Abstract
This paper presents the results of investigations concerning the simultaneous removal of Al(III), Cu(II), and Zn(II) from dilute aqueous solutions using ion and precipitate flotation methods. The effects of initial solution pH, surface active substance concentration, and the gas velocity on the flotations’ efficiency and course are studied. Experimental results are discussed in terms of physicochemical aspects related to aqueous solutions of metal salts. The results indicate that satisfying simultaneous flotations of aluminum, copper and zinc species are observed if the pH value ranges between 7.0 and 9.0. It was found that an increase in collector concentration results in a decrease in the flotation rate constants. An increase in the gas velocity results in an increase in the ion and precipitate flotation rates.
Highlights
Aqueous Solutions Using Ion and Discharge of waste streams containing metal ions into aquatic systems, mainly due to industrial operations, is still posing a threat to human health and the environment [1,2].Strict legal standards regarding the permissible concentrations of metals in wastewater require the use of efficient methods of treatment of this type of streams, especially those from the metal and metallurgical industries [3].The most common method of removing of the metal ions from wastewater is chemical precipitation [4]
This mechanism is related to the stoichiometric proportion between the concentration of the collector i.e., sodium dodecyl sulphate and metal ions, known as colligend ions [15]
At pH = 8.0, micelles containing hydroxides of 6 of precipitate aluminum, copper, and zinc are present in the flotation solution
Summary
Aqueous Solutions Using Ion and Discharge of waste streams containing metal ions into aquatic systems, mainly due to industrial operations, is still posing a threat to human health and the environment [1,2].Strict legal standards regarding the permissible concentrations of metals in wastewater require the use of efficient methods of treatment of this type of streams, especially those from the metal and metallurgical industries [3].The most common method of removing of the metal ions from wastewater is chemical precipitation [4]. Strict legal standards regarding the permissible concentrations of metals in wastewater require the use of efficient methods of treatment of this type of streams, especially those from the metal and metallurgical industries [3]. In recent years, for the treatment of industrial wastewater from metal ions, various methods were proposed. These include ion exchange, membrane and adsorption processes [5,6,7] including the application of low-cost adsorbents [8], bioremediation processes [9], remediation using metallic iron [10], electrokinetic remediation [11], or photochemical remediation [12]
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