金属离子及盐度对硝基苯厌氧生物降解过程的影响

The Effect of Metal Ions and Salinity on Anaerobic Biodegradation of Nitrobenzene

    摘要
  • 摘要: 以硝基苯废水处理反应器内的污泥为菌源，采用间歇反应的方法分别考察Fe3+，Ni2+，Zn2+，Al3+，Cr(Ⅵ)和Cu2+ 6种金属离子及盐度对硝基苯厌氧生物降解过程的影响.结果表明，适宜质量浓度的Fe3+，Ni2+，Zn2+，Al3+和Cr(Ⅵ)可促进硝基苯的降解. 当ρ(Fe3+)为5 mg/L，ρ(Ni2+)，ρ(Zn2+)和ρ(Al3+)为1.0 mg/L及ρ〔Cr(Ⅵ)〕为0.50 mg/L时，硝基苯的降解速率提高5%～23%. 当ρ(Fe3+)，ρ(Ni2+)，ρ(Zn2+)，ρ(Al3+)，ρ〔Cr(Ⅵ)〕和ρ(Cu2+)分别大于50，10.0，5.0，5.0，5.0和0.25 mg/L时，金属离子开始对硝基苯降解菌产生抑制作用，毒性顺序为Cu2+>Cr(Ⅵ)>Al3+>Zn2+>Ni2+>Fe3+. 硝基苯降解菌生长的最佳盐度为0.25%～1.00%.

     

    Abstract: The effects of six metal ions including Fe3+, Ni2+, Zn2+, Al3+, Cr(Ⅵ), Cu2+, and salinity on anaerobic degradation of nitrobenzene were investigated in batch reactors. Nitrobenzene degradation bacteria were obtained from a reactor for nitrobenzene wastewater. The results showed that preferable mass concentrations of Fe3+, Ni2+, Zn2+, Al3+ and Cr(Ⅵ) had accelerated nitrobenzene degradation. When their mass concentrations were 5, 1.0, 1.0, 1.0 and 0.5 mg/L respectively, the nitrobenzene degradation rate increased by 5%-23%. However, nitrobenzene degradation bacteria wereinhibited when their mass concentrations exceeded 50, 10.0, 5.0, 5.0, 5.0 and 0.25 mg/L respectively. Toxicity order in mass was Cu2+>Cr(Ⅵ)>Al3+>Zn2+>Ni2+>Fe3+. Optimal salinity for nitrobenzene degradation bacteria was between 0.25% and 1.00%.

     

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