Nonylphenol polyethoxylate degradation in aqueous waste by the use of batch and continuous biofilm bioreactors |
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Authors: | Diana Di Gioia Luigi Sciubba Claudia Barberio Stefania Frassinetti |
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Affiliation: | a Department of Applied Chemistry and Material Science, University of Bologna, Via Terracini 28, 40131 Bologna, Italy b Department of Animal Biology and Genetics, University of Florence, via Romana 17, 50125 Florence, Italy c National Research Council, Institute of Agricultural Biology and Biotechnology (IBBA), Section of Pisa, Via Moruzzi 1, 56124, Pisa, Italy |
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Abstract: | An aerobic bacterial consortium (Consortium A) was recently obtained from textile wastewater and was capable of degrading 4-nonylphenol and nonylphenol polyethoxylates (NPnEOs). In the perspective of developing a biotechnological process for the treatment of effluents from activated sludge plants fed with NPnEO contaminated wastewater, the capability of Consortium A of biodegrading an industrial mixture of NPnEOs in the physiological condition of immobilized cells was investigated. Two identically configured packed bed reactors were developed by immobilizing the consortium on silica beads or granular activated carbon. Both reactors were tested in batch and continuous mode by feeding them with water supplemented with NPnEOs. The two reactors were monitored through chemical, microbiological and molecular integrated methodology. Active biofilms were generated on both immobilization supports. Both reactors displayed comparable NPnEO mineralization under batch and continuous conditions. FISH analyses evidenced that the biofilms evolved with time by changing the reactor operation mode and the organic load. Taken together, the data collected in this study provide a preliminary strong indication on the feasibility of Consortium A-based biofilm technology for the decontamination of NPnEO containing effluents. |
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Keywords: | Nonylphenol ethoxylates Wastewater Packed bed bioreactors Biofilm FISH |
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