Abstract: Cyclone dissolved air floatation technology combines cyclone centrifugal separation technology with dissolved air floatation separation technology, adopts special equipment structure, improves efficiency of dissolving air and produces smaller microbubbles (particle size 5~30 μm), which has high oil and slag removal effect. The application of CDFU (cyclone dissolved air floatation unit) in the salt-containing waste water pretreatment unit realizes long-term stable operation and up to standard discharge. The oil removal rate is 73.6%, the slag removal rate is 71.66%, the COD (chemical oxygen demand) is reduced by 32.7%, and the quality of salt-containing waste water is significantly improved. It can also reduce the content of combustible gas and hydrogen sulfide in salt-containing waste water, reduce the impact on the downstream, and eliminate potential safety hazards.

Key words: cyclone dissolved air, electric desalting, salt-containing waste water, flash tank, two-stage air floatation, petroleum, suspended solid, COD

摘要： 旋流溶气气浮技术将旋流离心分离技术与溶气气浮分离技术结合，采用特殊的设备结构，提高溶气效率，能产生更小的微气泡（粒径5～30 μm），具有较高的除油、除渣效果。CDFU（高效旋流溶气气浮装置）在含盐污水预处理装置应用，能实现长期稳定运行，并达标排放，除油率73.6%，除渣率71.66%，COD(化学需氧量)降低32.7%，含盐污水水质明显改善,且可降低含盐污水中可燃气体和硫化氢含量，减少对下游影响，消除安全隐患。

关键词: 旋流溶气, 电脱盐, 含盐污水, 闪蒸罐, 两级气浮, 石油类, 悬浮物, COD