천연제올라이트를 이용한 고농도의 칼슘이온 제거:이온교환속도 및 이온교환능

Abstract

The concentrated calcium removal from industrial wastewater by natural zeolite was examined to reduce inhibitory effects of those ions on the biological treatment in down-stream. It is well known that natural zeolite possesses good cation exchange capacity. Kinetic studies by using a batch-type methods demonstrated that the adopted particle size(1-2, 2-2.8, 2.8-4mm) of zeolites showed similar exchange trends of calcium ions and showed relatively fast exchange reaction within 1 hour in spite of various zeolite dosages. The influence of the temperature on the ion-exchange capacity (isotherm) was examined. It was found that calcium exchange capacity(4.464 mg-Ca2+/g-zeolite) at low temperature of 5℃ was double up to 9.225mg -Ca2+/g-zeolite at the range of 22-40℃. However, ion exchange efficiencies were similar at each condition of pH 6, 7, 8, 10.