Effect of intermittent aeration on textile dyeing wastewater treatment in downflow hanging sponge column integrated with hollow fiber submerged anaerobic membrane bioreactor

• Published in: Bioresource technology reports 2024-06, Vol.26, p.101869, Article 101869
• Main Authors: Saquib, Syed, Julian, Helen, Suhardi, Sri Harjati, Watari, Takahiro, Yamaguchi, Takashi, Setiadi, Tjandra
• Format: Article
• Language: English
• Subjects: Anaerobic membrane bioreactors; Anaerobic-aerobic; Downflow hanging sponge; Hollow fiber membrane; Textile dyeing wastewater
• ISSN: 2589-014X; 2589-014X
• DOI: 10.1016/j.biteb.2024.101869

An HF-sAnMBR-DHS system was examined for enhanced RB5 diazo dye synthetic textile wastewater treatment. Natural aeration was provided during Phase-1 (51 days), while intermittent forced aeration (2 L/min for 5 min ON/OFF cycle) was purged into the DHS in Phase-2 (66 days). The mean tCOD and sCOD removal at P-1 were 88.43 ± 1.84 % and 90.82 ± 0.78 %, respectively, whereas in P-2, the removal reached 94.30 ± 2.01 % and 95.79 ± 0.67 %, respectively. Spectrophotometric analysis reveals 81.41 ± 5.02 % color reduction in P-1 whereas and P-2, 83.40 ± 6.93 % decolorization. The mean Pt-Co levels were 366.33 ± 112.91 and 222.13 ± 44.41 in both phases respectively. At the median initial flux (14.79 LMH), no significant fouling occurred in the membrane module. Microbial analysis revealed Clostridium as a major genus in the HF-AnMBR and DHS, attributed to azo dye-degrading bacteria. The abundance of aerobic microbes present in the DHS might help in further degradation of the intermediate aminated compounds. [Display omitted] •Integrated HF-sAnMBR-DHS was established for higher treatment of dye-laden wastewater.•Intermittent aeration enhanced the overall dye treatment and decolorization.•No membrane fouling occurred at median flux of 14.79 LMH.•Clostridium was the major genus in the HF-sAnMBR and DHS.•Breakdown of intermediate aminated compounds can be aided by aerobic microbes in DHS.