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Case Study

Chicken Processing Plant Grease Trap and Aeration Ponds

Total Suspended Solids, Biological Oxygen Demand, Ammonia, Hydrogen Sulfide, and Sludge Reduction


A large chicken processing and rendering plant in Southeast Georgia faced numerous problems associated with the treatment of wastewater on site for a daily flow of 1.8 million gallons. The 1st problem was a heavy fat, grease and oil build up on the surface of a 10 thousand gallons grease trap located down-line from the rendering building. The solids build up on the surface of the grease pit exceeded 2.5 ft. and forced the plant to remove the cap with a backhoe once the thickness reached the pit’s overflow level. A 2nd problem was high TSS (750-1,100 ppm), COD/BOD (1,400-1,800 ppm), and ammonia nitrogen (50-70 ppm) in the plant’s two aeration ponds. The ponds are in sequence with the first pond’s capacity at 4.5 and the second at 14 million gallons. The plant has a land application permit allowing for irrigation of hay fields with treated wastewater. The 3rd problem was high H2S levels from the aeration ponds.


To address the sludge cap problem on the grease pit, an Organic Product was applied through a pressure sprayer at a rate of 6-8-oz./gal. directly onto the surface of the cap. One quart of concentrated product was applied per treatment. The cap was treated twice each day. Within 7 days the cap was reduced to ~5 in. of tan foam. Treatment continued at same rate twice daily.

To address TSS, COD/BOD, ammonia nitrogen, and hydrogen sulfide problems in the aerated ponds, the Organic Product was applied. Pond #1 (4.5 million gallons) was shocked with 75 gal. and Pond #2 (14 million gallons) was shocked with 175 gal. This 10-20 ppm shock treatment was applied with a high-pressure hose to provide uniform coverage of the pond surface area and allow for better blending of the product into the wastewater. A daily maintenance program of 5-gal. (3-5 ppm of daily flow rate) of product would be metered into Pond #1 at the influent point. There was significant reduction in hydrogen sulfide odors with 48 hours of treatment. After 30 days of treatment the TSS and COD/BOD levels were reduced by 60-65%. The ammonia nitrogen levels were reduced by ~ 85%. The maintenance application rate of 5 gal./day continued.


The Organic Product used in this application performed exceeding original expectations.

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