Problems

8.1 A wastewater containing a [Co] = 25 mg/L of phenol is to be treated using PAC to produce an effluent concentration [C]f = 0.10 mg/L. The PAC is simply added to the stream and the mixture subsequently settled in the following sedimentation tank. The constants of the Langmuir equation are determined by running a jar test producing the results below. The volume of waste subjected to each test is one liter. If the flow rate Qo is 0.11 m /s, calculate the quantity of PAC needed for the operation. What is the adsorption capacity of the PAC? Calculate the quantity of PAC needed to treat the influent phenol to the ultimate residual concentration. Use the Langmuir isotherm.

8.2 Solve Problem 8.1 using the Freundlich isotherm.

8.3 A wastewater containing a [Co] = 25 mg/L of phenol is to be treated using PAC to produce an effluent concentration [C]f = 0.10 mg/L. The PAC is simply added to the stream and the mixture subsequently settled in the following sedimentation tank. The constants of the Langmuir equation is determined by running a jar test producing the results below. The volume of waste subjected to each test is one liter. If the flow rate Qo is 0.11 m /s, calculate the quantity of PAC needed for the operation. What is the adsorption capacity of the PAC? Calculate the quantity of PAC needed to treat the influent phenol to the ultimate residual concentration. Use the Langmuir isotherm.

8.4 Solve Problem 8.3 using the Freundlich isotherm.

8.5 A wastewater containing a [Co] = 25 mg/L of phenol is to be treated using PAC to produce an effluent concentration [C]^ = 0.10 mg/L. The PAC is simply added to the stream and the mixture subsequently settled in the following sedimentation tank. The constants of the Langmuir equation are determined by running a jar test producing the results below. The volume of waste subjected to each test is one liter. If the flow rate Qo is 0.11 m /s, calculate the quantity of PAC needed for the operation. What is the adsorption capacity of the PAC? Calculate the quantity of PAC needed to treat the influent phenol to the ultimate residual concentration. Use the Langmuir isotherm.

8.6 Solve Problem 8.5 using the Freundlich isotherm.

8.7 A breakthrough experiment is conducted for phenol producing the results below. The length of the active zone is calculated to be 5.1 mm. The diameter of the column used is 2.5 cm, and the packed density of the bed is 721.58 kg/m (XIM)ult = 0.020 kg/kg. Calculate the influent phenol concentration.

C (mg/L)

V (L)

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