Combined biological and physico-chemical treatment of baker's yeast wastewater including removal of coloured and recalcitrant to biodegradation pollutants.
The UASB reactor (35 degrees C) 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'syeasts (the average organic loading rates varied from 3.7 to 10.3 g COD/l/d). The aerobic-anoxic biofilter (20 degrees C) can be used for removal of remaining BOD and ammonia from strong nitrogenous anaerobic effluents; however, it suffered from COD-deficiency to fulfil denitrification requirements. To balance the 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 iron concentrations around 200 mg/l.
Gladchenko
M
M
Department of Chemical Enzymology, Chemistry Faculty, Moscow State University, 119992 Moscow, Russia. mag@enzyme.chem.msu.ru
Starostina
E
E
Shcherbakov
S
S
Versprille
B
B
Kalyuzhnyi
S
S
D001420:Bacteria, Aerobic / Q000378:metabolism; D001421:Bacteria, Anaerobic / Q000378:metabolism; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D005374:Filtration; D007220:Industrial Waste / Q000517:prevention & control; D007501:Iron / Q000737:chemistry; D008970:Molecular Weight; D009573:Nitrites / Q000737:chemistry / Q000378:metabolism; D017672:Nitrogen Compounds / Q000378:metabolism; D011108:Polymers / Q000737:chemistry; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
D007220:Industrial Waste; D009573:Nitrites; D017672:Nitrogen Compounds; D011108:Polymers; D014874:Water Pollutants, Chemical; C011908:melanoidin polymers; D007501:Iron