Treatment of refinery wastewater using Arthrobacter chlorophenolicus A6 in an upflow packed bed reactor

CATEGORY: WASTEWATER TREATMENT 
Treatment of refinery wastewater using Arthrobacter chlorophenolicus A6 in an upflow packed bed reactor

Type	Journal Article
Author	N.K. Sahoo
Author	P.K. Ghosh
URL	http://dx.doi.org/10.1080/19443994.2014.930798
Volume	0
Issue	0
Pages	1-9
Publication	Desalination and Water Treatment
Date	June 27, 2014
Abstract	Describes treatment of refinery wastewater collected from Guwahati, India, in an upflow packed bed reactor (PBR) with immobilized Arthrobacter chlorophenolicus A6. Standard methods were employed to characterize the wastewater. Researchers determined the toxicity of the wastewater using aerobic mixed microbial consortia following the resazurin toxicity assay. Since the chemical oxygen demand (COD) level in the raw refinery wastewater was very low, the raw wastewater was spiked with a mixture of substituted phenol at different concentrations. The batch shake flask experiment revealed the COD removal efficiency to be less when the raw refinery wastewater was not spiked with nutrient. On the other hand, when supplemented with nutrients in the form of mineral salt medium, more than 98% COD removal was achieved. The PBR was operated by varying the influent phenolic concentration in the range of 250–350 mg l−1 and at a hydraulic retention time of 12.5 h. Results indicated that more than 99% pollutant removal and 94% effluent toxicity removal were achieved at a combined pollutants loading rate of 1707 mg l−1 d−1.