title: Treatment of radioactive wastewater using direct contact membrane distillation.
abstract: Direct contact membrane distillation (DCMD) was used to treat low level radioactive wastewater (LLRW). The dusty gas model (DGM) was used to analyze the mass transfer mechanism and calculate the permeate flux. The operating parameters such as feed temperature, feed velocity and feed concentration were studied. The experimental results showed that DCMD process can separate almost all Cs(+), Sr(2+) and Co(2+) from wastewater. The permeate flux decreased linearly when NaNO3 concentration increased from 1.0 to 200 g/L. The permeate flux remained about 60% of its initial flux even when NaNO3 concentration in feed solution was as high as 200 g/L. The dusty gas model can be successfully applied to estimate the mass transfer, and the experimental permeate flux values fitted well with that calculated by DGM. DCMD is a promising separation process for low level radioactive wastewater treatment.
authors: Laboratory of Environmental Technology, Institute of Nuclear and New Energy Technology (INET), Tsinghua University, Beijing 100084, PR China.
authors: Haiyang
authors: H
authors: Liu
authors: Jianlong
authors: J
authors: Wang
mesh_terms: D002588:Cesium Radioisotopes / Q000737:chemistry; D003037:Cobalt Radioisotopes / Q000737:chemistry; D057168:Distillation; D008567:Membranes, Artificial; D008962:Models, Theoretical; D009566:Nitrates / Q000737:chemistry; D013326:Strontium Radioisotopes / Q000737:chemistry; D062065:Wastewater; D014875:Water Pollutants, Radioactive / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D002588:Cesium Radioisotopes; D003037:Cobalt Radioisotopes; D008567:Membranes, Artificial; D009566:Nitrates; D013326:Strontium Radioisotopes; D062065:Wastewater; D014875:Water Pollutants, Radioactive; C031618:sodium nitrate
keywords: Membrane distillation; Membrane separation; Radioactive wastewater; Radionuclides