好氧MBBR处理含吲哚废水的工艺优化试验研究

为了处理制药企业废水中吲哚类有机污染物,采用好氧MBBR(移动床生物膜反应器)工艺对含吲哚废水进行了试验研究,通过考察HRT、曝气量、吲哚冲击负荷等工艺条件对吲哚、COD和NH_4~+-N等去除效果的影响,确定了好氧MBBR反应器的最佳工艺条件。实验结果表明,在HRT在6~18 h变化时,MBBR工艺对吲哚去除率在8 h以上时达到100%,COD去除率在8 h达到89.65%,而NH_4~+-N去除率在12 h达到最高。在曝气量为0.1~0.12 m L/min时,MBBR工艺对COD和NH_4~+-N去除率分别为88.88%~92.95%和65%~66.83%。进水吲哚浓度25~65 mg/L变化时,好氧MBBR对吲哚去除率保持在100%,而对COD和NH_4~+-N去除率也保持在80%和40%以上,表明好氧MBBR工艺在处理难降解有机污染物方面具有显著优势。

Experimental Study of the Process Optimization of Indole-contained Wastewater Treatment by Aerobic MBBR

In this paper, aerobic MBBR(Moving Bed Biofilm Reactor) process was used for the experimental study of indole-contained wastewater treatment, aiming at treatment of indole organic pollutants in pharmaceutical wastewater. On the basis of investigation of the effects of such process conditions as HRT, aeration rate and indole shock load on the removal efficiency of indole, COD and NH4+-N, the optimum process conditions of aerobic MBBR were identified. The results showed that when HRT varied between 6h and 18h, the removal rate of indole reached to 100% after 8h and that of COD reached to 89.65% at 8h, but that of NH4+-N reached to the highest at 12h. When the aeration rate was 0.1~0.12 mL/min, the removal rate of COD and NH4+-N was 88.88~92.95% and 65~66.83% respectively. When the indole concentration of the influent varied from 25 to 65 mg/L, the removalrate of indole kept 100% and that of COD and NH4+-N also kept above 80% and 40%, indicating that the aerobic MBBR process had significant advantages for treatment of organic pollutants hard to be degraded.