Question: - [15 marks It is decided to design a dissolved air flotation tank to concentrate 3200 mg/l of mixed liquor suspended solids (MLSS) of an

- [15 marks It is decided to design a dissolved air

- [15 marks It is decided to design a dissolved air flotation tank to concentrate 3200 mg/l of mixed liquor suspended solids (MLSS) of an activated sludge plant to about 4 wt%. The following data are available: Sludge flowrate (Q) = 375 md Air solubility (sa) at 20C temperature = 18.7 mL air/ L liquid - Air to solid ratio (S/A) = 0.01 mg/mg - Fraction of saturation (f) = 0.6 Surface loading rate (SLR) = 10 L/m. min - Recycle flow (R) = 415 m/ - Solids loading rate must be: 0.1 to 1 kg/m.h (rule of thumb). Determine: [6 marks] i) The gauge pressure in kPa for recycled flow, [5 marks] ii) The surface area of the tank in m' and [4 marks] iii) The solids loading rate in kg/m'.h (check for applicability)

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