Biofilm kinetics. You want to investigate the possibility of treating an industrial wastewater under aerobic conditions in a biofilm reactor. From your own data gathering and the literature, the following parameters are available:

Q = 1,100 m3 /day

So = 300 mgBODL/liter

a = 75 m-1

qmax = 1.5 mgBODL/mgVSS-day

Ks = 20 mgBODL/liter

D = 1.37 cm2 /day

Df = 1.10 cm2 /day

Xf = 150 mgVSS/cm3

Y = 0.4 mgVSS/mgBODL

b = 0.1 day-1

L = 0.002 cm

Calculate the volume of a completely mixed biofilm reactor needed to achieve a 95% reduction in BODL.