Effects of operating parameters on efficiency of lead removal by complexation-microfiltration process

Abstract

Majority of lead content found in the environment is the result of human activities. Heavy metals can be hazardous because they tend to bioaccumulate. Complexation-microfiltration process for the removal of Pb(II) ions was studied. The aim of microfiltration of the model wastewater containing heavy metal ions was finding an optimum ratio between the concentrations of the complexing agent and metal, and determining the most favorable pH value. The microfiltration experiments were carried out in a stirred dead-end cell. Diethylaminoethyl cellulose (DEAE 23) was selected as the complexing agent. Versapor membranes were used to separate formed polymer-metal complex. The concentration of heavy metal ions after microfiltration in aqueous solution was determined using the atomic absorption spectroscopy (AAS). Effects on the amount of complexing agent, concentration of metal ion, pH value and operating pressure on the flux, J, and rejection coefficient, R, were investigated. Experimental results indicate that the pH of the solution has considerable influence on the rejection coefficient. An increase in pH and the amount of complexing agents enabled us to obtain very high retention coefficient (99%)

Lead ions removal from aqueous solution in a novel bioelectrochemical system with a stainless steel cathode

“…Lead, which is widely used as an industrial raw material for battery manufacturing, acid metal plating and nishing, ammunition, tetraethyl lead manufacturing, ceramic and glass industries printing, and the painting and dying industry, 1,2 has been considered as one of the most toxic contaminants discharged into the environment requiring urgent and intensive monitoring and strong policies. 3 It is reported that lead is nonbiodegradable and toxic to human beings, especially children.…”

Optimization of the arsenic removal process from enargite based complex copper concentrate

“…The available literature in this area is mainly based on the study of the chalcopyrite behavior [14][15][16], while the enargite characteristics have not been widely investigated. Recently, research aims have been directed to determining the influence of different leaching media on the arsenic utilization from copper ores and concentrates [2,4,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”