硅藻土吸附处理铜离子废水的研究

本文以硅藻土为吸附剂,静态处理含铜废水,探讨了硅藻土用量、吸附时间、初始p H值、反应温度和污染物初始浓度对废水处理效果的影响,结果表明：在污染物浓度为60mg/L,硅藻土用量为5 g/L、吸附时间为30 min、p H值为5、温度为25~35℃时,铜离子去除率可达62%。在30℃及p H等于5时,最大吸附量为13.831 mg/g,符合Langmuir方程。

矿山含铜重金属废水微生物处理试验研究

自矿区环境中筛选并培养出了嗜水气单胞菌,对配置的模拟含Cu2+废水和实际矿山含铜酸性废水采用嗜水气单胞菌进行了试验研究,同时探讨了吸附机理。结果表明,影响该菌体吸附Cu2+的主要因素有溶液pH值、预处理方式、吸附时间以及共存离子、菌体浓度等;在一定条件下,该菌体能有效吸附Cu2+,实际矿山含Cu2+废水经二次吸附可达标排放。机理分析表明,菌体中的NH2和C=O是微生物菌体吸附Cu2+的主要基团。

线路板厂含铜废水离子交换法工艺探讨

离子交换法是现代工业技术中常用的一种净化方法。应用电解和置换的方法能够在一定程度上对废水处理效果进行大幅度增高。离子交换法的研究是以离子交换法作为基本的原理。本文主要对离子交换法在印刷电路板厂含铜废水中的使用进行了分析,为我国的社会污水处理提供了一种更为有效的处理技术。

氧化石墨气凝胶处理重金属离子废水的研究

通过水热还原-冷冻干燥法制备了氧化石墨气凝胶材料,研究了氧化石墨气凝胶处理铜离子废水的可行性,主要探索了氧化石墨气凝胶在不同铜离子浓度、不同溶液pH值、不同反应时间和不同反应温度下对铜离子的吸附性能。通过条件优化,最终得到了氧化石墨气凝胶处理铜离子废水的最佳吸附条件。

壳聚糖和高炉渣复合材料的制备及其对污水处理的研究

将壳聚糖和高炉渣制成复合吸附剂,采用振荡吸附实验,探究了吸附剂的投加量、粒度、振荡时间以及高炉渣与壳聚糖的配比对铜离子废水吸附效果的影响。实验结果表明,当投加量为5.0g/L,粒度为100目,振荡时间为2 h,高炉渣与壳聚糖的配比为30:1时,复合吸附剂对Cu2+的吸附达到最佳。

Synthesis of platy potassium magnesium titanate and its application in removal of copper ions from aqueous solution

Platy potassium magnesium titanate (K0.8Mg0.4Ti1.6O4, KMTO) was synthesized by a flux method. The potential application of KMTO in removing copper ions from water pollutants was investigated. The crystal phases of specimens were identified by XRD. The morphology and structural information were characterized by SEM and TEM. The adsorption behavior under different conditions was investigated, including different pH values and different initial copper ion concentrations. The results show that the maximum adsorption capacity of Cu(II) ions is 290.697 mg/g, and almost 99.9% of Cu(II) ions can be removed, which is much higher than that of other sorbents reported. The kinetics of KMTO for the adsorption of Cu(II)ions was studied and the best fit can be obtained by the pseudo-second-order model. Adsorption isothermal data can be well interpreted by the Freundlich equation (R2=0.991). In conclusion, this study highlights that KMTO is a potential material for the efficient removal of heavy metal ions in polluted water. It also opens up a new opportunity for the applications of platy KMTO.

Equilibrium and kinetics of copper ions removal from wastewater by ion exchange

The removal of copper ions from wastewater by ion exchange has been studied using an iminodiacetate resin.The capacity of the resin for the copper ions has been determined to be 2.30 mmol·g^(-1) by measuring the equilibrium isotherm at 25 °C and initial pH value of 3.5 where the final equilibrium p H value is 5. An analysis of equilibrium isotherm models showed that the best fit model was the Langmuir–Freundlich. The kinetics of the ion exchange process have been investigated and four kinetic models have been tested namely: Ritchie model, pseudo-second order model, pseudo-first order model and the Elovich model. The pseudo-second order model provides the best fit to the kinetic data.

Purification of Organic Wastewater Containing Cu^(2+) and Cr^(3+) by a Combined Process of Micro Electrolysis and Biofilm

A complex process of micro electrolysis and biofilm was developed to continuously treat organic wastew-aters containing heavy metal ions such as Cu2+ and Or3+, and the relevant purifying mechanism was also addressed. In detail, organic materials in wastewater could be consumed as nutritious source by biofilm composed of aerobes and anaerobes. However, for heavy metal ions (Cu2+, Cr3+), part was removed by electrodeposition, and some was adsorbed on biofilm. In order to compare with the combined process of micro electrolysis and biofilm, the experimental data of micro electrolysis process (intermittent) or biofilm process (continuous) were provided, and the kinetic data of C6H12O6 (glucose) biodegradation by cultured microbes or acclimated microbes were also obtained. These experimental results indicated that for wastewater initially consisted of CeH12O6 (500mg-L-1), Cu2+ and Cr3+ (10mg-L-1), after treatment, its concentrations of C6H12O6, Cu2+ and Cr3+ were lowered to the level of 55-65mg.L^1, and less than 1mg-L-1, respectively. And the industrial reused water standards could be met by treated wastewater.

Recovery of Copper Ions from Wastewater by Hollow Fiber Supported Emulsion Liquid Membrane

Recovery of copper ions from wastewater using a hollow fiber supported emulsion liquid membrane (HFSELM) was studied with LIX984N as carrier, kerosene as diluents, and sulfuric acid solution as stripping phase. Effects of compositions of feed and emulsion liquid phase, flow rates on both sides of membrane, and hollow fiber module parameters were investigated. The stability of the emulsion liquid phase without surfactant and the effect of buffer in the feed phase on the extraction rate were also evaluated. It is found that the stability of the emulsion phase without surfactant is poor. Higher flow velocity gives shorter residence time for the emulsion liquid phase on the tube side, reducing the effect of particle coalescence on the separation process. The extraction rate increases with the increase of feed phase pH, carrier concentration, hydrogen ion concentration in the stripping phase, and ef- fective hollow fiber area. The phase ratio in the emulsion liquid phase has a negative effect on extraction rate. The flow rates on both sides have little influence on the extraction performance of the HFSELM, while buffer addition in the feed solution improves the extraction efficiency.