摘要
采用海藻酸钠和聚乙烯醇添加沸石包埋固定经富集培养的以反硝化聚磷菌为主的活性污泥,研究了固定化菌体的厌氧/曝气运行时间条件,考察盐度及Cr(Ⅵ)金属离子对生物除磷过程的影响。结果表明,厌氧时间为2.5 h,曝气时间为5.5 h。固定化菌体在盐度低于2%时能保持92%以上的除磷效率,而游离菌体在盐度大于1%时除磷效率开始下降,其除磷效率最高只能维持在85%左右;当废水中Cr(Ⅵ)金属离子浓度低于25 mg/L时,固定化菌体仍能保持90%以上的除磷效率,而游离菌体的除磷效率在Cr(Ⅵ)金属离子浓度高于10 mg/L时便迅速降低。固定化菌体的除磷性能显著优于游离菌体。
Enriched denitrifying polyphosphate accumulating bacteria in activated sludge were immobilized with sodium alginate and polyvinyl alcohol using zeolite-embedded. The influences of anaerobic/aeration run-time condition, salinity and concentration of Cr （ Ⅵ ） on biological phosphorus removal with the immobilized bacteria were studied. The results indicated that the anaerobic time was 2. 5 h, aeration time of 5.5 h. Immobilized bacteria in the salinity of less than 2O/oo maintained more than 92% of the phosphorus re- moval efficiency, while the phosphorus removal efficiency of the suspended biomass in the salinity of more than 1% began to decline, its the most efficient phosphorus removal could only be maintained at 85% about. When Cr （Ⅵ） metal ion concentration in wastewater was less than 25 mg/L, the immobilized bacteria remained more than 90% of the phosphorus removal efficiency. The phosphorus removal efficiency of suspended biomass began to decline rapidly when the concentration of Cr （ Ⅵ） metal ion was higher than 10mg/L in the wastewater. The phosphorus removal performance of immobilized bacteria was significantly better than suspen- ded biomass.
出处
《节水灌溉》
北大核心
2010年第3期42-45,共4页
Water Saving Irrigation
基金
国家自然科学基金项目(50871101)
生命分析化学教育部重点实验室2008年度开放课题(KLACLS08009)
关键词
固定化
反硝化聚磷菌
盐度
Cr(Ⅵ)浓度
immobilization
denitrifying polyphosphate accumulating bacteria
salinity
concentration of Cr （Vl） metal ion
