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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
>>I have a client that called for help with installation of a
>>separate oil and grease from their wastewater. They are a
>>facility, with a daily flow of about 130,000gal/day. I have
>>questions: Would a DAF be the most appropriate type system for
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
The most common methods are plate-and-frame or belt type filter
presses. They are quite effective.
>>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.
Dan Kraybill, P.E.
Illinois Waste Management and Research Center
Any input would be
>>Sherry J. Davis, CHMM
>>Industrial P2 Specialist
>>133 Ward Hall,KSU
>>Manhattan, KS 66506-2508
- From: List Manager <email@example.com>