| 摘要 |
<p>A plant for treatment of a waste water stream comprising fat includes a pre-treatment apparatus, such as a skimming tank 1, for removal of liquid oil and gross contaminants to provide a remaining aqueous dispersion; a flow-through assembly 13, 14 for electrocoagulation treatment comprising opposed electrodes and sacrificial electrodes therebetween; a floc-separation apparatus 15, such as a settling tank, arranged for removal of a flocculated fat-containing layer from the aqueous dispersion to provide a clarified aqueous solution 17; and a controller 10 arranged to control voltage and/or current across the electrodes. Suitably, the pre-treatment apparatus comprises a screening apparatus 6 for removal of coarse particles from the waste water. A pressure tank 23 may be arranged for dissolving pressurised gas into aqueous solution, and the plant also comprises a pump P26 arranged for blending the solution of gas with the aqueous dispersion through a valve 31. The valve may be arranged to maintain the solution of gas at a pressure higher than atmospheric pressure, prior to blending. Also disclosed are methods for using the plant to provide efficient separation with minimised power consumption as flow and contaminant levels vary.</p> |
