| 摘要 |
A process for separating an oil-in-water emulsion contained in a waste-stream comprises centrifuging 11 the stream so as to separate it into components consisting of dirty water which contains the oil-in-water emulsion, floating oil and settled solids, acidifying the dirty water by addition of CO 2 12a and mineral acid 12b and then centrifuging 13 the acidified mixture to separate the dirty water into oil, water and solid components. Preferably the acidification breaks the emulsion and precipitates minerals. Saturation of the dirty water with CO 2 may be accelerated by pumping the CO 2 into a number of diffusion chambers containing baffles (Fig 2), the CO 2 being pumped against the flow of the stream through these chambers. The mineral acid may be HCl, the HCl being pumped into a second set of diffusion chambers with baffles. The final product may be further cleaned using absorbent charcoal 14a,14b. |
