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　　Nano micro bubble technique：Being used as carriers, the highly dispersed nano scale bubbles can adhere to the wax and oil in waste water, making floatage of wax and oil greater than their gravity and resistance force, so as to separate the wax and oil from water. We have applied this technique in the washing waste water(wax &oil) treatment for BMW and also the oilcan cleaning waste water treatment for a oil product storage company in Liaoning province, and have made a great success.