A flotation system is used to thicken a clarifier underflow. The underflow has a flow rate of 100m3/hr and a solids concentration of 1kg/m3. Assume the underflow is saturated with air at 1atm gauge pressure (air solubility =22.4mg/L ). The system is operated in a non-recycle mode (direct pressurization of inflow). The system is capable of a maximum air flow of 5kg/h. The pressurization fractional efficiency =1. The relationship between A/S and float rise velocity for these underflow solids is given by the following empirical equation: Vt=15.(A/S)(Vtinm/h,A/Sinmg/mg) Determine the: i) air solid ratio (mg/mg), [3 marks] ii) surface loading rate (m3/m2.h), [3 marks] iii) minimum surface area of the flotation tank required to thicken the underflow (m2), iv) solid loading rate (kg/m2.h) and [3 marks] v) air flow required (kg/h) (check if can be supplied). [3 marks]