Question 1 If the waste with BOD4-30 equal 150 mg/l and K1-20 0.23/day is discharge to a stream At an average temperature 30 C.0 = 1.047 A. compute the BOD would de exerted in 5 days at temperature 20 and 30 C (BODS-30, BODS-10). 8. compute the organic loading in (kg/day) for BOD 5-20 lf the flow rate 35 m3/1 Question 2 if the waste with ultimate BOD, equal 190 mg/L and K 1-20 0.23/day is discharge to a stream at an average temperature 25°C. a. compute the BOD would be exerted In 3 and 5 days at temperature 20 and 25° C, (BOD3-20), BOD 5-20, (BOD 3-25 ), BOD -25 ? b.compute the organic loading in (kg/day) for BOD 5-20 If the flow rate 50 m3/h? Question 3 بحبواب uses a single stage rock-media trickling filter for Secondary treatment, A wastewater treatment plant flow rate 2000m3/day concentration of BOD in raw sewage = 400 mg/! 30% BOD removed in primary sed. volume of filter = 169.65 m3. direct recirculation pump operates at 2.78 m3/min to the filter fined the efficiency of T.F and the total efficiency?