Aerators And Aerobic
Digestion
Aerators Enhance Aerobic Digestion
Process
By
Larry Moore; Charles Van Zandt
The city of Eden, N.C.,
operates an extended aeration process designed for an average flow rate of 13.5
mgd with a mixed liquor suspended solids concentration that typically checks in
about 6,000 mg/l.
This
high biomass concentration is necessary to provide a well-settling sludge and
good effluent quality.
Further, the plant influent
is approximately 40% domestic wastewater and 60% industrial wastewater.
The industrial component is
dominated by textile facilities.
The Eden Wastewater Treatment
Plant (WWTP) generates about 20,000 lb per day of waste activated sludge
solids, which are aerobically digested prior to storage in sludge lagoons and
ultimate land application.
For
many years, the facility has had difficulty maintaining adequate dissolved
oxygen levels and adequate mixing in its aerobic digester.
However, this all changed
when the plant installed four new floating brush rotor aerators in May 2004.
Aerators Enhance
Aerobic digestion is a sludge stabilization process designed to convert waste activated sludge solids to carbon dioxide, water, residual cell debris and other end products.
Aerobic digestion is a sludge stabilization process designed to convert waste activated sludge solids to carbon dioxide, water, residual cell debris and other end products.
The
oxidation of cellular material is referred to as endogenous respiration and is
typically the dominant reaction in aerobic digestion.
The detention time in the
digester is normally about 20 days to achieve satisfactory solids
stabilization.
Additionally,
the primary functions of an aerobic digester are to reduce odors, reduce
biodegradable solids content, to prepare the sludge for ultimate disposal on
land consistent with Federal 503 regulations.
Aerobic digestion stabilizes
the sludge solids more rapidly than anaerobic digestion, even though a less
complete breakdown of cells is typically achieved.
Oxygen can be supplied by
mechanical aerators or by diffused aeration.
At
the Eden WWTP, vertical surface aerators have been used for many years. Plant
personnel have had serious concerns because of operating problems as well as
poor process performance.
Prior to installation of the
new floating brush rotor aerators, the plant had 145-hp of vertical aeration
equipment in the aerobic digester.
The vertical aeration
equipment consisted of three 40-hp units and one 25-hp unit.
In
aerobic digestion, it is desirable to maintain at least 1.0 mg/l dissolved
oxygen level to provide an efficient aerobic environment.
Typical dissolved oxygen
concentrations were 0.0 mg/l, which led to odor problems and poor aerobic
digester performance.
In
addition, it is extremely important to provide adequate mixing to keep the
waste solids in suspension.
Typically, one-third of the
aerobic digester was never mixed, creating dead zones detrimental to aerobic
digestion.
Moreover, it usually required
two to three days of settling to facilitate efficient decanting of supernatant
prior to wasting sludge to the sludge storage lagoons.
Consequently, the aerobic
digestion process performed below expectations and created operating problems
for the WWTP staff.
https://www.wateronline.com/doc/aerators-enhance-aerobic-digestion-process-0001
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Biological Oxygen
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