摘要
采用多级萃取-曝气蒸馏-非均相臭氧催化氧化联合工艺处理六氟磷酸锂高浓度有机废水,考察了该组合工艺处理该废水的可行性,探讨了多级萃取、曝气蒸馏等试验参数对处理效果的影响。结果表明,在萃取相与萃余相体积比为1∶10、3级萃取、每级萃取1.5 h的条件下,六氟磷酸锂废水COD的质量浓度从93440 mg/L降至2372 mg/L以下;再经过曝气蒸馏1 h后,馏出液与总溶液体积比为7.8%时,蒸馏后出水COD的质量浓度降至495 mg/L;曝气蒸馏出水再经过非均相臭氧催化氧化后,废水COD的质量浓度降至100 mg/L。该组合工艺对COD的去除率达到99.9%,预处理后的废水可满足后续处理单元的要求。
The combined process of multi-stage extraction-aerated distillation-heterogeneous ozone catalytic oxidation was used to treat high concentration organic wastewater from lithium hexafluorophosphate production.The feasibility of the combined process treating the said wastewater were investigated;besides,the influence of multistage extraction,aeration distillation and some other experimental parameters on treatment effect was discussed.The results showed that,when the volume ratio of extract phase to raffinate phase was 1∶10,the extraction time for each stage of three-stage extraction was 1.5 h,the mass concentration of COD in lithium hexafluorophosphate production wastewater decreased from 93440 to below 2372 mg/L.The mass concentration of COD in the effluent water decreased to 495 mg/L after 1 h of aerated distillation when the volume ratio of distillate to total solution was 7.8%.The mass concentration of COD in the effluent water from aeration distillation unit was reduced to 100 mg/L after heterogeneous ozone catalytic oxidation.The removal rate of COD by the said combined process reached 99.9%,and the pretreated wastewater could meet the requirements of subsequent treatment unit.
作者
李倩
曹意茹
张颖
王程程
赵曙光
宋乐山
LI Qian;CAO Yiru;ZHANG Ying;WANG Chengcheng;ZHAO Shuguang;SONG Leshan(Shenzhen Yonker Water Co.,Ltd.,Shenzhen 518000,China)
出处
《工业用水与废水》
CAS
2024年第1期27-30,共4页
Industrial Water & Wastewater
基金
湖南省科技创新重大项目(2021GK1010)
永清研发基金项目(YQ020821005)。
关键词
六氟磷酸锂
高浓度有机废水
多级萃取
曝气蒸馏
非均相臭氧催化氧化
lithium hexafluorophosphate production
high concentration organic wastewater
multi stage extraction
aerated distillation
heterogeneous ozone catalytic oxidation
