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Bio-removal of Azo Dyes: A Review
Abstract
Synthetic dyes are widely used in textile, paper, food, cosmetics and pharmaceutical industries with the textile industry as the largest consumer. Among all the available synthetic dyes, azo dyes are the largest group of dyes used in textile industry. Textile dyeing and finishing processes generate a large amount of dye containing wastewater which is one of the main sources of water pollution problems worldwide. Several physico-chemical methods have been applied to the treatment of textile wastewater but these methods have many limitations due to high cost, low efficiency and secondary pollution problems. As an alternative to physico-chemical methods, biological methods comprise bacteria, fungi, yeast, algae and plants and their enzymes which received increasing interest due to their cost effectiveness and eco-friendly nature. Decolorization of azo dyes by biological processes may take place either by biosorption or biodegradation. A variety of reductive and oxidative enzymes may also be involved in the degradation of dyes. This review provides an overview of decolorization and degradation of azo dyes by biological processes and establishes the fact that these microbial and plant cells are significantly effective biological weapon against the toxic azo dyes. Int. J. Appl. Sci. Biotechnol. Vol 5(2): 108-126
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Algae are among the most favorable bio-sorbents because they have high biosorption capacity and are easily available in large amounts.
“Algae are considered one of the sources of the most favorable types of bio-sorbents because they have high biosorption capacity and are easily available in large amounts (Singh and Singh, 2017;Azam et al., 2020).”
From Biomass-Based Adsorbents for Removal of Dyes From Wastewater: A Review (2021) · cites this paper as Singh and Singh, 2017
The Biosorption section describes algae as potent biosorbents, citing their availability in fresh and salt water, relatively high surface area, and high binding affinity. It does not establish that algae are easily available in large amounts; availability across habitats is not evidence of quantity. (LLM, conf=0.83)
Experimental — accuracy not yet measuredCombining biosorption with biodegradation by living cells can improve dye removal performance beyond high sorption capacity alone.
“Besides the high sorption capacity toward dye, the dye removal performance can be improved by combining the biosorption process with the biodegradation processes by living cells (Singh and Singh, 2017;Roy et al., 2018).”
From Biomass-Based Adsorbents for Removal of Dyes From Wastewater: A Review (2021) · cites this paper as Singh and Singh, 2017
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Metadata
- Authors
- Singh, P. K., & Singh, R. L.
- Venue
- International Journal of Applied Sciences and Biotechnology
- Publisher
- Nepal Journals Online (JOL)
- Published
- 2017-06-29
- Volume
- 5
- Issue
- 2
- Pages
- 108-126
- ISSN
- 2091-2609
- Cited by
- 173
- References
- 0
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