Details

Autor(en) / Beteiligte

• Hai, Faisal Ibney
• Yamamoto, Kazuo
• Nakajima, Fumiyuki
• Fukushi, Kensuke

Titel

Bioaugmented membrane bioreactor (MBR) with a GAC-packed zone for high rate textile wastewater treatment

Ist Teil von

• Water research (Oxford), 2011-03, Vol.45 (6), p.2199-2206

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2011

Quelle

MEDLINE

Beschreibungen/Notizen

• 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. ► 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.