An industry has decided to treat its process wastewater in a biotower with a plastic modular medium(n=0.6) the flow rate

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An industry has decided to treat its process wastewater in a biotower with a plastic modular medium(n=0.6) the flow rate of the wastewater is 1000 m^3/d with a BoD of 500 mg/L and an average temperature of 18c°
Q.5A) For the data in the table below, find.. 1- The chlorine dosage at the break point. 2- The chlorine dosage to achieve free residual chlorine of 0.3 mg/l. 3- The chlorine dosage to achieve total residual chlorine of 0.4 mg/l. 4- The free residual chlorine for chlorine dosage equal to 2 mg/l. Chlorine 0.3 0.9 0.6 1.2 1.5 1.8 2.1 dosage(mg/L) Residual 0.3 0.56 0.77 0.75 0.3 0.6 chlorine(mg/L) 0.9 2.4 1.2