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Biosolids management
The Princeton facility originally
considered conventional aerobic digestion that would have involved
significant capitol cost while the process would incur high operating cost
associated with aeration. In light of these concerns, Commonwealth Engineers
assessed the feasibility of ATAD. AutoThermal Thermophilic Aerobic Digestion
System reduces the volatile solids concentration and destroys pathogens in
the sludge. The natural heat generated by the organisms is used to increase
the temperature in the ATAD system; ATAD reduces a facilities size and
improves sludge quality.
The ATAD System disinfects
the bio solids.
However ATAD has been a challenge to
operators to control the odor produced from this treatment. The WWTP has
installed a bio-filter to help reduce odors from this process.
The air that is being drawn off the ATAD system, first flows through a
mister where water and compressed air sprays a mist and removes ammonia form
the air.
The bio-filter then removes remaining odors.
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ATAD Mister |
ATAD Bio-Filter |
A Gravity belt thickener dewaters the
sludge prior to ATAD treatment in order to reduce the facilities sizing and
improve solids processing.
A
Belt filter press dewaters the digested biosolids from ATAD system prior to
land filling or land application.
Currently the City of Princeton is recycling is biosolids. Our biosolids are
being land applied.
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