膜分离技术在镀镍漂洗水回收中的应用 Ⅰ漂洗水的预浓缩

简述了采用膜分离技术浓缩镀镍漂洗水的可行性 ,以及回收利用漂洗水中的镍和水资源。实验的结果为实际系统的设计和运行提供依据和借鉴。膜分离技术应用于电镀废水处理将带来显著的社会效益。     

膜分离技术在镀镍漂洗水回收中的应用I漂洗水的预浓缩

简述了采用膜分离技术浓缩镀镍漂洗水的可行性,以及回收利用漂洗水中的镍和水资源。实验的结果为实际系统的设计和运行提供依据和借鉴。膜分离技术应用于电镀废水处理将带来显著的社会效益。     

新型纳滤膜分离电镀镍漂洗水的试验研究

本文介绍了TFC?-S型纳滤膜分离电镀镍漂洗水的试验研究,讨论了温度、操作压力、浓差极化、共存离子对膜分离性能的影响。结果表明,这种纳滤膜对电镀镍漂洗水中Ni2 的去除率高于99.5%,透过液中Ni2 质量浓度小于1mg/L;对CODCr的去除率大于96%,透过液中CODCr低于14mg/L,达到国家工业废水排放标准(GB8978-1996),可以直接排放或回用于镀件漂洗。     

镀镍废水膜法浓缩回用工艺

研究了采用膜分离技术一次性连续浓缩回用镀镍漂洗水的可行性。结果表明:使用BW反渗透膜可以获得79.5%的淡水,透盐率为2.75%;所产浓水再次加压后利用SW反渗透膜继续浓缩约8.3倍。整个系统能耗率为0.9~1.1 kW.h/m3,系统将镀镍漂洗水浓缩40倍后,镍的质量浓度达12~16 g/L,透过液和浓水经处理后回用。     

电镀行业镀镍漂洗废水回用技术综述

废水回用是电镀企业发展中必然要达到的要求。本文分析了镀镍漂洗废水水质特性、主要成分,对现有镀镍漂洗废水回用技术的优缺点进行了分析和讨论,并对电镀废水回用标准进行了探讨。     

用反渗透技术回收镀镍漂洗水

利用反渗透技术将镀镍漂洗水浓缩分离,浓缩液中ρ(Ni2+)达到20 g/L左右,浓缩液补加到镀镍槽中,透过液在镀镍漂洗槽中循环使用,实现了镀镍废水的零排放.向镀镍槽中加入硫酸钾,提高镀液的导电性能,同时降低镀液中氯化镍的质量浓度,使镀镍过程中阳极溶解速度和阴极沉积速度相接近.镀件在镀镍前和镀镍后都经过回收槽漂洗,使回收槽中镍离子的质量浓度保持不变.大约是镀镍槽中镍离子质量浓度的一半.采用这些措施后,可实现反渗透浓缩液的完全回收利用.     

镀镍废水处理技术的研究进展

镀镍工业产生大量的含镍废水,会对环境造成污染。介绍了镀镍工业含镍废水的来源及性质,综述了镀镍工业含镍废水治理技术,介绍了化学沉淀法、离子交换法、膜分离法、生物法及乳状液膜等方法,并对各方法的适用条件及处理效果进行了总结,对镀镍废水进行深度处理,镍资源回收利用是发展方向。     

镀镍漂洗水反渗透浓缩液的使用

利用反渗透技术将镀镍漂洗水浓缩分离,浓缩液补加到镀镍槽中,透过液在镀镍漂洗槽中循环使用。向镀镍槽中加入硫酸钾,提高镀液的导电性能,同时降低镀液中氯化镍的浓度,使镀镍过程中阳极溶解速度和阴极沉积速度相等。镀件在镀镍前和镀镍后都经过回收槽漂洗,使回收槽中镍离子的浓度保持不变。用过硫酸钠氧化和活性炭吸附浓缩液中的有机杂质,用氢氧化钾沉淀铁杂质,用电解法处理铜杂质,用电解法和锌抑制剂组合法处理锌杂质。采用这些措施后,可实现反渗透浓缩液的完全回收利用。     

反渗透技术处理电镀废水的研究、应用与进展

七十年代初开始试验用反渗透法处理电镀废水,首先用于镀镍漂洗水的回收处理。此后又应用于处理镀铬、镀铜、镀锌漂洗水以及混合电镀废水。由于技术上的可靠性和显著的经济效益,对镀镍漂洗水的处理运用比较广泛。据文献报导,仅美国就有106套反渗透装置用于镀镍漂洗水的处理。目前反渗透处理电镀废水的装置已达850米~3/天的规模。在我国,应用在镀镍、镀铬等漂洗水的回收处理方     

膜分离技术在镀镍废水处理中的应用

综述了电镀废水处理工艺的发展历史,介绍了膜分离技术处理镀镍废水的工艺特点,分析了二级膜分离技术的经济效益.     

Removal of Nickel from Electroless Nickel Plating Rinse Water with Di(2‐Ethylhexyl)phosphoric Acid‐Impregnated Supports

Abstract

Electroless nickel plating technology is playing an increasingly important and indispensable role in many fields such as the electronic and automobile industries. As a result, the treatment of the rinse water containing about 50 mg/dm³ of nickel is becoming a serious environmental problem. Although this water is currently treated by the conventional precipitation method, a method without sludge generation is highly desired. This study explores the possibility of removing and recovering nickel from the rinse water with di(2‐ethylhexyl)phosphoric acid‐impregnated supports (D2EHPA‐IS). Macroporous polymer and oil adsorbents made of synthetic and natural fibers as the supporting materials were tested for the nickel removal abilities from simulated rinse water. In the batch experiments, more than 90% of the nickel can be adsorbed by these D2EHPA‐IS without pH adjustment. The adsorption of nickel reaches the equilibrium within 1.2 ks at 298K at a shaking rate of 140 rpm. The pH‐dependency of the nickel adsorption by the D2EHPA‐IS shows that the nickel is adsorbed by a cation exchange reaction. The adsorbed nickel can then be readily eluted with mineral acids. Most of the IS can be used many times without losing their adsorption abilities. In the column experiments, the breakthrough curves of nickel for these supports indicate that the nickel–D2EHPA complex formed at the high nickel loading region tends to dissolve into the aqueous phase. These findings lead to the conclusion that most of the studied D2EHPA‐IS are effective for the removal and recovery of nickel from an electroless nickel plating rinse water in batch mode.     

含镍电镀废水处理技术研究进展

综合国内外含镍电镀废水处理技术,介绍了分析化学法、离子交换法、蒸发浓缩法、吸附法、膜分离技术及生物膜法等处理含镍电镀废水的技术方法,并比较了其优缺点。     

成功推行环保电镀及材料循环利用的经验(一)

介绍了3种环保电镀方法:通过省水、回用水工艺降低用水量;通过低污染、长寿命工艺降低污染物排放量;通过易处理、可生物降解工艺降低污染物处理难度。研究了清洗次数对清洗水量的影响。比较了4种常用回用水技术包括RO(反渗透)、NF(纳米过滤)、UF(超滤)和MF(微滤)等的工艺特点。对前处理液回用技术──油脂吸附过滤系统进行了详细说明。并对6种贵金属回收工艺进行了讨论。     

Development of an ion exchange system for plating wastewater treatment

Ion exchange technology was applied to this study to treat nickel ion from plating wastewater which contains heavy metal, bringing environmental problems such as chromium, zinc, copper, and lead. To separate nickel ion from wastewater, the nickel recovery unit (NRU) used a column packed with strongly acidic cation resin. The leak of the ion appeared when rinse water that has a concentration of 1.8 g-Ni/L-distilled water flowed into the NRU as much as 20 times the bed volume. At this time, the capacity of resin packed in the column was 1.7 meq/ml and over 99% nickel ion was removed. Sulfuric acid was employed with a reagent in order to regenerate nickel ion from the resin adsorbed. Nickel ion recovered by sulfuric acid was obtainable up to 120 g-Ni/L. The concentration of sulfuric acid was 2N and space velocity was 2/h. Acid retardation unit (ARU) experiment could be accomplished by deacidification to control the pH of the solution to recycle in the plating process. The composition was 30 g-Ni/L and the pH maintained was over 3.0.     

Removal of Nickel and Boron from Plating Rinse Effluent by Electrochemical and Chemical Techniques

In this work, electrotreatment of nickel and boron containing plating rinse effluents was studied with mild steel and aluminum electrodes. Industrial effluent treatment directly by an electrochemical technique is capable of removing 80–85 % nickel. The residual nickel interfered with boron determination by curcumin method. The pH fall during electrotreatment in industrial effluent is due to electrodeposition of nickel at the cathode surface, evidenced by simulated effluent treatment. Nickel concentration can be reduced below the discharge limit from the industrial plating effluent by chemical precipitation and coagulation at pH above 8. Chemical precipitation showed maximum boron removal of about 50 %. Boron removal was 29.3–41.9 % and 20.6–33.1 % with ferric chloride and aluminum sulfate, respectively. A combination of chemical precipitation at pH 8.7 followed by electrotreatment reduces nickel to the discharge limit and also maximizes boron removal up to 59 %.     

脉冲电絮凝处理化学镀镍漂洗水

采用脉冲电絮凝法处理化学镀镍漂洗水。分别将铁片和镍片作为阳极和阴极。研究了初始pH值、电流密度、极板间距和反应时间对镍离子的去除率和铁离子的质量浓度的影响。结果表明:在起始pH值7、电流密度0.8A/m~2、极板间距3cm、反应时间30min的条件下,镍离子的去除率达到99.9%,并且铁离子的质量浓度低于0.2mg/L。     

膜技术在废水处理中的应用

介绍了膜技术在电镀废水、大豆分离蛋白废水、化纤厂空调冷却水、海带提碘废水处理的应用实例。膜技术应用于废水处理的前景广阔,市场潜力大,应加强高性能膜和组器的开发,加强膜污染防治技术的开发。