摘要
对采用自制气隙式膜蒸馏装置净化处理质量浓度为1g/L Sr2+和离子质量浓度均为10g/L的Co2+、Sr2+、Na+、Ca2+四种离子混合模拟放射性废水进行了研究。结果表明:膜蒸馏技术对1g/L Sr2+料液中Sr2+截留率可以达到99.999%以上,去污系数(DF)在105以上;处理离子质量浓度均为10g/L的Co2+、Sr2+、Na+、Ca2+四种离子混合料液时,膜蒸馏对Sr2+、Co2+截留率均接近100%,DF(Sr2+)达1×106,DF(Co2+)达1×107;料液温度和料液流速对膜通量有一定影响,无论是提高料液温度,还是增加料液流速,均可以有效提高膜通量。在保证净化效果的情况下,在料液温度75℃,料液流速7L/min时,处理1g/L Sr2+膜通量可以达到4.15kg/(m2·h)。对离子质量浓度均为10g/L的Co2+、Sr2+、Na+、Ca2+四种离子混合料液进行处理时,膜通量也达到3.88kg/(m2·h)。
Air gap membrane distillation was employed for the treatment of simulate radioactive wastewater including the simple ingredient, which contained only 1 g/L Sr^2＋ , and the complex ingredient that mixed Co^2＋ , Sr^2＋ , Na^＋ , Ca^2＋ with the mass concentration of 10 g/L, separately. The research results show that the desalination rates of Sr^2＋ in the simple ingredient of simulated radioactive wastewater achieve 99. 999 %, and the decontamination factor of which is more than 10s. The desalination rates of Sr^2＋ and Co^2＋ in the complex ingredient, which mixed Co^2＋ , Sr^2＋ , Na^＋ , Ca^2＋ , are all nearly 100%, and the decontamination factors of Sr^2＋ and Co^2＋ reach 1×10^6 and 1×10^7, separately. Enhancing the temperature and flow rate of feed can make contribution to an increase in the membrane flux, effectively. In the case that the temperature of feed is 75 ℃ and flow rate of feed is 7 L/min, the membrane fluxes are 4. 15 kg/（m^2· h） and 3.88 kg/（m^2· h） for the simple ingredient and complex ingredient simulated radioactive wastewater, respectively. The results in this work suggest that the membrane distillation as a novel technology will play an important role in the treatment of radioactive wastewater.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2015年第1期45-50,共6页
Journal of Nuclear and Radiochemistry
关键词
气隙式膜蒸馏
放射性废水
净化
air gap membrane distillation
radioactive wastewater
purification
