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- W2375358305 abstract "This paper intends to report our investigation results on the effect of 5 types of transitional metal ions,that is,the ions of Fe3+,Zn2+,Ni2+,Cr(Ⅵ),Cu2+ and salinity on the aerobic biodegradation of aniline in shaking flasks.In our investigation,we have gained the aniline degradation bacteria from an air-lifted inner-loop reactor under the proper working conditions for aniline wastewater over one year.To get the above results,it was necessary to make the concentration of the ions in the flasks up to 0-50 mg/L and salinity between 04% in them by using NaCl.Then,the biomass had to be regulated so as for it to keep its concentration of 5 000 mg/L in each of the flasks.The result of our investigation shows that proper concentrations of Fe3+,Ni2+,Zn2+,Cr(Ⅵ) and Cu2+ help to speed up the aniline degradation.For example,when the concentration of Fe3+ is 25 mg/L,the aniline degradation rate can rise by 26.6%.Similarly,the aniline degradation rate tends to rise by about 10% if the concentrations of Ni2+ and Zn2+ reach 2.5 mg/L and 1 mg/L respectively.A slight increase of the concentration of Cr(Ⅵ) and Cu2+,such as to 1 mg/L and 0.5 mg/L respectively,is expected to speed up the degradation rate by about 6%.However,the aniline degradation bacteria would be inhibited when their concentration were beyond 50 mg/L,5 mg/L,2.5 mg/L,2.5 mg/L and 1 mg/L respectively.For example,when the concentrations of Fe3+,Ni2+,Zn2+ and Cr(Ⅵ) were at about 50 mg/L,the degradation rate would decrease by 2.8%,24.1%,27.2% and 35.4%,respectively.Another example is with Cu2+.When the concentration of Cu2+ was over 10 mg/L,the aniline degradation bacteria would entirely cease to grow,which shows that the toxicity order in the biomass is likely to be Cu2+Cr(Ⅵ)Zn2+Ni2+Fe3+.And,therefore,the salinity variance proves to have effect on the nutrition absorption of the aniline degradation bacteria.And,consequently,the aniline degradation velocity would decrease sharply with the continuous increment of salinity.That is to say,when the salinity is 4%,the aniline degradation rate is 11.03 mg/(L·h),i.e.only 26.3% of that 41.9 mg/(L·h) in comparison with the salinity of 0.5%.Thus,it can be concluded that the optimal salinity for the growth of aniline degradation bacteria should be between 0.5% and 1%.Therefore,in order to promote the degradation of the aniline,both the metal ions' concentration and the salinity should be controlled at the optimal range in wastewater treating." @default.
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- W2375358305 date "2008-01-01" @default.
- W2375358305 modified "2023-09-22" @default.
- W2375358305 title "Effects of metal ions and salinity on aerobic biodegradation of aniline" @default.
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