The UASB reactor (35°C) was quite efficient for removal of bulk COD (52–74%) from simulated (on the basis of cultivation medium from the first separation process) general effluent of baker's yeast production (the average organic loading rates varied from 8.1 to 16g COD/l/d). The aerobic-anoxic biofilter (19–23°C) can be used for removal of remaining BOD and ammonia from anaerobic effluents; however, it suffered from COD-deficiency to fulfil denitrification requirements. To balance COD/N ratio, some bypass (∼10%) of anaerobically untreated general effluent should be added to the biofilter feed. The application of iron (III)-, aluminium- or calcium-induced coagulation for post-treatment of aerobic-anoxic effluents can fulfil the limits for discharge to sewerage (even for colour mainly exerted by hardly biodegradable melanoidins), however, the required amounts of coagulants were relatively high.
Integrated biological (anaerobic–aerobic) and physico-chemical treatment of baker's yeast wastewater
S. Kalyuzhnyi, M. Gladchenko, E. Starostina, S. Shcherbakov, B. Versprille; Integrated biological (anaerobic–aerobic) and physico-chemical treatment of baker's yeast wastewater. Water Sci Technol 1 November 2005; 52 (10-11): 273–280. doi: https://doi.org/10.2166/wst.2005.0703
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