1) Design a UASB reactor to treat wastewater at 30°C from a food processing plant. The wastewater fow rate is 500 m3/d with a soluble COD concentration of 6000 mg/L. The design parameters are as follows: Reactor effectiveness factor (E) = 0.85 Upfow velocity = 1.2 m/h Organic loading rate = 12 kg sCOD/m3 ·d Y = 0.08 kg VSS/kg COD kd = 0.03 d–1 μmax = 0.25 d–1 Ks = 360 mg/L Height for gas collection = 3 m Using the given information, determine the following: a. The reactor area and diameter b. The reactor liquid volume c. Liquid depth and total height of the reactor d. The average SRT (assuming 97% degradation of sCOD) 2) Determine the methane gas production rate (m3/d) for the reactor from problem 1) Assume COD equivalent of VSS equals 1.42 kg COD/kg VSS.
1) Design a UASB reactor to treat wastewater at 30°C from a food processing plant. The wastewater fow rate is 500 m3/d with a soluble
COD concentration of 6000 mg/L. The design parameters are as
follows:
Reactor effectiveness factor (E) = 0.85
Upfow velocity = 1.2 m/h
Organic loading rate = 12 kg sCOD/m3 ·d
Y = 0.08 kg VSS/kg COD
kd = 0.03 d–1
μmax = 0.25 d–1
Ks = 360 mg/L
Height for gas collection = 3 m
Using the given information, determine the following:
a. The reactor area and diameter
b. The reactor liquid volume
c. Liquid depth and total height of the reactor
d. The average SRT (assuming 97% degradation of sCOD)
2) Determine the methane gas production rate (m3/d) for the reactor
from problem 1) Assume COD equivalent of VSS equals 1.42 kg
COD/kg VSS.
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