*From EPA Manual,
for Small Communities”
Office of Research and Development,
Office of Water,
Sequencing batch reactors (SBRs) have a long and successful history. They were operating long before flow-through, activated sludge systems were designed. In flow-based systems, variables in the flow can cause upsets and incomplete treatment. Because the SBR process is time-based rather than flow-based, there is much more control of the treatment process—both in multiple and single tank systems.
Here’s what the E.P.A. has to say: