Showing papers by "Zümriye Aksu published in 1998"
TL;DR: In this paper, the effect of operating variables on the metal-ion sorption characteristics of agarose and agaroses-micro-organism systems in a fixed bed was investigated in a packed-bed column operated in continuous mode.
121 citations
TL;DR: In this article, the pollutant binding capacity of the biosorbent was shown as a function of initial pH, initial pollutant concentration and substituted group and the maximum loading capacity of biosorbents was found.
119 citations
01 Jan 1998
TL;DR: In this paper, the authors investigated the biosorption of single and multi-metal ions to free and immobilized micro algae in batch and continuous systems, and discussed the use and advantages of free and immobile algal cells for heavy metal removal.
Abstract: The removal of toxic or economically important heavy metal ions from wastewaters is of great importance from an environmental and industrial viewpoint. The biosorption of heavy metal ions by algae is a promising property with a potential for industrial use. The focus of this chapter is on investigating the biosorption of single- and multi-metal ions to free and immobilized micro algae in batch and continuous systems. There will be a discussion of heavy metal pollution, the usage and advantages of free and immobilized algal cells for heavy metal removal, biosorption mechanisms and developing isotherms in single- and multi-metal systems. Mathematical description of biosorption of a single metal ion to algae in a batch and in a continuous fixed bed column will also be presented and discussed.
110 citations
TL;DR: In this paper, a process of fully competitive biosorption of Cr(VI and Fe(III) ions to C. vulgaris and R. arrhizus from multi-component systems is described and compared to single metal ion situations in solution.
61 citations
TL;DR: In this paper, the authors investigated the effect of inlet metal ion concentration on the adsorption rate in a packed bed column reactor as a function of flow rate and inlet copper(II) concentration.
56 citations
TL;DR: A quantitative analysis of external mass transfer combined with a biodegradation reaction and correlation of the experiment with theory was performed for phenol removal using calcium-alginate gel-immobilized P. putida in a packed-bed column reactor and it was decided that the mass transfer correlation j D = 1.625 Re −0.507 accurately predicted experimental data.
46 citations
TL;DR: In this article, the removal of cadmium(II) ions to dried floes of C. crispata, a kind of green algae, was investigated in a packed bed column.
Abstract: In this study the biosorption of cadmium(II) ions to dried floes of Cladophora crispata, a kind of green algae, was investigated in a packed bed column. The cadmium(II) removal performance of the column was investigated as a function of the cadmium(II)-bearing solution flow rate and the inlet cadmium(II) concentration. Re- moval and total removal percentages of cadmium(II) related to flow volume were determined by evaluating the breakthrough curves obtained at three different flow rates for two different constant inlet concentrations. At the lowest flow rate the effect of inlet cadmium(II) concentration on the column capacity was also investigated. Data confirmed that early saturation and lower cadmium(II) removals were observed at higher flow rates and at higher cadmium(H) concentrations. Column experiments also showed that maximum specific cadmium(II) uptake values of C. crispata floes were as higher as those of other biomass sorbents.
19 citations
Journal Article•
TL;DR: In this article, the authors compared the simultaneous adsorption process of Cr(VI), Fe(III) by R. arrhizus and C. vulgaris and compared to single component systems.
Abstract: In this study, the simultaneous adsorption process of Cr(VI), Fe(III) by R. arrhizus and C. vulgaris and Cu(II) in pairs of metal mixtures were investigated and compared to single component systems. The capabilities of the fungal and the algal biomass to bind two metals simultaneously in solution are shown as a function of pH, metal combinations and levels of metal concentration. The effects of the co-presence of Cr(VI)-Fe(III) and Cr(VI)-Cu(II) ions together in aquatic solutions on the biosorption of Cr(VI), Fe (III) and Cu(II) ions were investigated in terms of initial rates of biosorption and equilibrium metal removal. Optimum pH for the biosorption of Cr(VI) and Fe(III) was determined as 2.0 whereas higher biosorptive uptake of Cu(II) was obtained at pH 4.0 Since the initial biosorption rates and equilibrium metal removal decreased with increasing concentration of the accompanying metal ion, the interactive effects of Cr(VI)-Fe(III) and Cr(VI)-Cu(II) on both microorganisms were found to be antagonistic.
2 citations