2-Methylisoborneol (MIB), a metabolite of algal production, is a common taste- a

Question

2-Methylisoborneol (MIB), a metabolite of algal production, is a common taste- and odor-causing compound in surface waters. Adsorption on activated carbon is one treatment option. A series of batch adsorption equilibrium tests were performed using powdered activated carbon (PAC) as the sorbent. Plot the data according to the Langmuir isotherm. The water of the foul smelling Reservoir has an MIB concentration of 1.5 mg/L. The treated water is to have a MIB concentration of 0.030 mg/L. a. Determine if the desired effluent quality can be achieved by adsorption. b. Determine the adsorptive capacity (q_c) of the carbon at this level of effluent quality. c. Determine the dose of PAC required to treat a demand of 0.15 m^3/s of this water.

Explanation / Answer

Folowing is the equation for determining the adsorption phase concentration, or amount of adsorbate (mg) per gram of adsorbent:

qe = (C0 – Ce)V/m

Where qe = the adsorbent phase concentration after equilibrium (mg adsorbate/g adsorbent)

C0 = the initial concentration of the adsorbate (mg/L)

Ce = the equilibrium concentration of the adsorbate after adsorption has occurred (mg/L)

V = the volume of liquid in the reactor

m = the mass of the adsorbent (g)

Accordingly we need to generate qe for each flask of foul water and the following table is generated:

1.47

From the table:

Answer for question (a): Yes. The desired effluent quality can be achieved by using 1.47 g of PAC for 1 L of effluent (Row 8).

Answer for question (b): Adsorptive capacity (qe): 1.47 mg MIB/g PAC/L Effluent water

Answer for question (c): Final effluent is contaminated with 1.5 mgL of MIB. From question (b) we know 1 g PAC required to remove 1.47 mg/L. So to remove 0.15 m3/s it requires 220 mg of PAC.

S no Initial MIB, C0, mg/L Equilibrium MIB, Ce, mg/L PAC Dosage, mg/L PAC Dosage, g/L qe 1 1 0.01 20 0.02 49.5 2 1 0.05 10 0.01 95 3 1 0.1 7 0.007 128.6 4 1 0.5 2 0.002 250 5 5 1 10 0.01 400 6 5 2 6 0.06 50 7 5 3 5 0.05 40 8 1.5 0.03 1

1.47

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