It is important to ...

It is important to understand what the organic load exactly is. In this industry, you are dealing typically with fats, oil, grease, blood, bone etc. that needs to be separated and decomposed by bacteria.

A screening process will definitely be needed to reduce the bulk of the load.

If the size of the plant is an issue, fats and oils are typically flocculated and separated through dissolved air floatation (DAF). This is skimmed off using a mechanical skimmer. Alternatively, you could use an individual or series of anaerobic and aerobic ponds or tanks with mechanical aeration.

Tertiary treatment is either settling pond, clarifier, media filtration or micro/ultra filtration. 

The footprint (size) of the ponds and tanks will increase with the higher organic load to allow sufficient residence time for the bacteria to convert and digest the organic matter. This is the main factor to consider when choosing a treatment process because it contributes to capital costs.

Mechanical aeration and physical barriers such as membranes can reduce the footprint of the plant considerably but will result in increased operating costs. 

I am experienced in Agriculture and Food production wastewater treatment in Asia and Australia. My company also designs and manufactures a range of innovative technologies for this specific application. If you email me at andrew@waterandoilsolutions.com.au, I'll be happy to discuss possible solutions for your needs.