85. For the reuse of waste water, the content of phenol in them must be reduced to 0.5 kg/m3. Is a 4-fold treatment of 10 m3 of these waters with benzene sufficient for this, if each time 1 m3 of fresh extractant is used, and the initial content of phenol in the waste water is 8 kg/m3. The distribution coefficient of phenol in the water-benzene system is 0.2.
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