Enhanced removal of cesium by potassium-starved microalga, Desmodesmus armatus SCK, under photoheterotrophic condition with magnetic separation.
This study investigated the feasibility of using photoheterotrophic microalga, Desmodesmus armatus SCK, for removal of cesium (Cs+) followed by recovery process using magnetic nanoparticles. The comparison of three microalgae results indicated that D. armatus SCK removed the most Cs+ at both 25 °C and 10 °C. The results also revealed that the use of microalga grown in potassium (K+)-starved condition improves the accumulation of Cs+. Heterotrophic mode with addition of volatile fatty acids (VFAs), especially acetic acids (HAc), also enhanced removal of Cs+ by K+-starved D. armatus SCK; maximum removal efficiency of Cs+ was almost 2-fold higher than that of cells grown without organic carbon source. The Cs+ taken up by this microalga was efficiently harvested using magnetic nanoparticles, polydiallyldimethylammonium (PDDA)-FeO3. Finally, this strain eliminated more than 99% of radioactive 137Cs from solutions of 10, 100, and 1000 Bq mL-1. Therefore, use of K+-starved microalga, D. armatus SCK, with VFAs could be promising means to remove the Cs from the liquid wastes.
['Kim|Ilgook|I|', 'Choi|Gang-Guk|GG|', 'Nam|Seung Won|SW|', 'Yang|Hee-Man|HM|', 'Park|Chan Woo|CW|', 'Seo|Bum-Kyoung|BK|', 'Choi|Kyoung-Min|KM|', 'Park|Sang-Min|SM|', 'Ryu|Byung-Gon|BG|']
D002586:Cesium D002588:Cesium Radioisotopes D005232:Fatty Acids, Volatile D052836:Heterotrophic Processes D060328:Magnetic Phenomena D058086:Microalgae D011188:Potassium D014874:Water Pollutants, Chemical
Cesium Microalgae Magnetic separation Volatile fatty acid Potassium starvation