| Using quartz sand, PP grain and defatted walnut grain with diameter in the range of 3-4 mm as granular coarse-grained materials, the effects of different materials on the separation of emulsified waste cooking oil were researched. Through controlling the flow direction, flow rate, temperature and filler height, the removal effects of emulsified waste cooking oil of the three granular coarse-grained materials under different conditions were obtained. The results showed that bottom-up flow was more beneficial to the removal effect of emulsified waste cooking oil of granular coarse-grained materials; rising temperature was not conducive for the increases of removal rates of oil and CODCr, and they were negative correlated; improving flow rate could reduce the removal rates of oil and CODCr; with filler height increasing, the removal rates of oil and CODCr first increased then decreased; under the conditions of bottom-up flow, flow rate 50 L/h, temperature 40[KG-*8]℃ and filler bed height 20 cm, the best separation effect could be achieved；the removal rate of oil of granular coarse-grained materials gradually reduced with utility time prolonging, while the hydrophilic granular coarse-grained materials, defatted walnut grain and quartz sand, could restore good oil removal effect after back-washing by high speed water. |
