Using Yeast To Deal With High Concentrations Of Msg Wastewater

With the development of industry and agriculture, our environment deteriorates gradually, especially water area pollution. The treatment of high concentration organic wastewater is always a hotspot and a difficulty in wastewater treatment.Monosodium glutamate wastewater contain much contamination, such as thalli albumen, remnant sugar, amino acid, ammonium salt, organic acid, SO42". The COD of the water is 20000~70000mg/L, pH3.2, belonging to the high concentration organic wastewater to solve urgently.Yeast is a kind of fungi. Distributing of yeasts indicates that after the natural selection for a long time, yeasts fit on the surroundings of containing high concentration sugar, high concentration carbon, or high infiltration pressure, which makes it possible to apply to the treatment of the high concentration organic wastewater. The carbon fountain categories of yeasts using are very wide, which makes it possible to apply to the treatment of the different organic waste. The manifest of the treatment of the organic wastewater using yeast is not only reducing the pollution degree of the organic waste, but also gaining the SCP as well by using the waste as a resource.The laboratory-scale continuous treatment of monosodium Glutamate manufacturing wastewater used yeast in the study. DHA (dehydrogenation activity) test indicated that mixed yeast strains isolated from high strength monosodium glutamate wastewater could endure the high concentrations of COD, S042", and NH}"1" containing in glutamate wastewater. The mixed yeast strains were inoculated to a biological contact oxidation reactor, and the reactor was used to treat the glutamate wastewater. Under a COD load ranging from 2.0 to 14.3kg/(m3 ?d), the COD removal rate was over 80%. On the other hand, supplementation of phosphorus was necessary to maintain a stable COD removal performance. Variation of effluent pH seemed to have no apparent influence on COD removal rate. The optimum pH for the growth of yeast, however, was found to be in the range of 3.5~5.0. The effluent wastewater contained high concentration of yeast bodies, which could be utilized as a forage additive because of its high protein content (57.9%) and well-balanced amino acid distribution. The effluent wastewater using yeast was treated by activated sludge, and the COD removal rate was 93% finally.Moreover, a series of exploring experiments of the NH4+-N removal, hydrolyzation of wastewater, coagulation purify study showed that the effect of the acidification is small, and the COD was about 360mg/L by polymerizing FeCla.