کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4484314 | 1316916 | 2011 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Bioaugmented membrane bioreactor (MBR) with a GAC-packed zone for high rate textile wastewater treatment Bioaugmented membrane bioreactor (MBR) with a GAC-packed zone for high rate textile wastewater treatment](/preview/png/4484314.png)
The long-term performance of a bioaugmented membrane bioreactor (MBR) containing a GAC-packed anaerobic zone for treatment of textile wastewater containing structurally different azo dyes was observed. A unique feeding strategy, consistent with the mode of evolution of separate waste streams in textile plants, was adopted to make the best use of the GAC-zone for dye removal. Dye was introduced through the GAC-zone while the rest of the colorless media was simultaneously fed through the aerobic zone. Preliminary experiments confirmed the importance of coupling the GAC-amended anaerobic zone to the aerobic MBR and also evidenced the efficacy of the adopted feeding strategy. Following this, the robustness of the process under gradually increasing dye-loading was tested. The respective average dye concentrations (mg/L) in the sample from GAC-zone and the membrane-permeate under dye-loadings of 0.1 and 1 g/L.d were as follows: GAC-zone (3, 105), permeate (0, 5). TOC concentration in membrane-permeate for the aforementioned loadings were 3 and 54 mg/L, respectively. Stable decoloration along with significant TOC removal during a period of over 7 months under extremely high dye-loadings demonstrated the superiority of the proposed hybrid process.
Research highlights
► A bioaugmented MBR with an anaerobic GAC bed was developed for textile wastewater.
► Long-term significant colour and TOC removal under high dye-loadings was observed.
► Anaerobic and aerobic degradation was the key in colour and TOC removal, respectively.
► Bioaugmented aerobic stage significantly aided decoloration under higher dye-loadings.
► A unique wastewater feeding strategy was proposed.
Journal: Water Research - Volume 45, Issue 6, March 2011, Pages 2199–2206