Patent ID: 11858840
Assignee: JP STILTSKIN, LLC
Field: Environmental technology (Chemistry)
Classification: CPC C | IPC C

Claim 10:
11. A method of treating an animal processing wastewater stream including lipids and protein solids, the method comprising:
a) acidifying the wastewater stream, wherein the wastewater stream pH is adjusted to a value of in the range of 4.8-5.2;
b) adding a first density modifier to the wastewater stream, said density modifier including one or more of lanthanum, cerium, or praseodymium salts;
c) adding a cationic polymer to the wastewater stream;
d) adding an anionic polymer to the wastewater stream;
e) after “d” separating density modified floating material that includes protein solids from the wastewater stream with a dissolved air flotation unit;
f) holding a volume of the wastewater stream in a holding tank for a time period of between 1 and 12 hours;
g) discharging the volume of “f” from the holding tank;
h) treating the volume discharged in g) with a second density modifier; and
i) using a second dissolved air floatation unit to remove material that includes protein solids from the wastewater stream after “h”.