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| | | Supreme Being
Group: Forum Members
Last Login: 6/18/2008 10:17:32 AM
Posts: 98, Visits: 161 |
| | What will be the negative effects of waste high in oil and grease being dumped into aerobic digesters. The digester capacity is .297 MG with an average detention time of one to two weeks before being dewatered via belt filter press. The waste is from a meat processor and contains about 1100 mg/L Oil and Grease. Volume dumped is a approx. 1000 to 3000 gal/week. |
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| | | Supreme Being
Group: Forum Members
Last Login: 8/21/2008 12:58:10 PM
Posts: 101, Visits: 1,083 |
| | Dont take it................Along with the extreme BOD/COD loading in your Digesters.......you will have problems with foaming, coating of diffusers , down stream processes from decants and alot of problems with blinding of your belt filter press. |
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| | | Supreme Being
Group: Forum Members
Last Login: 8/25/2008 11:36:22 AM
Posts: 372, Visits: 728 |
| I think a meat processor would be classified as an "industrial" user and, if you have a pretreatment program, the processor should have a permit to discharge to your system. I would require the meat processor to pretreat the waste (remove the fat, oil and grease). I think such materials could be disposed in the landfill. Even though it is a small amount, I wouldn't want to put too much in the aerobic digester. If there is another plant nearby with an anaerobic digester, it might be handled better there.
David |
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| | | Supreme Being
Group: Forum Members
Last Login: Yesterday @ 2:37:11 PM
Posts: 537, Visits: 1,493 |
| | First I would look for a fat rendering plant. Second, put it on the ground and till it in. (Makes a good soil stabilizer, is biogradable, and has fertilizing properties). Third, take it to an incinerator. Alternatives: If it is not combined with sewage, then sand drying beds(slow draining) and to the land fill. If it is combined with sewage then you will have odors so drying beds may be questionable depending on the location of the populus. A seperate aerobic digestion tank is possible when mixed with activated sludge to speed up the biodegrading process. However as stated above grease can be problematic. |
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| | | Forum Member
Group: Forum Members
Last Login: 8/19/2008 5:17:10 PM
Posts: 46, Visits: 49 |
| | There is much talk as of lately regarding plants accepting grease from pumpers/grease traps etc and injecting it into the digester in metered and regulated amounts. Several written reports on the benefits have been done and well as facilities in place to accept the grease. The benefits are said to be increased VS reduction and increased gas production which will benefit our cogen facility. I believe Simi Valley or another facility in So Cal has this in place with stellar results. |
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| | | Junior Member
Group: Forum Members
Last Login: 7/3/2008 9:52:08 AM
Posts: 22, Visits: 104 |
| | East Bay MUD in Oakland also has a grease system that I think they bleed back to the digesters. If it's done right, it can significantly help your gas production. If it's done wrong, there's the foaming, instability, etc. mentioned above. |
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