2. Revertex Treatment Plant processes an average flow of 5500m3/d, with a peak flow 2 times the average. The wastewater contains 200mg/BOD5 and 380mg/l of suspended solid at pek flow. The process takes place in a primary clarifier of a long rectangular basin (L=3W). After primary treatment, the wastewater treatment will undergo secondary treatment process. a) Determine the approximate removal efficiency for BOD5 and suspended solid for both average and peak flow. (7 marks)