Anaerobic wastewater ...

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Anaerobic wastewater treatment is usually very suitable for wastewater from the food and beverages industry. Two examples of techniques are Biopaq ICX and Biopaq AFR. The last technique is also used in wastewater treatment from the poultry industry. 

http://en.paques.nl/products/featured/biopaq/biopaqicx
http://en.paques.nl/products/featured/biopaq/biopaqafr

After the anaerobic treatment it is very common to use a aerobic treatment basin to remove the last part of COD and N.