Screening Of Dye-Decolorizing Fungus And The Conditions Of Dye Decolorization

In recent years, a number of studies have been done on some microorganisms which are able to biodegrade and biosorb dyes in wastewater. There are many reports about a wide variety of microorganisms which can decolorize dyes. Seven decolorizing strains are screened from the wastewater of the 3rd chemical factory in Baoding. By classic methods of fungus identification, their taxonomic station had been identified. According to their morphologica characteristics and colony features, two strains of them belong to Apergillus ,the others belong to Penicillium , Phacodium, Magnusia, Sartorya, Talaromyces. The seven fungus could mainly biosorb dyes but not biodegradate.The paper studied carbon resource, nitrogen resource, temperature, pH, volume of culture, and concentration of dyes on decolorization rate. At the same time, the test of reusing fungus pellet and the effect of environment condition on endomycopsi.sp. were studied too. The results showed:l.The strain of KL-l,10N-l,NG-2 could utilize cellulose as carbon source and the decolorization rates were above 90%.Dextrin was used as the carbon source by 10B-2 and decolorization rate was 96.3%.The other strains' carbon source is com steep liquor. The effect of NHUCl and corn steep liquor were better than others as nitrogen resources, but corn steep liquor was cheaper. Then the following test, com steep liquor was used as nitrogen resources.2.When the temperature was between 25?-28?, most strains showed the best decolorizing result. Different strains had different optimum pH. The optimum pH of KL-1,HL,NG-3,MG-1,10B-1 was 5;NG-1 and 10B-1 was 4. With the volume of culture increased, the decolorization rate of NG-1 was decreased. When the volume of KL-l,NG-2,NG-3 was 50ml, the decolorization rate was the highest. The___________________________________________Abstract____________________________________________decolorization rate was decreased mostly when the volume of culture was90ml.KL-l,HL,NG-2,10B-2 and NG-3 could endure higher dyes' concentration. Thebest result of biodegrade rate was only 20.6%,which showed the effect was mainlycaused by biosorb, not by biodegrade.3.The endurance ability of Mixed strains was better than single strains. The max biodegrade rateto aromatic amine compound was 96.39%, and 100% to dyes. The decolorization rate ofreusing fungus pellet was still higher after being used 8 times.4.The decolorization rate of endomycopsi.sp. to acid black NG, acid black 10B andactive red was best at pHS.O.The strain could endure higher concentration of dyes andHg2+. Ag+. Cu2+. heavy metal ions.