长期运行的不同序批式活性污泥工艺去除Cr(Ⅵ)的比较研究
Comparison of Cr(Ⅵ) removal among different long-term cultured sequencing batch reactors
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摘要: 对不同序批式(SBR)活性污泥工艺，即厌氧SBR、好氧SBR及厌氧好氧SBR去除废水中的Cr(Ⅵ) 进行了研究。结果表明，在反应器起始Cr(Ⅵ)浓度为0.5～2 mg/L时，好氧SBR的Cr(Ⅵ) 去除率低于20％，微生物量不断降低；厌氧和厌氧好氧SBR的Cr(Ⅵ)去除率都达到94％以上，但前者的微生物量持续减少、出水浊度高，而后者的微生物量稳定增加、出水浊度低。因此，厌氧好氧SBR更适合于去除废水中的Cr(Ⅵ)。对厌氧好氧SBR系统的进一步研究表明，该系统在厌氧阶段有明显的磷释放、聚羟基烷酸(PHA)合成和糖原降解，好氧阶段有明显的磷吸收、PHA降解和糖原合成。还对厌氧好氧SBR中Cr(Ⅵ) 的去除机理进行了讨论。Abstract: The aim of this research was to remove Cr(Ⅵ) in wastewater by activated sludge in different sequencing batch reactors (SBR), i.e., anaerobic SBR, aerobic SBR, and anaerobicaerobic SBR. The results revealed that at Cr(Ⅵ) initial concentrations of 0.5～2 mg/L, the removal efficiency was less than 20% with decreasing biomass in the aerobic SBR system, and both the anaerobic and anaerobic-aerobic SBRs had high chromium removal efficiency, but the former showed decreasing biomass density and high effluent turbidity and the latter exhibited increasing biomass concentration and low effluent turbidity. It seems that the anaerobicaerobic SBR can be used to remove Cr(Ⅵ) in wastewater. Further investigation showed that in the anaerobicaerobic SBR, during the anaerobic stage there were notable phosphate release, polyhydroxyalkanoates (PHA) synthesis and glycogen degradation, and in the aerobic time there were obvious phosphate uptake, PHA degradation and glycogen synthesis. The possible mechanisms for Cr(Ⅵ) removal in the anaerobicaerobic SBR were discussed.
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Key words:
- activated sludge /
- Cr(Ⅵ) removal /
- anaerobic SBR /
- aerobic SBR /
- anaerobic-aerobic SBR
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