Trap Grease and Poultry DAF Filtering/Treating

[Iapyx]

Good afternoon. We have a simple waste sludge processing plant where we are taking waste sludges primarily from DAF units at poultry and food processing plants (70-80% water, remaining various solids). We have been testing different means of incorporating trap grease into our repertoire and expect these materials will become our primary concern in the next 120 days. In approaching this we have encountered two issues:

1) Filtering: On the front end we are discussing installing a basin with volume for 2-3 small trucks (~10k gallons); the basin would have a simple grating setup that the trucks would dump the sludge through and a manure pump would transfer the sludge to a storage tank. It seems as though this is fairly common and efficient, but are there any major concerns we would have in "operating" this setup? Are there any suggestions as to better screening methods?

2) WWT (for all materials): Our process thoroughly heats and separates out the initial sludge into different groups with one of those being a waste water that still has roughly 10-15% organic solids and high BOD (~150-200k mg/kg). Currently we simply use a basic polymer to remove the solids and then discharge the water for land application as a disposal method. We are looking to improve our treatment process and are currently considering an ozone system with or without the polymer injection. Is anyone familiar with this type of system and its efficacy? Any other thoughts?

Sorry so long, any and all thoughts are appreciated.

 

[bimr]

Land application will most likely be the only feasible method of diposing of wastewater from the sludge processing operation that you have suggested. This is a difficult to treat wastewater and it will be very expensive to treat.

Use of ozone will most likely be uneconomical as ozone is expensive and a large volume will be required.

Not sure why you would want to add trap grease back into the sludge processing. The oil removed may have some beneficial reuse.

 

[Iapyx]

The problem with land app is that our current source will be gone in the next 90-120 days and other sources are significantly more costly. We have spoken with a supplier who believes that his ozone system could be economical (somewhere in the range of $0.03-.05 per gallon); is this a red herring?

Our process removes the grease/oil from the waste sludges (including TG) for reuse, so the waste water we are treating has less than 1% FOG and mostly light, organic particulates.

 

[bimr]

It would surprise me if the ozone was economical.

Perhaps you can relocate to an area with a sanitary sewer system.