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Poultry Processing Wastewater Treatment System
Process Description
Poultry processing plants, as in many other
food processing activities typically are high water users. For
broilers, 5 to 10 gallons of water are used to process one 5 pound,
average-sized chicken. When processing turkey the volume of water is
even higher with average weight of slaughtered turkeys exceeding 4
times that of a chicken. It is not unusual for a typical poultry
processor to generate 1,000,000 to 1,500,000 gallons of wastewater
daily.
This water will be laden with fats, proteins
and carbohydrates from meat, fat, blood, skin and feathers. The
water is also polluted with a fair amount of grit and other
inorganic matter. Waste load can be determined by a number of
different measurements, including BOD (biochemical oxygen demand),
TSS (total suspended solids concentration), COD (the chemical oxygen
demand), and FOG (fats, oil and grease), but poultry plant
wastewater is most often tested for BOD which is a measure of the
amount of oxygen needed to degrade the organic matter (feathers, fat
and blood) in the wastewater.
Poultry processing plants are required to
remove the majority of all soluble and particulate organic material
in their generated wastewater prior to any discharge from the plant.
This process needs to take place in order for the plant to be in
compliance with local, state and federal environmental regulations.
Hydro-Flo Technologies custom configures a
full treatment system that can screen and treat the wastewater to
discharge levels that meet or often exceed local municipal
requirements. Please review further our current offerings for the
poultry industry and contact us today to learn more about solutions
we can offer your business.
The typical method to treat Deli Meats
Processing wastewater is as follows:
Stage 1 Emulsion Cracking/pH Adjustment:
pH is lowered to ~3.5 with the pH
controller using acid. A coagulant de-emulsifier is added to break
any emulsion.
Stage 2 pH Adjustment/Precipitation and Coagulation:
pH is adjusted to ~8.5 using caustic
and a coagulant is added such as Alum or PAC to cause further
de-emulsification and precipitation of the solids. A “pin floc” is
developed indicating the emulsion and the suspended solids are
precipitated.
Stage 2 - Flash Mix:
The wastewater with it’s precipitated
pin floc is introduced to the flash mix zone where a polymer
flocculent is added. This stage maximizes flocculent dispersion
throughout the coagulated wastewater.
Stage 3 - Flocculation:
The wastewater is now introduced to the
slow mix zone to agglomerate the floc into larger particles suitable
to be enmeshed with the air bubbles.
Clarifier, Dissolved Air Flotation (DAF):
The flocculated wastewater is introduced
into the DAF inlet where the floc particles are comingled with a
pressurized dissolved fine bubble recycle stream. The floc
particles attach to the bubbles and float to the surface where they
are mechanically skimmed into the float scum sludge chamber. The
clarified treated water then exits the end of the DAF and flows
downstream to sewer or further treatment if necessary. The DAF
system bubbles come from a Recycle Air Dissolving system that takes
a portion of treated effluent, pressurizes it and introduces air to
be dissolved. The dissolved air comes out of solution and forms a
fine bubble stream when the pressure is released at the DAF entrance
in the presence of floc wastewater.
DAF
Sludge Handling:
The resulting DAF waste scum/sludge is
removed from the DAF automatically as the scum accumulates and is
pumped to the sludge holding tank where it further thickens and
accumulates a batch for disposal or processing in a filter press.
The sludge is mixed and conditioned with a filter aid such as DE to
improve porosity and filterability.
Sludge Dewatering:
The thickened DAF scum/sludge is
allowed to accumulate sufficiently to provide a full batch for the
Filter Press. First a precoat slurry is circulated thru the filter
press to coat the cloths with DE to prevent blinding of the cloth
and aid in easy cake removal. The filter press is then pumped with
sludge until it is full. The press is emptied of the “cake” which
is a semi solid of approximately 20-35 % solids. Sludge cake is
high in fats and greases and solids and should be disposed of
according to environmental regulations.
APPLICATIONS:
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