WASTEWATER
By Rick Lallish
Membrane bioreactors are becoming a viable option for retrofitted waste treatment facilities or newly built facilities. What two types of MBR layouts are commonly used?
A. Inward and outward
B. Sidestream and inline (submerged)
C. Aerobic and anaerobic
D. Microfiltration and ultrafiltration
Answer: B. MBR technology is a combination of activated sludge and fixed-film processes. It uses a membrane filtration unit to perform the solid-liquid separation instead of a secondary clarifier. There are two types of layouts, sidestream and inline. Sidestream uses the process in a separate tank, and the inline units are placed directly in the aeration basin. More information can be found
