纳米磁粉对处理制浆中段废水驯化微氧活性污泥的影响

Effect of Magnetic Fe3O4Nanoparticles on Micro-aerobic Activated Sludge Domestication with Pulping Middle-stage Effluent

关键词:  纳米磁粉  微氧  活性污泥  制浆中段废水

Key Words:magnetic nanoparticles  micro-aerobic  activated sludge  pulping middle-stage effluent

摘要:本实验采用共沉淀法制备了Fe₃O₄纳米磁粉，研究Fe₃O₄纳米磁粉对处理制浆中段废水驯化微氧活性污泥的影响。结果表明，投加Fe₃O₄纳米磁粉对废水的处理效果及污泥的理化特性均优于未投加纳米磁粉的空白组；当纳米磁粉投加量为1.0 g/L时，经55天的驯化，废水COD_Cr去除率达到80%左右，而未投加纳米磁粉的废水COD_Cr去除率不到70%；驯化后污泥具有良好的理化特性，污泥浓度（MLSS）为3.86 g/L，污泥体积指数（SVI）稳定在70 mL/g左右，PN∶PS值为0.87，明显优于未投加纳米磁粉的空白组。

Abstract:Effect of magnetic Fe₃O₄ nanoparticles on micro-aerobic activated sludge domestication with pulping middle-stage effluent was studied. The magnetic Fe₃O₄ nanoparticles were prepared by co-precipitation method and characterized by SEM. The effect of Fe₃O₄ nanoparticles dosage on activated sludge domestication with pulping middle-stage effluent under micro-aerobic conditions was investigated through static experiments. The results showed that the treatment effect and the physical-chemical characters of the sludge with the addition of Fe₃O₄ nanoparticles were better than that of without adding Fe₃O₄ nanoparticles. CODCr removal efficiency reached about 80% for 55d domestication when Fe₃O₄ nanoparticle dosage was 1.0 g/L， while no higher than 70% achieved in the control sample. MLSS， settling and flocculating performances of the sludge were obviously superior to the control group．