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Two strains named W7 and W16 were isolated by liquid enrichment culture from the corn field where atrazine has been chronically applied. Observed by gram stain and SEM, W7 belonged to gram-positive bacteria and the single cell was short bacilliform; W16 belonged to gram-negative bacteria and the single cell was spherical. Through physiological and identification and 16SrDNA sequence analysis, two...
Due to the important physiological functions of GABA, various methods used to produce it. Biotransformation by microorganism cells is a more promising method than others. Among the GABA-producing lactic acid bacteria, one strain with high producing capacity was isolated from Chinese naturally pickled vegetable. The strain is identified as Lactobacillus brevis, and named as L.brevis TCCC13007 based...
This paper mainly studies the growth and degradation characteristics of the atrazine degradation strain J2 isolated from the soil collected from the cornfield in northern China with a long history of atrazine application. The growth and the degradation characteristics at different pHs, temperatures and in mediums with different salinity are also studied. The results indicate that: when J2 is inoculated...
This research studied the bioremediation of atrazine polluted soil by atrazine degrading strain J2 which is isolated from the long polluted black glebe in the libratory condition. Inoculated the J2 which OD600 value is 1 into the sterilized soil and non-sterilized soil as 1% ratio (bacterial liquid volume mL /soil weight g) respectively, the atrazine concentration of the soil is 10 mg/Kg. J2 utilized...
Based on the practical monitoring data of Erlongshan Reservoir, the paper estimated the status of the eutrophication by the comprehensive trophic state index method. The results indicated that the Erlongshan Reservoir was between mesotropher and Light eutropher with the index from 46.5903 to 57.3904. The degree of eutrophication was in the order of high flow period>average and low period. According...
Various types of pollution source were evaluated in this paper through investigation and analysis in the watershed of Xiquanyan reservoir in recent years. Provide scientific and effective reference and technical support in preventing eutrophication of Xiquanyan reservoir and implementing protection and management decisions by government. Calculation and analysis showed the conclusions: Farmland non-point...
Magnesium-ammonium-phosphate precipitation method (MAP) is a newly-developed technique to remove ammonia nitrogen from wastewater. In this study, MAP method has been studied by using MgCl2-6H2O and Na2HPO4-12H2O as precipitators for treating highly concentrated ammonia nitrogen wastewater. The effect of pH value, formulas of precipitation and precipitator ratio on MAP precipitation efficiency has...
In accordance with the requirements of the treatment system in municipal sewage plants and of influent and effluent quality, this experiment studies the effect of domestic sewage treatment through the design of a CASS miniature-testing device. In the stable test operation phase, the average removal rate of COD, NH3-N, and TP is respectively 93.16%, 86.95%, and 91.09%. Effluent quality meets the requirements...
Based on the analysis of the water quality monitoring data of Xingkai Lake in 2008, the eutrophic level of the water body was evaluated through a comprehensive trophic state index method. The results showed that the comprehensive trophic state index (CTSI) was 47.7 for Da Xingkai and 50.1 for Xiao Xingkai, which indicated that Da Xingkai is in a mesotrophic state and Xiao Xingkai in a light eutrophic...
Collecting the soil which had applied Atrazine for more then 5 years from The Xiang Fang experimental farm of HarBin and the corn field of WuChang in Heilongjiang Province. We isolated 7 microbes which have the ability of Atrazine degrading by the way of the traditional enrichment and isolation of bacteria in the laboratory, then we filtrated 2 microbes which the ability of atrazine degrading was...
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