P-nitrophenol biodegradation by aerobic microbial granules

Applied Biochemistry and Biotechnology
E SujaVayalam P Venugopalan

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 a...Continue Reading

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Citations

Oct 19, 2012·Applied Biochemistry and Biotechnology·Liangdong ZouZheng Liu
Mar 14, 2014·Applied Biochemistry and Biotechnology·Hemant P BoraseSatish V Patil
Dec 3, 2014·Journal of Hazardous Materials·Y V NancharaiahV P Venugopalan
Jul 29, 2015·Bioresource Technology·E SujaV P Venugopalan
Jul 3, 2015·Journal of Bioscience and Bioengineering·Tulasi Venkata Krishna MohanVayalam Purath Venugopalan
Jul 3, 2013·Journal of Hazardous Materials·Isaac FernándezJulián Carrera
Aug 20, 2014·FEMS Microbiology Letters·G Kiran Kumar ReddyVayalam Purath Venugopalan

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