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RE: Odor prevention at a lift station


It sounds like the wastewater is going septic which will generate H2S and
other noxious odors.  Maskants only cover up the smell and are a poor
solution.  The most direct solution is to eliminate all dead spots in the
upstream sewer.  Flowing waste is much less likely to go septic.  However,
retrofitting the sewer can be very expensive.

Installing an air sparger or injecting hydrogen peroxide at several points
along the line might solve the problem.  There are also chemical deodorizers
that are claimed to work.  Odor Management Inc., Nalco Chemical, and NuTech
have web sites that discuss their product lines.  I just prepared a study on
odor control associated with the excavation of contaminated soils and there
is a ton of info on the net regarding available products (I know, buyer

In addition to deodorizers, pH control can be used to minimize odors from
sewers.  Thioguard, from Premiere Chemicals, is a solution of magnesium
hydroxide that can maintain pH in the 8 to 8.5 range.  At a pH less than 6,
sulfides are present as H2S.  At a pH greater than 9, ammonia may form and
excessive sludge may precipitate.  The use of Thioguard is also reported to
minimize the damage to concrete sewers caused by the H2S.

Hope this helps.

> ----------
> From: 	Tammy Allen[SMTP:tallen@co.pinellas.fl.us]
> Reply To: 	Tammy Allen
> Sent: 	Friday, January 22, 1999 10:56 AM
> To: 	p2tech@great-lakes.net
> Subject: 	Odor prevention at a lift station
> Can anyone suggest how to reduce the odors at a waste water lift station
> located in a residential area.  Maskants have proved costly and
> ineffective at preventing odors.  Any one know of anything innovative
> and inexpensive for this municipal sewer system.  Any help will be
> greatly appreciated.
> Tammy L. Allen, Senior Environmental Specialist
> Pinellas County Environmental Management