J Korean Soc Environ Eng. 2016; 38(1): 8-13.
Published online 2016 January 31.
Study on Removal of Cesium in Water Treatment System
Seoul Water Institute, Seoul Metropolitan Government
Received 2015 November 26; Accepted 2016 January 20.
ABSTRACT
This study investigated the removal of a radioactive cesium (Cs+) in the water at the water treatment processes. Since cesium is mostly present as the Cs+ ion state in water, it is not removed by sand filtration, and coagulation with polyaluminum chloride (PACl), powdered activated carbon (PAC) and mixture of PACl and PAC. However, it is known that the removal rate of cesium increases as the turbidity increases in raw water. As the turbidity was adjusted by 74 NTU and 103 NTU using the surrounding solids near G-water intake and yellow soils, removal rate of cesium was about 56% and 51%, respectively. In case of a GAC filtration with supernatants after jar-mixing/setting was conducted, 80% of cesium is approximately eliminated. The experimental results show that it is efficient to get rid of cesium when the turbidity of the raw water is more than 80 NTU. In case of a GAC filtration, about 60% of cesium is removed and it is considered by the effect of adsorption. Cesium is not eliminated by microfiltration membrane while about 75% of cesium is removed by reverse osmosis.
Keywords :
Cesium, Granular Activated Carbon, Turbidity, Reverse Osmotic Membrane
