纳米铁强化生物技术处理染料废水的效能

Research on dyeing wastewater treatment with an integrated nanoscale zero-valent iron and biology technology

构建纳米铁(nZVI)-生物耦合系统,探讨连续流反应器中耦合系统处理刚果红废水的可行性和可控性.研究发现nZVI将刚果红大分子降解为小分子后,提高了废水的可生化性(由0.04提高至0.69)并降低了毒性(由90.25%降至30.57%),为生物单元提供良好的环境条件.反应器连续运行期间,耦合系统对初始浓度为500mg/L的刚果红废水脱色率达99%,COD从167mg/L降低到约50mg/L.而单一生物系统的脱色率仅为30%~70%,COD降至116mg/L,且波动较大.研究结果表明,nZVI-生物耦合系统是一种能够深度处理难降解有机染料废水的技术手段.

A coupling system consisting of nano zero valent iron and membrane bioreactor(nZVI-bio system)was constructed to explore the feasibility and controllability of a continuous flow reactor for the treatment of Congo red(CR)wastewater.Since nZVI pretreatment converts CR macromolecules into small molecules,the biodegradability index denoted by BOD5/COD increased from 0.04 to 0.69 and toxicity reduced from 90.25%to 30.57%compared to the initial CR wastewater,which provides good environmental conditions for biological units.During the continuous operation of the coupling system,CR removal efficiency reached 99%and COD was reduced from 167mg/L to 50mg/L(nZVI pretreatment process at an initial concentration of 500mg/L).However,the color removal efficiency was just 30%~70%and COD was reduced to 116mg/L for a conventional biotreatment system,and the fluctuation is large.The results demonstrated that the nZVI-bio system provides new technical support for deep treatment of refractory organic dyes.