10.For an adsorption column, the adsorbent is changed when 35mg / litre concentration is detected in effluent. Originally detection of 3% concentration was decided as the breakthrough point. Determine the feed concentration of pollutant that has to be maintained to operate as stated above. For breakthrough time of 160 minute, calculate the approximate velocity of mass transfer zone if total length of bed is 10m. Assume that thickness of mass transfer zone is negligible compare to the height of the bed