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Treatment of hydrocarbon-rich wastewater using oil degrading bacteria and phototrophic microorganisms in rotating biological contactor: Effect of N:P ratio

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Title Treatment of hydrocarbon-rich wastewater using oil degrading bacteria and phototrophic microorganisms in rotating biological contactor: Effect of N:P ratio
 
Creator CHAVAN, ANAL
MUKHERJI, SUPARNA
 
Subject bacteria
bioreactor
petroleum
microorganisms
biosolids
 
Description Treatment of hydrocarbon-rich industrial wastewater in bioreactors using heterotrophic microorganisms is often associated with various operational problems. In this study, a consortium of phototrophic microorganisms and a bacterium is developed on the discs of a rotating biological contactor (RBC) for treatment of wastewater containing diesel oil. The reactor was fed with oil degrading bacterium, Burkholderia cepacia and oil tolerant phototrophic microorganisms. After biofilm formation and acclimatization to 0.6% (v/v) diesel, continuous-mode operation was initiated at 21 h hydraulic retention time (HRT). Residual diesel in the effluent was 0.003%. Advantages of this system include good total petroleum hydrocarbon (TPH) removal, no soluble carbon source requirement and good settleability of biosolids. Biofilm observations revealed the predominance of B. cepacia and cyanobacteria (Phormidium, Oscillatoria and Chroococcus). The N:P ratio affected the relative dominance of the phototrophic microorganisms and bacterial culture. This ratio was a critical factor in determining the performance efficiency of the reactor. At 21 h HRT and organic loading of 27.33 g TPH/m2 d, the N:P ratio 28.5:1 and 38:1 both yielded high and almost comparable TPH and COD removal efficiencies. This study presents a feasible technology for the treatment of hydrocarbon-rich wastewater from petrochemical industries and petroleum refineries.
 
Publisher Elsevier
 
Date 2009-06-01T09:08:14Z
2011-12-08T07:31:07Z
2011-12-26T13:02:17Z
2011-12-27T05:48:15Z
2009-06-01T09:08:14Z
2011-12-08T07:31:07Z
2011-12-26T13:02:17Z
2011-12-27T05:48:15Z
2008
 
Type Article
 
Identifier Journal of Hazardous Materials 154(1-3), 63-72
0304-3894
10.1016/j.jhazmat.2007.09.106
http://hdl.handle.net/10054/1404
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1404
 
Language en