,逆流操作更利于水通量的提高。针对FO模式和逆流条件,探讨了溶液温度对水通量和反向盐通量的影响,结果表明:膜两侧溶液温度同步升高时,正渗透过程的水通量和反向盐通量均增加,且水通量的增加幅度大于反向盐通量;单侧增加溶液的温度时,驱动液侧温度升高对水通量性能的提升效果优于原料液侧。综合考虑过程能耗和系统性能,认为单独升高驱动液温度更具实用价值。 相似文献
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Membrane hydrophilicity influences the transport of water through the membrane in osmotically driven separations such as forward osmosis. In this paper, we coated the polysulfone support layer of two types of commercially available reverse osmosis membranes (brackish water and seawater) with hydrophilic polyvinyl alcohol (PVA). The aim of this was to increase the support layer hydrophilicity and, correspondingly, the rate of water transport through the membrane. Previous work with polydopamine coatings of the polysulfone support of reverse osmosis membranes has yielded promising results. In this work, we explore more readily available materials. Specifically, we studied the effects of two different PVA crosslinking agents – maleic acid and glutaraldehyde – on the resultant membrane properties and osmotic performance. For seawater membranes we found that PVA crosslinked to a limited degree with maleic acid creates a significant improvement in water flux in RO and FO systems, as compared to membranes with PVA crosslinked by glutaraldehyde. However, brackish water membranes did not have comparably significant changes in membrane performance. We conclude that the smaller pores of the brackish water membrane become clogged, and this effect is magnified by the lack of fractional free volume available within PVA that is highly crosslinked with glutaraldehyde. 相似文献