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FGR-SGR process in Salmon
Arm, BC
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Clarifier
in Salmon Arm
Click
on photos to view
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Why use trickling filters for biological
nutrient removal?
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Existing trickling filter plants can be
retrofitted for biological nutrient removal with maximum use of existing
facilities;
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Chemical precipitation of phosphorus in
trickling filter plants increase operation costs (from purchase and shipping
of chemicals) and produces larger waste solid volumes than biological
phosphorous removal;
-
Cascade aeration of the mixed liquor
over Trickling filter media for phosphorus uptake and nitrification is less
energy intensive than compressed air for diffused-air-activated sludge;
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The fixed growth bio-film attached to
the trickling filter media cannot be "washed out" by hydraulic
shocks - nitrification and BOD removal continue even if the suspended growth
is washed out;
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The long hydraulic detention time
required in the aeration basin for nitrification in activated sludge systems
is eliminated - the aeration basin size can be optimized for phosphorus
removal only;
- The long sludge age required in
activated sludge systems (and associated poor settling bio-mass) is
eliminated - trickling filters, followed by a short contact period for flocculation,
produces an excellent settling bio-mass.
For more information please contact:
Harlan Kelly (hkelly@dayton-knight.com).
P.E, P.Eng
or
John Boyle (jboyle@dayton-knight.com)
P.Eng.
or
Al Gibb (agibb@dayton-knight.com)
Ph.D, P.Eng
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