Integrated biological (anaerobic-aerobic) and physico-chemical treatment of baker's yeast wastewater.
The UASB reactor (35 degrees 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 16 g COD/l/d). The aerobic-anoxic biofilter (19-23 degrees 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 (approximately 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.
Kalyuzhnyi
S
S
Department of Chemical Enzymology, Chemistry Faculty, Moscow State University, 119992 Moscow, Russia. svk@enz.chem.msu.ru
Gladchenko
M
M
Starostina
E
E
Shcherbakov
S
S
Versprille
B
B
D000332:Aerobiosis; D000535:Aluminum / Q000737:chemistry; D000641:Ammonia / Q000378:metabolism; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D002118:Calcium / Q000737:chemistry; D002244:Carbon / Q000378:metabolism; D004573:Electrolytes / Q000737:chemistry; D005374:Filtration; D005525:Food-Processing Industry; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry; D009573:Nitrites / Q000737:chemistry / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*
D004573:Electrolytes; D007220:Industrial Waste; D009573:Nitrites; D002244:Carbon; D000641:Ammonia; D000535:Aluminum; D007501:Iron; D009584:Nitrogen; D010100:Oxygen; D002118:Calcium