Mass transfer studies on the reduction of Cr(VI) using calcium alginate immobilized Bacillus sp. in packed bed reactor

Kathiravan, Mathur Nadarajan; Rani, Ravikumar Karthiga; Karthick, R.; Muthukumar, Karuppan

doi:10.1016/j.biortech.2009.08.088

Cited by 74 publications

(37 citation statements)

References 27 publications

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“…EBCT affects the efficiency of removal of pollutant in a biocolumn reactor. Longer EBCT confers longer contact time, and as a result the outlet concentration of pollutant decreases with the increase in EBCT [28,30,33]. It could be due to the fact that with increasing the EBCT, the RPM of peristaltic pump decreases due to which the flow rate (mL min −1 ) of the influent waste water passed through the reactor decreases [31,32,34].…”

Section: -1 Effect Of Ebct On Removal Of Phenol and Cr(vi)mentioning

confidence: 98%

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Simultaneous removal of Cr(VI) and phenol from synthetic binary solution using consortium culture of Bacillus sp. and E. coli immobilized on tea waste biomass in packed bed reactor

Gupta

Balomajumder

2015

Korean J. Chem. Eng.

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A continuous bio column reactor was designed for the simultaneous bioaccumulation of Cr(VI) and biodegradation of phenol from their binary synthetic solution with the ratio of (2 : 1). Consortium culture of Bacillus sp. and Escherichia coli was immobilized onto tea waste biomass in the packed bed column. The metabolites formed during the biodegradation of phenol by Bacillus sp. were utilized by Escherichia coli for the bioaccumulation of Cr(VI). The considerable effect of empty bed contact time (EBCT), bed height (cm) and flow rate (mL/min) was investigated onto the simultaneous removal of Cr(VI) and phenol in the column reactor. However, after 3-4 days of continuous treatment of Cr(VI) and phenol the effect of these process parameters was not significant. Dissolved oxygen (DO) of effluent has been found to decrease with run time of packed bed column. The pH of the effluent decreased initially for 2 days but after that it became the same as the influent. A mass transfer study was carried out to calculate the pseudofirst-order rate constant for Cr(VI) and phenol, which was in good agreement with experimental results.

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Section: -1 Effect Of Ebct On Removal Of Phenol and Cr(vi)mentioning

confidence: 98%

“…The material balance for the Cr(VI) and phenol in continuous packed bed bio column reactor is given according to following equation [30,44]. (7) On integrating the above equation using the boundary conditions for Cr(VI) and phenol Cr(VI): z=0, C=C oCr(VI) (8) z=H, C=C Cr(VI)…”

Section: -1 Calculation Of First-order Biodegradation Rate Constantmentioning

confidence: 99%

Simultaneous removal of Cr(VI) and phenol from synthetic binary solution using consortium culture of Bacillus sp. and E. coli immobilized on tea waste biomass in packed bed reactor

Gupta

Balomajumder

2015

Korean J. Chem. Eng.

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“…Previously it was also reported that the Cr can be a potential problematic pollutant commonly coupled with azo dyes in waste water released from dying industries (Yusuff and Sonibare, 2004). Few species were reported to have the ability to tolerate the very high levels of Cr (Kathiravan et al, 2010;Dey and Paul, 2012;Christl et al, 2012). However elevated levels of Cr negatively influence their survival and growth (Oleszkiewicz and Sharma, 1990).…”

Section: Discussionmentioning

confidence: 99%

Effect of Chromium Forms on the Biodegradation of Reactive Black-5 Azo Dye by Psychrobacter and Klebsiella species

Khalid¹,

Arshad²,

Mahmood³

et al. 2015

IJAB

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To cite his paper: Khalid, A., J. Arshad, S. Mahmood, I. Aziz and M. Arshad, 2015 AbstractAzo dyes and chromium (Cr) are released in the wastewater of leather processing industry during tanning process. Several species of bacteria have shown ability to degrade azo dyes individually; however, presence of Cr ions in industrial effluents may affect the bacterial efficiency of removing azo dyes from waste water. In this study, biodegradation of reactive black-5 dye was studied in a mineral salts medium (MSM) liquid culture in the presence of Cr ions. Two bacterial strains Psychrobacter alimentarius KS23 and Klebsiella oxytoca N7 capable of degrading azo dyes were used individually as well as in a consortium for the degradation of azo dyes. Cr was applied in the form of K2Cr2O7, CrCl3, Cr2(SO4)3 at different concentrations (ranging from 0-250 mg L -1 ) of Cr. The results showed that presence of Cr in mineral salt medium significantly inhibited the azo dye decolorization. In the absence of Cr salts, complete decolorization of 100 mg dye L -1 was achieved by the bacterial strains in 8-12 h while up to 83% decolorization occurred in 72 h at 100 mg L -1 Cr. The rate of decolorization considerably decreased with increasing concentration of azo dye in the presence of 50 mg Cr L -1 medium. These findings imply that the existence of Cr in wastewater can significantly affect the bacterial efficiency in wastewater treatment systems to degrade azo dyes.

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“…Some studies have reported Cr(VI) reduction with immobilized bacterial species [16,18,29]. But entrapping cells in gel beads results in a decrease of biocatalytic activity caused by diffusional limitations and steric hindrance [22], a decrease of polymeric matrix strength caused by the increase of cell density, and cell leakage caused by gel surface breakage [19].…”

Section: Introductionmentioning

confidence: 99%

Encapsulation of Pannonibacter phragmitetus LSSE-09 in alginate–carboxymethyl cellulose capsules for reduction of hexavalent chromium under alkaline conditions

Luo

Yang

et al. 2011

J Ind Microbiol Biotechnol

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Cr(VI) was efficiently reduced to Cr(III) by Pannonibacter phragmitetus LSSE-09 encapsulated in liquid-core alginate-carboxymethyl cellulose capsules under alkaline conditions. Taking into account the physical properties of the capsules, the activity of encapsulated cells, and total Cr(III) concentration in the supernatant, optimal conditions (0.5% w/v sodium alginate; 2% w/v sodium carboxymethyl cellulose; 0.1 M CaCl₂; 30-min gelation time) for LSSE-09 encapsulation were determined. At optimal conditions, a relatively high reduction rate of 4.20 mg g ((dry weight))⁻¹ min⁻¹ was obtained. Total Cr(III) concentration in the supernatant was significantly decreased after reduction, because 63.7% of the formed soluble organo-Cr(III) compounds compared with those of free cells were captured by the relatively smaller porous structure of alginate capsules. The optimal pH value (9.0) for Cr(VI) reduction was not changed after encapsulation. In addition, encapsulated LSSE-09 showed no appreciable loss in activity after eight repeated cycles at 37°C, and 85.7% of its initial activity remained after 35-day storage at 4°C. The results suggest that encapsulated LSSE-09 in alginate-carboxymethyl cellulose capsules has potential biotechnological applications for the detoxification of Cr(VI)-contaminated wastewater.

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Mass transfer studies on the reduction of Cr(VI) using calcium alginate immobilized Bacillus sp. in packed bed reactor

Cited by 74 publications

References 27 publications

Simultaneous removal of Cr(VI) and phenol from synthetic binary solution using consortium culture of Bacillus sp. and E. coli immobilized on tea waste biomass in packed bed reactor

Simultaneous removal of Cr(VI) and phenol from synthetic binary solution using consortium culture of Bacillus sp. and E. coli immobilized on tea waste biomass in packed bed reactor

Effect of Chromium Forms on the Biodegradation of Reactive Black-5 Azo Dye by Psychrobacter and Klebsiella species

Encapsulation of Pannonibacter phragmitetus LSSE-09 in alginate–carboxymethyl cellulose capsules for reduction of hexavalent chromium under alkaline conditions

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