ИСТИНА

The UASB reactor (35 oC) was quite efficient for removal of bulk COD (62-67%) even for such high strength and recalcitrant wastewater as the cultivation medium from the first separation process of baker’s yeasts (the average organic loading rates varied from 3.7 till 10.3 g COD/l/d). The aerobic-anoxic biofilter (20 oC) can be used for removal of remaining BOD and ammonia from strong nitrogeneous anaerobic effluents; however, it suffered from COD-deficiency to fulfil denitrification requirements. To balance COD/N ratio, some bypass of raw wastewater should be added to the biofilter feed. The application of iron chloride coagulation for post-treatment of aerobic effluents may fulfil the discharge limits (even for colour mainly exerted by hardly biodegradable melanoidins) under iro concentrations around 200 mg/l.