Claims
- 1. A system for removing silicone oils from waste water generated by a silicone manufacturing plant, said waste water containing water, silicone oils, and silicone oil contaminated solids, said system comprising:a centrifuge having a feed inlet containing waste water generated by said silicone manufacturing plant, a sludge cake discharge containing silicone oil contaminated solids, and a liquid discharge containing said silicone oils, wherein the concentration of said solids in said sludge cake discharge is higher than the concentration of said solids in said liquid discharge; and a dryer operated at a temperature within the range of 80° C. to 100° C., said dryer having a dryer inlet containing silicone oil contaminated solids discharged from said centrifuge sludge cake discharge, and a dryer outlet containing a sludge product that comprises at least 10% water.
- 2. The system according to claim 1, further comprising a gravity oil separator that separates free silicone oils from the waste water prior to the waste water being centrifuged.
- 3. The system according to claim 2, further comprising a clarifier wherein waster water separated in the gravity oil separator passes through the clarifier to concentrate finer solids.
- 4. The system according to claim 3, wherein the gravity oil separator and the clarifier each produce silicone oil contaminated solids from bottom flows thereof.
- 5. The system according to claim 4, further comprising a thickener upstream of the centrifuge which receives and thickens the bottom flows of the gravity oil separator and the clarifier.
- 6. The system according to claim 1, wherein the dryer comprises a continuously mixed sludge dryer.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a divisional of application Ser. No. 09/457,218, filed Dec. 8, 1999, now U.S. Pat. No. 6,319,406.
US Referenced Citations (21)