Question

. A wastewater containing 50 mg/L of phenol was subjected to an equilibrium

test to determine the constant in the Langmuir isotherm. One-liter samples
were dosed with powdered activated carbon (PAC) in four jars, and when
equilibrium was reached the equilibrium concentrations of phenol were
analyzed.
a) From the results shown below, determine the Langmuir isotherm’s
constants.
b) If the wastewater with a flow rate of 0.10 m3/s containing 50 mg/L of
phenol is to be treated using PAC to produce an effluent concentration
of 0.10 mg/L, calculate the quantity of PAC needed for the operation?

Answer 1

Step 1: Determine the constants a and b in the Langmuir Equation.

a = 6.0 g/L

b = 1.783 g/L

Step 2: Calculate the dosage required to yield an effluent with a phenol concentration of 0.10 mg/L.

dosage = (2 * 6.0) + (1 * 1.783) = 11.83 g

Step-by-step explanation: