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Biodegradation of selected azo dyes under methanogenic conditions
Biological treatment of wastewaters discharged by the textile industry could potentially be problematic due to the high toxicity and recalcitrance of the commonly-used azo dye compounds. In the present report, the fate of two azo dyes under methanogenic conditions was studied. Mordant Orange 1 (MO1)...
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| Published in: | Water science and technology 1997, Vol.36 (6-7), p.65-72 |
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| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
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| container_end_page | 72 |
| container_issue | 6-7 |
| container_start_page | 65 |
| container_title | Water science and technology |
| container_volume | 36 |
| creator | Razo-Flores, Elías Luijten, Maurice Donlon, Brian Lettinga, Gatze Field, Jim |
| description | Biological treatment of wastewaters discharged by the textile industry could potentially be problematic due to the high toxicity and recalcitrance of the commonly-used azo dye compounds. In the present report, the fate of two azo dyes under methanogenic conditions was studied. Mordant Orange 1 (MO1) and Azodisalicylate (ADS) were completely reduced and decolorised in continuous UASB reactors in the presence of cosubstrates. In the MO1 reactor, both 5-aminosalicylic acid (5-ASA) and 1,4-phenylenediamine were identified as products of azo cleavage. After long adaptation periods, 5-ASA was detected at trace levels, indicating further mineralization. ADS, a pharmaceutical azo dye constructed from two 5-ASA units, was completely mineralized even in the absence of cosubstrate, indicating that the metabolism of 5-ASA could provide the reducing equivalents needed for the azo reduction. Batch experiments confirmed the ADS mineralization. These results demonstrate that some azo dyes could serve as a carbon, energy, and nitrogen source for anaerobic bacteria. |
| doi_str_mv | 10.1016/S0273-1223(97)00508-8 |
| format | article |
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In the present report, the fate of two azo dyes under methanogenic conditions was studied. Mordant Orange 1 (MO1) and Azodisalicylate (ADS) were completely reduced and decolorised in continuous UASB reactors in the presence of cosubstrates. In the MO1 reactor, both 5-aminosalicylic acid (5-ASA) and 1,4-phenylenediamine were identified as products of azo cleavage. After long adaptation periods, 5-ASA was detected at trace levels, indicating further mineralization. ADS, a pharmaceutical azo dye constructed from two 5-ASA units, was completely mineralized even in the absence of cosubstrate, indicating that the metabolism of 5-ASA could provide the reducing equivalents needed for the azo reduction. Batch experiments confirmed the ADS mineralization. These results demonstrate that some azo dyes could serve as a carbon, energy, and nitrogen source for anaerobic bacteria.</description><identifier>ISSN: 0273-1223</identifier><identifier>EISSN: 1996-9732</identifier><identifier>DOI: 10.1016/S0273-1223(97)00508-8</identifier><language>eng</language><publisher>London: Elsevier Ltd</publisher><subject>Adaptation ; Anaerobic bacteria ; Anaerobic degradation ; Anaerobic digestion ; Azo dyes ; Azodisalicylate ; Bacteria ; Biodegradation ; Biological treatment ; Bioreactors ; Decoloring ; Dyes ; Granular sludge ; Metabolism ; Methanogenic conditions ; Methanogens ; Mineralization ; Mordant Orange 1 ; Phenylenediamine ; Reactors ; Reduction ; Textile industry ; Toxicity ; Trace levels ; UASB reactor ; Upflow anaerobic sludge blanket reactors ; Wastewater treatment</subject><ispartof>Water science and technology, 1997, Vol.36 (6-7), p.65-72</ispartof><rights>1997 International Association on Water Quality</rights><rights>Copyright IWA Publishing Sep 1997</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c436t-1e727a1f2075da623c291432c55c384c3144aec7d7236fa4611e9bd03234ebf53</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>309,310,314,780,784,789,790,4024,4050,4051,23930,23931,25140,27923,27924,27925</link.rule.ids></links><search><contributor>Noike, T</contributor><contributor>Tilche, A</contributor><contributor>Hanaki, K (eds)</contributor><creatorcontrib>Razo-Flores, Elías</creatorcontrib><creatorcontrib>Luijten, Maurice</creatorcontrib><creatorcontrib>Donlon, Brian</creatorcontrib><creatorcontrib>Lettinga, Gatze</creatorcontrib><creatorcontrib>Field, Jim</creatorcontrib><title>Biodegradation of selected azo dyes under methanogenic conditions</title><title>Water science and technology</title><description>Biological treatment of wastewaters discharged by the textile industry could potentially be problematic due to the high toxicity and recalcitrance of the commonly-used azo dye compounds. In the present report, the fate of two azo dyes under methanogenic conditions was studied. Mordant Orange 1 (MO1) and Azodisalicylate (ADS) were completely reduced and decolorised in continuous UASB reactors in the presence of cosubstrates. In the MO1 reactor, both 5-aminosalicylic acid (5-ASA) and 1,4-phenylenediamine were identified as products of azo cleavage. After long adaptation periods, 5-ASA was detected at trace levels, indicating further mineralization. ADS, a pharmaceutical azo dye constructed from two 5-ASA units, was completely mineralized even in the absence of cosubstrate, indicating that the metabolism of 5-ASA could provide the reducing equivalents needed for the azo reduction. Batch experiments confirmed the ADS mineralization. These results demonstrate that some azo dyes could serve as a carbon, energy, and nitrogen source for anaerobic bacteria.</description><subject>Adaptation</subject><subject>Anaerobic bacteria</subject><subject>Anaerobic degradation</subject><subject>Anaerobic digestion</subject><subject>Azo dyes</subject><subject>Azodisalicylate</subject><subject>Bacteria</subject><subject>Biodegradation</subject><subject>Biological treatment</subject><subject>Bioreactors</subject><subject>Decoloring</subject><subject>Dyes</subject><subject>Granular sludge</subject><subject>Metabolism</subject><subject>Methanogenic conditions</subject><subject>Methanogens</subject><subject>Mineralization</subject><subject>Mordant Orange 1</subject><subject>Phenylenediamine</subject><subject>Reactors</subject><subject>Reduction</subject><subject>Textile industry</subject><subject>Toxicity</subject><subject>Trace levels</subject><subject>UASB reactor</subject><subject>Upflow anaerobic sludge blanket 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| identifier | ISSN: 0273-1223 |
| ispartof | Water science and technology, 1997, Vol.36 (6-7), p.65-72 |
| issn | 0273-1223 1996-9732 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_29615243 |
| source | Alma/SFX Local Collection |
| subjects | Adaptation Anaerobic bacteria Anaerobic degradation Anaerobic digestion Azo dyes Azodisalicylate Bacteria Biodegradation Biological treatment Bioreactors Decoloring Dyes Granular sludge Metabolism Methanogenic conditions Methanogens Mineralization Mordant Orange 1 Phenylenediamine Reactors Reduction Textile industry Toxicity Trace levels UASB reactor Upflow anaerobic sludge blanket reactors Wastewater treatment |
| title | Biodegradation of selected azo dyes under methanogenic conditions |
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