用无机膜处理含镍废水

阐述了无机膜分离技术处理含镍废水的中试和半工业化试验，分析了无机膜处理含镍废水的可行性。     

硫铁矿处理含镍废水的研究

作者就含镍废水的初始浓度、ｐＨ值、硫铁矿的用量及吸附时间等影响吸附效果的因素作了探讨，并绘制了硫铁矿对镍离子的吸附等湿曲线。     

腐植酸树脂处理含镍废水

以风化煤为原料制成的腐植酸树脂,对含Ni2+废水进行处理。交换率达93%以上,Ni2+浓度低于0.5mg.L-1,二次污染大大降低,且具有明显的经济效益和环境效益。     

多级膜法+混床工艺处理砂轮厂含镍废水工程应用

采用多级膜法+混床工艺处理某砂轮厂含镍废水并回用,工程运行结果表明,该工艺处理效果良好,回用水水质稳定,总镍未检出,电导率20μS/cm,水质优于《生活饮用水卫生标准》(GB 5749—2006),满足厂方回用于工艺生产的要求,中水回用率达到100%,基本实现了废水的零排放目标。     

离子交换膜电解回收含镍废水中镍的研究

采用双膜三室电解法处理含镍废水,阴极电沉积金属镍,同时可得副产品盐酸,并研究各因素对电解过程的影响规律。结果表明:在电流密度为60 A/m2,p H为4,温度为40℃,Ti/Ir Ta作为阳极,电解时间为4 h条件下,镍回收率可达82.3%,电流效率高达85.3%,中隔室盐酸浓度为0.5 mol/L,处理后出水经离子交换富集循环使用。     

反渗透膜技术处理含镍废水

建立24m^3／d电镀镍漂洗水膜法闭路循环回收系统,采用两级反渗透（RO）膜分离技术对电镀废水浓缩50倍以上,23．6m^3/d透过液回用到电镀生产线作为漂洗用水,浓缩液再用蒸发器进一步浓缩后直接回到镀槽,废水处理实现闭路循环．从2005年4月到2007年4月,共运行了2年,整个系统运行良好。通过回用水和回收镍等资源,产生较显著的经济、社会和环境效益,实现清洁生产,基本上实现了电镀含镍废水的零排放。     

改性膨润土处理含镍废水的研究

介绍了一种制备改性膨润土的方法，并研究了此种改性膨润土在处理含镍废水时的用量吸附时间及放心水ＰＨ对吸附效率的影响。     

粉煤灰处理含镍废水的研究

以粉煤灰为吸附剂,应用于去除模拟废水中的镍,探讨了吸附时间、吸附剂用量、温度、溶液的pH值对吸附效率的影响。并对粉煤灰用碱进行了改性,改性后的粉煤灰对镍的去除率大幅度提高,可达93%以上。     

混凝法处理含镍电镀废水

通过正交实验和对比实验考察了两种絮凝剂FeSO4和PAC对废水中低质量浓度的Ni2+的去处效果,主要研究了添加絮凝剂的质量浓度、溶液的pH值、搅拌速率和搅拌时间等因素对去除率的影响,并对絮凝后的污泥性能进行相关实验.结果表明:絮凝处理操作简单,污泥产生量少,工业应用性强,且去除率较高;当溶液的pH值为9.6,FeSO4...     

电解法处理含镍废水的研究

含镍废水不仅造成镍金属的浪费,并且带来环境污染。通过配制硫酸镍溶液模拟含镍废水,采用电解法确定最佳阳极材料为钌涂层钛板,并研究了电解时间、电流强度和Ni~(2+)浓度等因素对Ni~(2+)的回收率的影响。实验结果表明:在电解时间240min,电流强度15A,Ni~(2+)质量浓度20g/L,电解温度50℃,p H值6,搅拌速率300r/min的条件下,Ni~(2+)的回收率为85.42%,电流效率为52.16%。     

Selective Facilitated Transport of Uranium(VI) Across a Bulk Liquid Membrane Containing Benzoyltrifluoroacetone as Extractant-Carrier

Abstract

A study has been made on carrier-mediated transport of uranium(VI) using a bulk liquid membrane prepared by dissolving benzoyltrifluoroacetone (HBTA) in carbon tetrachloride. The source phase comprised of a solution of UO₂ ²⁺ or its binary mixture with other cations such as Th⁴⁺, Hf⁴⁺, Zr⁴⁺, Fe³⁺, La³⁺, Cu²⁺, Co²⁺, Mn²⁺, Ni²⁺, and Zn²⁺ in aqueous solutions of pH 6.0, while 0.1 M hydrochloric acid was serving as a stripping agent in the receiving compartment. The interference from Th⁴⁺ and a few other cations could be eliminated by using trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid (DCTA) as a proper masking agent in the feed solution. Various factors influencing the transport process have been studied and an uphill transport (>99%) of uranium(VI) from the source phase could be accomplished under optimum conditions.     

Kinetic Study of an Effective Pb(II) Transport through a Bulk Liquid Membrane Containing Calix[6]arene Hexaester Derivative as a Carrier

The article describes transport of Pb(II) through bulk liquid membrane (BLM) containing calix[6]arene hexaester derivative (1) as a carrier. The effect of various parameters such as temperature, carrier concentration, stirring speed and type of solvent on the Pb(II) transport efficiency of the carrier through BLM was evaluated. The activation energy values for the extraction and re-extraction were found as 56.33 kJ mol^?1 and 14.79 kJ mol^?1, respectively. These values demonstrate that the process is diffusionally controlled by Pb(II). Observations indicate that the membrane entrance and exit rate constants (k₁, k₂) increase with increasing stirring speed as well as carrier concentration and decrease with increasing temperature. The effect of solvent on k₁ and k₂ was found to be in the order of CH₂Cl₂ > CHCl₃ > CCl₄.     

乳化液膜法处理含铬废水的研究

采用span-80-煤油－NaOH液膜体系对含Cr(VI)废水的处理进行了研究，讨论了不同操作条件对Cr(VI)去除率的影响，得出了提取Cr(VI)的最佳实验条件，实验结果表明：含Cr(VI)废水经液膜处理后，Cr(VI)的去除率可达98％。     

液膜分离技术处理化工废水的应用进展

液膜分离是一种高效、快速、节能的新型分离技术。文章综述了液膜分离技术处理化工废水的基本原理、技术进展及其应用实例。     

三聚氯氰工艺废水中氨氮的液膜处理方法

研究了乳状液液膜法去除三聚氯氰废水中的氨氮污染,选择了最佳的液膜体系,考察了各种因素对氨氮去除率的影响.结果表明:6%聚胺类表面活性剂(质量分数)、10%有机胺类添加剂(体积分数)、10%硫酸(体积分数)、油内比R01为2:1(体积比)的液膜体系,当乳水比Rew为1:8(体积比)、外水相pH值为11.8、传质15 min,可使氨氮含量为1114 mg/L的三聚氯氰废水-级去除率达97%以上.     

Highly Efficient and Selective Transport of Au(III) through a Bulk Liquid Membrane using Potassium-dicyclohexyl-18-crown-6 as Carrier

Abstract

The facilitated transport of Au(III) through a chloroform bulk liquid membrane containing potassium-dicyclohexyl-18-crown-6 as a selective ion carrier was designed. Au(III) as [AuBr₄]^?, quantitatively transported across the liquid membrane. In the receiving phase, L-cysteine acts as a specific stripping agent. The amount of Au(III) transported through the liquid membrane after 120 minutes was (96.2±1.3)%. The type of halide and its concentration, pH of source and receiving phase and also the type of stripping agents were optimized. The selectivity and efficiency of gold(III) transport from aqueous solutions containing various metal ions were investigated. The presence of EDTA in the source phase diminished drastically the competitive effect of interfering metals ion.     

乳状液膜分离技术在废水处理中的研究进展

乳状液膜分离技术是一种新型、高效、低成本的分离手段,近年来在环境保护是到广泛应用,本文较详细的介绍了这一新型手段在废水处理方面的研究和应用情况。