TM 5-814-3/AFM 88-11, Volume III
7-3. Activated sludge process.
Figure 7-2 shows an activated sludge treatment process train which uses a closed-loop reactor. The reactor
is operated in the extended aeration mode. Duplicate or parallel treatment process trains are also applicable
for activated sludge treatment plants having design capacities equal to or greater than 0.1 million gallons per
day. A discussion of activated sludge plants can be found in chapter 13.