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Report to Congress
by the
Comptroller
General
of the
United States
Activated Sludge Sewage
Treatment Plants
vs.
RBC Sewage Treatment Plants
In May 1975, the Comptroller General presented to the U.S. Congress a
report dealing with a program to reduce the costs of wastewater treatment
plants that are funded by the government.
The report included a value analysis which compared the costs of an
activated sludge process with an rotating biological contactor (RBC) process for a flow of
4.5 million GPD.
The conclusions were that the RBC
option would result in
capital savings of 44.2% plus
annual operation, maintenance and replacement savings of $43,600 per annum.
The report said:
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"The rotating
biological contactor process utilizes oxygen from the air without the
need for mechanical aeration mixing as required in the activated sludge
process. If rotating biological contactors are utilized, a significant
number of process components required in the activated sludge process
can be eliminated. These include the aeration tanks, blowers, blower
building, and large quantities of piping. In addition, power consumption
would be reduced and overall operating costs considerably lowered."
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