An industrial facility is discharging 0.022 m^3/sec of wastewater into a nearby

Question

An industrial facility is discharging 0.022 m^3/sec of wastewater into a nearby river. The wastewater contains a monthly average cyanide concentration of 1.10 mg/L. a. Calculate the mass discharge rate in kg/day. b. If the facility is permitted to discharge 3.0 kg/day of cyanide, is the facility in compliance with its permit? Ans: a) 2.1 kg/day The concentration of ozone (O_3) in air in Denver on a summer day was measured 0.2 mg/m^3. a. Calculate the equivalent concentration of O in mL/m^3 and ppm_v. (Assume an air temperature of 25 degree C and an air pressure of 1 atm.) b. Calculate the equivalent concentration of O_3 in m/m^3 and ppm_y for the actual conditions (T = 25 degree C: P = 0.82 atm). c. Does the measured concentration of O_3 meet or exceed the 8-hour National Ambient Air Quality Standard for ground-level ozone of 0.08 ppm_v. Briefly explain. Ans: a) 0.102 mL/m^3: 0.102 ppm_v: b) 0.124 mL/m^3: 0.124 ppm_v Calculate the mass of the following gases at 25 degree C and 1 atm total pressure: a. 1.0 L of helium gas, He(g). b. 1.0 L of chlorine gas, Cl_2(g). c. 1.0 L of air. d. Based upon your answers, explain why a balloon filled with helium rises and why leaks of chlorine gas can be hazardous to people in low-lying areas or basements. Ans: a) 0.16 g: b) 2.9 g: c) 1.18 g

Explanation / Answer

Ques no.2:

a)the mass discharge rate=0.022(m3/sec)*103(L/m3)*(24*60*60 sec/day)*1.1 (mg/L)*(10-6 kg/mg)=2.1 kg/day

b) The threshold limit is 3 kg/day so it is safe to discharge.

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