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《分离科学与技术》2012,47(14-15):2231-2267
Abstract The removal of heavy metals from water by using electrodialysis is discussed. Parameters studied include current efficiency, stack resistance, and osmotic water transfer. Four single-electrolyte systems are investigated: CdCl2 and CdSO4 are used as representative heavy metal salts; NaCl and CaCl2 are studied in order to enhance the understanding of physical electrodialytic processes in general and to provide a basis of comparison. The variables of electrolyte type, electrolyte concentration, pH, temperature, and elapsed time of membrane usage are examined. Results indicate that the purification of cadmium-laden waters can be achieved while maintaining high current efficiencies and reasonable stack resistances. The osmotic water transfers (in units of liter/mole) of the above cadmium salts are small enough to allow a high percentage of a wastewater stream to be reclaimed as purified water. but are higher than the water transfers of NaCl and CaCl2 due to increased hydration effects. 相似文献
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电渗析浓缩模拟浓盐水工艺的实验研究 总被引:1,自引:0,他引:1
海水资源的综合利用和环境保护的要求极大地促进了淡化后浓盐水的处理技术的发展。电渗析是盐水浓缩广泛关注和应用的技术之一,膜性能和操作条件对电渗析过程特性有着重要的影响。实验研究了以模拟海水淡化浓水(含盐量70 g·L-1)为原料的间歇循环电渗析过程,以浓度150 g·L-1、能耗120 kWh·(tNaCl)-1,为目标,研究了浓室流量、浓淡室流量比、操作温度、操作电压对能耗和相对浓缩率的影响。实验结果表明,温度和浓室流量对实验结果影响不大,而电压和浓淡室流量比影响比较大,实验所得最佳操作条件为浓室流量250 L·h-1,浓淡室流量比2:3,电压19V和操作温度30℃。 相似文献
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The characteristic feature of this cooling tower water treatment is the intermittent addition of ozone for several days. 相似文献
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以长庆靖边气田被污染的三甘醇溶液为实验对象,采用四室电渗析反应器对其进行净化处理,研究了操作电压、运行时间、淡室进液流量、进液总溶解性固体(TDS)浓度等因素对处理后溶液品质的影响。在单因素实验的基础上,采用响应面分析法对电渗析工艺进行了优化。优化的工艺条件为:操作电压48.92 V,运行时间128.09 min,淡室进液流量12.00 L/h,当被污染的三甘醇溶液TDS质量浓度为1 968 mg/L时,在此工艺条件下处理后TDS浓度可降至(38.3±1.2)mg/L。实验中对电渗析过程的极限电流进行了测定,在淡室进液流量为12.00 L/h时,测得极限电流为0.189 A,对应的极限电压为66 V,说明装置在优化条件下运行不会出现浓差极化等不正常现象。 相似文献
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河北三洋化肥有限公司采用中国农业科学院新型肥料研究所最新肥料生产技术,将脲醛应用于复合肥生产中,近日建成1套200kt/a脲醛多聚控释肥生产装置。 相似文献
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本文通过聚乙烯本性改性、表面改性以及粘合剂的选择,探讨了聚乙烯与铝材的粘结,发现通过表面改性或/和使用热交、可以使铝材和聚乙烯达到优良的粘结,在实际上可获得应用。 相似文献
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非平衡等离子体在水处理技术中的应用及研究 总被引:1,自引:0,他引:1
非平衡等离子体水处理方法是一项高效、无二次污染的绿色环保技术。它具备高温热解、光化学氧化、高能电子、超临界水氧化等多种方法的综合效应,有广泛的适用性。本文系统介绍了非平衡等离子体技术在废水处理中的应用,通过总结和分析目前研究中存在的不足,提出该技术今后发展的方向。 相似文献
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电渗析器运行一段时间后出水偏酸性,分析原因,主要是膜污染严重,导致浓差极化造成。结合本厂实际进行相应处理,并提出了一系列预防措施以保证水质,同时也介绍了一种测定极限电流的简单方法。 相似文献
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《分离科学与技术》2012,47(3):445-454
Electrodialysis (ED) was assessed for integration in a nanofiltration NF/ED sequence for water reuse in the leather industry. Two ED feeds composed of different model solutions were used: Model Solution FED1, which is a surrogate of a nanofiltration permeate generated by the NF processing of a biologically treated leather effluent, and Model Solution FED2, which has the same salt concentration as FED1 but with an organic matter content that is approximately ten times higher. The electrodialysis experiments were carried out in a five-compartment bench cell using cationic and anionic membranes HDX 100 and HDX 200. The final product water, with a conductivity ranging from 3.28 to 3.67 mS cm?1, can be reused as process water for beamhouse operations. With respect to chloride and COD parameters, the ED product water meets the requirements of process water, even for dyeing operations. An alkaline membrane cleaning process for fouling removal was also tested for the membranes using Model Solution FED2. The cleaned membranes were evaluated in terms of visual aspect, polarization curves, TGA, and SEM/EDS analysis. The results obtained with the cleaned membranes were very similar to those obtained with the new ones in ED experiments with Model Solution FED2. 相似文献
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《净水技术》2015,(6)
为研究强化生态浮床对地表水的净化作用,选取了鸢尾、菖蒲、千屈菜、伞草、美人蕉五种常见浮床植物,筛选硝化菌、反硝化菌、氨化细菌结合竹炭制作生物基,构建微生物-植物组合生态浮床进行水体修复的室内模拟。结果表明五种植物构建的普通生态浮床对TN、NH3-N、TP和COD的平均去除率分别为51.1%、51.2%、28.4%和43.6%,其中美人蕉的综合净化效果最佳,菖蒲、鸢尾、伞草次之,千屈菜最差。添加适量生物基,构建微生物-植物复合系统,可明显提高对水质的净化效果,TN、NH3-N、TP和COD的平均去除率分别为84.1%、85.6%、62.6%和72.4%,其中生物基与美人蕉、鸢尾、菖蒲的组合系统,可使出水水质达到Ⅲ类水体要求,生物基-美人蕉组合对TP的去除效果达到Ⅱ类水体要求。试验证明生物基浮床可强化地表水的原位修复。 相似文献