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Re: DAF



I have actually quite a bit of experience with DAFs. It is not strictly P2, but I will give it a try. My comments are in bold to distinguish them. I am not shouting.


At 10:27 AM 2/7/01 -0600, List Manager wrote:
>
>>Forwarded on behalf of Sherry Davis
>>
>>Dear P2techers:
>>I have a client that called for help with installation of a system to
>>separate oil and grease from their wastewater.  They are a pet food
>>facility, with a daily flow of about 130,000gal/day.  I have three
>>questions: Would a DAF be the most appropriate type system for him to
>>use?
DAF is appropriate, but they may also want to look at membrane filtration. DAF has an advantage as the daily flows become larger. At 130,000 gal/day they really need to run some economics numbers to see which would be more cost effective.

>>What would be the best method to dry this sludge as much as possible?
The most common methods are plate-and-frame or belt type filter presses. They are quite effective.
>>Is
>>there a re-use for the recovered solids?
Most commonly the solids, which will be predominantly animal and vegatable fat, will be sent to a rendering plant to be made into non-edible fat based by-products. One common final use for these is as a raw material in cosmetics.

In this area membrane filtration has an advantage in that DAF usually needs to use coagulant aides such as alum or polymers to aid in the separation while mebranes do not. The additives may reduce the value of the fats to the rendering plant.

In the absense of more detailed information, that is about as precise as I can get. Let me know if you have further questions.

Best Regards,

Dan Kraybill, P.E.
Illinois Waste Management and Research Center
217/333-8947
Any input would be
>>appreciated.
>>
>>Sherry J. Davis, CHMM
>>Industrial P2 Specialist
>>133 Ward Hall,KSU
>>Manhattan, KS  66506-2508
>>Fax: 785-532-6952
>>Phone: 1-800-578-8898
>>sbd@ksu.edu
>
>------------------------------
>Jini Cook
>List Manager
>listman@wmrc.uiuc.edu
>217.244-6553     jcook@wmrc.uiuc.edu
>
>