parex1 at vianet.on.ca
Tue Nov 7 10:03:25 EST 1995
I am a layperson in this subject so forgive any biological inaccuracies
A problem with the local municipal sewage water treatment plant is
occurring in my area and an organism they said had been identified as
"nocardia filamentous bacteria" is the culprit. The effect the
organism's growth has is to cause a brownish foam several inches thick to
appear on the surface of the water in the clarifier tanks which is a
final stage of the water treatment process. The surface skimming rakes
that the tanks are equipped with are not designed to handle this
thickness and consistency of foam. The net result is foam carryover into
the effluent stream. This is environmentally unacceptable and they are
looking at remedial measures such as physically removing the foam using
vacuum trucks on a temporary basis and improved surface skimming
equipment for the long term.
The problem has been a recurring one over the last ten years and is as
bad as it has ever been right now. The plant operators have not been
able to establish a cause and effect relationship to explain this
phenomena. A mechanism that was described is that this bacteria attaches
itself to oil and\or grease and floats it to the surface. The plant has
a high throughput and the sewage has a short residence time.
My focus is to attempt to identify the root cause of the problem.
Presumably this bug is always present and will grow to objectionable
levels only under certain conditions.
Am I in the right newsgroup?
Has anyone seen this sort of effect in a sewage treatment plant and was
the root cause identified?
Are there certain compounds in the sewage water entering the plant that
would cause this organism to proliferate?
Could waste water from petroleum refining which may contain miscellaneous
trace amounts of hydrocarbon compounds create favourable growth
conditions for this organism?
Any tips on other questions jor things I should be considering?
Any references to other souces of information would be appreciated!
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