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Meat Packing/Slaughterhouse P2

I'm wondering if anyone has any case study information on methods to collect
blood and solids from a slaughterhouse. 

The facility I am working with already collects about 95% of all the blood,
fat and materials for rendering. It also has a properly functioning grease
trap prior to the sewer discharge which is serviced on a regular schedule. 

However there is still sufficient blood being discharged in the daily wash
down to cause BOD problems for the local wastewater facility in a town of
about 1,000 people. No other significant discharges in town which could be
causing the BOD problem at the wwtp. 

Any suggestions or ideas are appreciated.

UW-Stevens Point
Solid and Hazardous Waste Education Center
College of Natural Resources
1900 Franklin Street
Stevens Point WI 54481
Email  jannis@uwsp.edu