Kaplanmış Seramik Membranla Rekabetli Ağır Metal Adsorpsiyonu ve Rejenerasyon Yöntemlerinin İncelenmesi

Abstract

In this study, active surface of ceramic membrane was modified with silica layer and amino groups in order to improve the treatability of industrial wastewater with heavy metal content. As the separation capabilities of the developed membrane increased, it became more selective for metal ions in industrial wastewaters. The modified membrane is characterized by SEM-EDX, membrane surface charge, and XRF measurements. The affinities and rejection capacities of heavy metals in industrial wastewater on the coated ceramic membrane were investigated at constant concentration and pressure (6.5 mg / L, 2 bar) with single, triple and 5-mixture model solutions. Then, 2 different regeneration methods were applied to the coated ceramic membrane. To determine the regeneration capacity of coated ceramic membrane with optimum regeneration method; 3 different pressures (1,2 and 4 bar) and 3 different concentrations (6,5, 64 and 128 mg / L) of copper containing model solution and industrial wastewater were tested and compared with the clean water flux after regeneration. In single experiments the removal order was obtained as Cu2+>Pb2+>Ni2+>Zn2+>Fe2+. In triple tests removal order of Pb2+>Ni2+>Cu2+ and Zn2+>Cu2+>Fe2+ was obtained. In the removal test where all metals are combined, the result was obtained as Pb2+>Ni2+>Zn2+>Cu2+>Fe2+ which is similar to the results of the studies in the literature. As a result of the tests performed, coated ceramic membranes were able to recover their initial performance after regeneration. ICP-MS analysis of the samples taken from the regeneration stream after coated membrane experiments 26,84-33,73 mg/L copper was found. By the multi-channel ceramic membrane tests which will be conducted in future studies, it is expected that the coating will strengthen the adsorption process by covering a larger surface area on ceramic membranes and reduce the process costs with obtained higher fluxes.