초록 ▼

A process and system for removing animal processing contaminants and fats, oils, and greases from large volume quantities of waste water. In the process, a waste water stream containing the contaminants is treated with a chemical oxidant, polymer compound and coagulant to create a particle having a

A process and system for removing animal processing contaminants and fats, oils, and greases from large volume quantities of waste water. In the process, a waste water stream containing the contaminants is treated with a chemical oxidant, polymer compound and coagulant to create a particle having a diameter greater than 50 microns. Treated waste water is passed through a microfiltration membrane which physically separates the contaminant particle from the waste water. Commercially available microfiltration membranes having a pore size in the range of 0.5 micron to 10 microns may be used. The treated waste water flow rate through the microfiltration membranes can range from at least 200 gallons per square foot of membrane per day (“GFD”) to in excess of 750 GFD. Solids are removed from the membrane surface by periodically backflushing the microfiltration membranes and draining the filtration vessel within which the membranes are located. The dislodged solid material within the filtration vessel is flushed into a holding tank for further processing of the solids. The solid waste product may be incorporated into products for consumption by a different species.

대표청구항 ▼

1. A process for removing animal processing contaminants and fats, oils and greases (“FOG”) from large volumes of wastewater comprising the steps of:(a) treating a wastewater stream containing animal processing contaminants and FOG with an oxidant, wherein the oxidant reacts with the c

1. A process for removing animal processing contaminants and fats, oils and greases (“FOG”) from large volumes of wastewater comprising the steps of:(a) treating a wastewater stream containing animal processing contaminants and FOG with an oxidant, wherein the oxidant reacts with the contaminants and FOG to break down proteins;(b) treating the treated wastewater stream with an inorganic polymeric compound, wherein the inorganic polymeric compound dissociates and binds to suspended contaminant and FOG solids to form a first particulate having a size approximately in the range of 15-50 microns;(c) treating the treated wastewater stream with a coagulant, wherein the coagulant reacts with the first particulate to form a second particulate having a size greater than 50 microns;(d) passing the treated wastewater stream through an inclined plate separator such that the second particulate are removed from the treated wastewater stream passing through the inclined plate separator,(e) passing the treated wastewater stream through a sand filter at a pressure approximately no more than 80 psi such that the second particulate are removed from the treated wastewater stream passing through the sand filter;(f) passing the treated wastewater stream through a carbon column at a pressure approximately in the range of 25-75 psi such that the second particulate is remove from the treated wastewater stream passing through the carbon column;(g) passing the treated wastewater through a micro filtration membrane having a pore size approximately in the range from 0.5 micron to 10 microns, wherein the treated wastewater flow rate is at least 200 gallons per square foot of membrane per day (“GFD”), such that the animal processing contaminants and FOG are removed from the treated wastewater stream passing through the micro filtration membrane; and(h) periodically backflushing the micro filtration membrane to remove the second particulate from the membrane surface. 2. The process as recited in claim 1, wherein the oxidant is in the range from 5 parts per million (“PPM”) to 100 PPM. 3. The process as recited in claim 1, wherein the oxidant is sodium hypochlorite, ozone, peroxides, potassium hypochlorite or chlorine dioxide. 4. The process as recited in claim 1, wherein the inorganic polymeric compound is an aluminum chlorohydrate, polyaluminum chloride, aluminum sulfate, ferric sulfate, calcium aluminate or sodium aluminate. 5. The process as recited in claim 1, wherein the coagulant is an anionic polyacrylamide. 6. The process as recited in claim 1, wherein the coagulant is a cationic polyamine. 7. The process as recited in claim 5, wherein the anionic polyacrylamide is at a dose of approximately at least 3 PPM. 8. The process as recited in claim 7, wherein the anionic polyacrylamide is at 40 to 50 mole percent and 80 to 100 percent anionic charge. 9. The process as recited in claim 1, wherein the microfiltration membrane comprises polypropylene felt with a coating of polytetrafluoroethylene (PTFE). 10. The process as recited in claim 1, wherein the microfiltration membrane comprises polypropylene or polyethylene membrane bonded to a polypropylene or polyethylene felt backing. 11. The process as recited in claim 1, wherein the treated wastewater is passed through the microfiltration membrane at a pressure approximately no more than 24 psi. 12. The process as recited in claim 1, further comprising the steps of removing the second particulate from the inclined plate separator, and dewatering the second particulate to recapture the wastewater so that the wastewater may be returned to the waste-water stream for treatment and the second particulate may be incorporated as a solid waste product into a composition for consumption by a different species. 13. The process as recited in claim 1, further comprising the step of periodically backflushing the sand filter to recapture the second particulate for incorporation as a solid waste product into a composition for consumption by a different species. 14. The process as recited in claim 1, further comprising the step of periodically backflushing the carbon column to recapture the second particulate for incorporation as a solid waste product into a composition for consumption by a different species. 15. The process as recited in claim 1, wherein the treated wastewater discharged from the microfiltration membrane has a biological oxygen demand (“BOD”) less than 25 PPM. 16. The process as recited in claim 1, wherein the treated wastewater discharged from the microfiltration membrane has a chemical oxygen demand (“COD”) less than 25 PPM. 17. The process as recited in claim 1, wherein the treated wastewater discharged from the microfiltration membrane has total suspended solids (“TSS”) less than 1 PPM. 18. The process as recited in claim 1, wherein a potential of hydrogen (“pH”) is in the range of approximately 4-11.