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p-Nitrophenol Biodegradation by Aerobic Microbial Granules

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Abstract

Mixed microbial consortia in the form of aerobic microbial granules (AMG) capable of xenobiotic degradation can be developed from activated sludge or by adaptation of microbial granules pre-grown on labile carbon sources. Both of these approaches were investigated for the cultivation of AMG capable of p-nitrophenol (PNP) biodegradation. Attempts to cultivate AMG from activated sludge using PNP as the sole carbon source were not successful due to poor microbial growth and washout of the inoculated activated sludge. As part of the second approach, parallel sequencing batch reactors (SBRs) were inoculated with pre-grown AMG and operated by feeding both acetate and PNP together (RA), PNP alone (RB) or acetate alone (RC). Acetate/PNP mineralization and nitrification were monitored in the three SBRs. PNP biodegradation was quickly established in both RA and RB. PNP removal rates were found to be 47 and 55 mg g VSS−1 h−1 in RA and RB, respectively. PNP biodegradation during the SBR cycle consisted of distinct lag, exponential and deceleration phases. However, with higher concentrations of PNP (>50 mg l−1), disintegration of granules was observed in RA and RB. When PNP was the sole carbon source, it inhibited the development of aerobic granules from activated sludge and caused disintegration of pre-cultivated aerobic granules. When PNP was the co-substrate along with acetate, the structural and functional integrity (including nitrification) of the granular sludge was maintained. This report highlights the importance of a labile co-substrate for maintaining the physical and functional integrity of granular sludge, when used for toxic waste degradation.

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Acknowledgements

SE is thankful to the University Grants Commission (UGC), Government of India, for providing Junior Research fellowship.

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Authors and Affiliations

  1. Biofouling and Biofilm Processes Section, Water and Steam Chemistry Division, Bhabha Atomic Research Centre, Kalpakkam, 603102, Tamil Nadu, India

    E. Suja, Y. Venkata Nancharaiah & Vayalam P. Venugopalan

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  1. E. Suja
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  2. Y. Venkata Nancharaiah
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  3. Vayalam P. Venugopalan
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Correspondence to Vayalam P. Venugopalan.

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Suja, E., Nancharaiah, Y.V. & Venugopalan, V.P. p-Nitrophenol Biodegradation by Aerobic Microbial Granules. Appl Biochem Biotechnol 167, 1569–1577 (2012). https://doi.org/10.1007/s12010-012-9594-y

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