Here are the answers to the July 14, 2020 edition of TPO's Exam Study Guide:

1. Membrane Bioreactors (MBR’s) are becoming a viable option for retrofitted waste treatment facilities or built from ground up facilities. What are the two types of MBR layouts commonly used?

The answer to this question is B, sidestream and inline (submerged). 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. Understanding different types of waste treatment processes are important for the operator’s knowledge.

2. What is most likely to occur if a chlorine cylinder is stored in a room containing temperatures near 160 degrees Fahrenheit?

The correct answer is B, the fusible plug(s) will melt allowing chlorine gas to escape. Chlorine stored inside steel cylinders expands as temperatures rise creating excessive internal pressures. The melting of the fusible plug(s) on a chlorine cylinder allows for a more controlled release of excessive pressure from chlorine gas. Fusible plugs melt at around 160 degrees Fahrenheit and are equipped on 150-pound cylinders and one-ton cylinders. The fusible plug on a 150-pound cylinder is located on the valve underneath the valve seat and a one-ton cylinder has three fusible plugs on each end.


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