g of auxiliary contains 200 mg org c 1 l of wash liquor contains 4500 mg org c from fat 1400 mg of org c from the detergent and 200 mg org c from the auxiliary making a total of 6100 mg org c lt 3 g l fat lt 1 g l detergent ingredients u2266 0 2 g l auxiliary ingredients and various quantities of solids were removed from the wash liquor and rinsing water of rinse 1 they were introduced into the fat separator after demulsification with a demulsifier based on metal salt microfloc efw a product of henkel kgaa after fat separation the wastewater still contained lt 1 mg l fat the other water ingredients were 20 30 removed leaving 800 mg l detergents ingredients 150 mg l auxiliary ingredients and various quantities of solids the following maximum quantities of org c remained in 1 l pretreated wastewater 0 7 mg from fat 500 mg from detergent and 100 mg from auxiliary making a total of 600 mg the pretreated wastewater from the wash cycle and rinse 1 and the wastewater of the other rinses were combined in an equalization tank and then subjected to flotation sedimentation the combination of the two wastewaters changed the contents of the wastewater as follows the wastewater with these ingredients was freed from the solids in the flotation sedimentation stage this wastewater was introduced into an immersion type bacteria bed reactor for biological treatment this reactor consists of a fixed bed reactor wheels with upgrowth and activated sludge given a holding time of about 12 h the biological degradation can assumed to be gt gt 95 after the biological treatment the following c contents were obtained per liter of wastewater 0 3 mg from fat 45 mg.