Anaerobic-aerobic processes for the treatment of textile dyeing wastewater containing three commercial reactive azo dyes: Effect of number of stages and bioreactor type

doi:10.1016/j.cjche.2020.10.006

中国化学工程学报 ›› 2021, Vol. 39 ›› Issue (11): 228-239.DOI: 10.1016/j.cjche.2020.10.006

• Biotechnology and Bioengineering • 上一篇下一篇

Anaerobic-aerobic processes for the treatment of textile dyeing wastewater containing three commercial reactive azo dyes: Effect of number of stages and bioreactor type

Banafsheh Azimi¹, Elham Abdollahzadeh-Sharghi², Babak Bonakdarpour¹

1 Chemical Engineering Department, Amirkabir University of Technology, Tehran, Iran;
2 Environmental Group, Energy Department, Materials and Energy Research Center, Alborz, Iran

收稿日期:2020-06-08 修回日期:2020-09-13 出版日期:2021-11-28 发布日期:2021-12-27
通讯作者: Elham Abdollahzadeh-Sharghi, Babak Bonakdarpour
基金资助:
The present study was supported by Takmiliran textile dyeing factory (272219601); and Materials and Energy Research Center (MERC) (99392003).

Anaerobic-aerobic processes for the treatment of textile dyeing wastewater containing three commercial reactive azo dyes: Effect of number of stages and bioreactor type

Banafsheh Azimi¹, Elham Abdollahzadeh-Sharghi², Babak Bonakdarpour¹

1 Chemical Engineering Department, Amirkabir University of Technology, Tehran, Iran;
2 Environmental Group, Energy Department, Materials and Energy Research Center, Alborz, Iran

Received:2020-06-08 Revised:2020-09-13 Online:2021-11-28 Published:2021-12-27
Contact: Elham Abdollahzadeh-Sharghi, Babak Bonakdarpour
Supported by:
The present study was supported by Takmiliran textile dyeing factory (272219601); and Materials and Energy Research Center (MERC) (99392003).

摘要/Abstract

摘要： In this study, the effect of number of stages and bioreactor type on the removal performance of a sequential anaerobic-aerobic process employing activated sludge for the treatment of a simulated textile dyeing wastewater containing three commercial reactive azo dyes was considered. Two stage processes performed better than one stage ones, both in terms of overall organic and color removal, as well as the higher contribution of anaerobic stage to the overall removal performance, thereby making them a more energy efficient option. The employment of a moving bed sequencing batch biofilm reactor, which uses both suspended and attached biomass, for the implementation of the anaerobic stage of the process, was compared with a sequencing batch reactor that only employs suspended biomass. The results showed that, although there was no meaningful difference in biomass concentration between the two bioreactors, the latter reactor had better performance in terms of chemical oxygen demand (COD) removal efficiency and rate and color removal rate. Further exploratory tests revealed a difference between the roles of suspended and attached bacterial populations, with the former yielding better color removal whilst the latter had better COD removal performance. The sequential anaerobic-aerobic process, employing an aerobic membrane bioreactor in the aerobic stage resulted in COD and color removal of 77.1±7.9% and 79.9±1.5%, respectively. The incomplete COD and color removal was attributed to the presence of soluble microbial products in the effluent and the autoxidation of dye reduction metabolites, respectively. Also, aerobic partial mineralization of the dye reduction metabolites, was experimentally observed.

关键词: Wastewater, Anaerobic, Aerobic, Anaerobic moving bed sequencing batch biofilm reactor, Anaerobic sequencing batch reactor, Aerobic membrane bioreactor

Abstract: In this study, the effect of number of stages and bioreactor type on the removal performance of a sequential anaerobic-aerobic process employing activated sludge for the treatment of a simulated textile dyeing wastewater containing three commercial reactive azo dyes was considered. Two stage processes performed better than one stage ones, both in terms of overall organic and color removal, as well as the higher contribution of anaerobic stage to the overall removal performance, thereby making them a more energy efficient option. The employment of a moving bed sequencing batch biofilm reactor, which uses both suspended and attached biomass, for the implementation of the anaerobic stage of the process, was compared with a sequencing batch reactor that only employs suspended biomass. The results showed that, although there was no meaningful difference in biomass concentration between the two bioreactors, the latter reactor had better performance in terms of chemical oxygen demand (COD) removal efficiency and rate and color removal rate. Further exploratory tests revealed a difference between the roles of suspended and attached bacterial populations, with the former yielding better color removal whilst the latter had better COD removal performance. The sequential anaerobic-aerobic process, employing an aerobic membrane bioreactor in the aerobic stage resulted in COD and color removal of 77.1±7.9% and 79.9±1.5%, respectively. The incomplete COD and color removal was attributed to the presence of soluble microbial products in the effluent and the autoxidation of dye reduction metabolites, respectively. Also, aerobic partial mineralization of the dye reduction metabolites, was experimentally observed.

Key words: Wastewater, Anaerobic, Aerobic, Anaerobic moving bed sequencing batch biofilm reactor, Anaerobic sequencing batch reactor, Aerobic membrane bioreactor

Banafsheh Azimi, Elham Abdollahzadeh-Sharghi, Babak Bonakdarpour. Anaerobic-aerobic processes for the treatment of textile dyeing wastewater containing three commercial reactive azo dyes: Effect of number of stages and bioreactor type[J]. 中国化学工程学报, 2021, 39(11): 228-239.

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Anaerobic-aerobic processes for the treatment of textile dyeing wastewater containing three commercial reactive azo dyes: Effect of number of stages and bioreactor type

Anaerobic-aerobic processes for the treatment of textile dyeing wastewater containing three commercial reactive azo dyes: Effect of number of stages and bioreactor type

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