Effects of nitrobenzene and zinc on acetate utilizing methanogens

Bhattacharya, Sanjoy K.; Qu, Mingbo; Madura, Richard L.

doi:10.1016/s0043-1354(96)00194-7

Cited by 18 publications

(8 citation statements)

References 2 publications

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“…The culture in the chemostat performed higher rates of CF biotransformation when it was acclimatized with higher in¯uent CF concentrations. The Effects of nitrobenzene and zinc on acetate-utilizing methanogens were evaluated by Bhattacharya et al 72 Ten mg dm À3 of nitrobenzene seemed to have no effect on total gas production, while 20 and 30 mg dm À3 of nitrobenzene both caused reversible inhibition in the methanogenic system. Ten mg dm À3 of zinc together with 10 mg dm À3 of nitrobenzene partially affected methanogenesis and in addition to 20 mg dm À3 of nitrobenzene, 10 and 20 mg dm À3 of zinc caused failure of methanogenesis.…”

Section: Inhibition and Toxicitymentioning

confidence: 99%

Two‐phase anaerobic digestion processes: a review

Demirel

Yenigün

2002

J of Chemical Tech & Biotech

347

144

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This review provides a detailed comparative summary of the recent and current research activities in the area of two-phase anaerobic digestion processes. The acid phase and the methane phase are ®rst evaluated, individually, from microbiological, kinetic and modelling, process optimization, operation and control, inhibition, and toxicity points of view. The overall process performance is subsequently evaluated as a whole. Finally, areas requiring further research are determined.

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Section: Inhibition and Toxicitymentioning

confidence: 99%

Two‐phase anaerobic digestion processes: a review

Demirel

Yenigün

2002

J of Chemical Tech & Biotech

347

144

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“…Cobalt was chosen as a model for essential trace metals for methanogenesis. The borders between its nutritional requirement [3,46] and toxicity is very narrow; although so far no toxic concentrations have been reported for anaerobic granular sludge. Therefore, the present study aimed to determine cobalt toxicity data for methanol fed anaerobic granular sludge based on changes in specific methanogenic activity (SMA) upon exposure to various cobalt concentrations.…”

Section: Introductionmentioning

confidence: 99%

Cobalt toxicity in anaerobic granular sludge: influence of chemical speciation

Bartacek

Fermoso

Baldó-Urrutia

et al. 2008

J Ind Microbiol Biotechnol

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The influence of cobalt speciation on the toxicity of cobalt to methylotrophic methanogenesis in anaerobic granular sludge was investigated. The cobalt speciation was studied with three different media that contained varying concentrations of complexing ligands [carbonates, phosphates and ethylenediaminetetraacetic acid (EDTA)]. Three fractions (nominal added, dissolved and free) of cobalt were determined in the liquid media and were correlated with data from batch toxicity experiments. The average concentration of cobalt that was required for 50% inhibition of methanogenic activity (IC 50 ) for free Co 2? in the three sets of measurements was 13 lmol/L with a standard deviation of 22% and a similarity of 72% between the data obtained in the three different media for the range of cobalt concentrations investigated. The standard deviation of the IC 50 for the other two fractions was much higher, i.e. 85 and 144% for the added cobalt and dissolved cobalt, respectively, and the similarity was almost 0% for both fractions. Complexation (and precipitation) with EDTA, phosphates and carbonates was shown to decrease the toxicity of cobalt on methylotrophic methanogenesis. The free cobalt concentration is proposed to be the key parameter to correlate with cobalt toxicity. Thus, the toxicity of cobalt to granular sludge can be estimated based on the equilibrium-free cobalt concentration.

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“…Studies have shown that copper (Doelman and Haanstra, 1979;Rogers and Li, 1985;Jana and Bhattacharya, 1988;Burkhardt et al, 1993;Bardgett and Saggar, 1994;Jones and Muehlchen, 1994;Kuo and Sharak Genther, 1996;Madoni et ai, 1996;Beyenal et al, 1997;Knight et al, 1997), lead (Doelman and Haanstra, 1979;Tyagi, 1985;Jana and Bhattacharya, 1988;Burkhardt et a!, 1993;Madoni et al, 1996) and zinc (Doelman and Haanstra, 1979;Rogers and Li, 1985;Tyagi, 1985;Dean-Ross, 1990;Burkhardt et al, 1993;Jones and Muehlchen, 1994;Bhattacharya et al, 1996;Madoni et al, 1996;Beyenal et al, 1997;Knight et al, 1997) can inhibit the growth and/or enzyme activities of micro-organisms.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Metals on Biological Remediation of Munitions-Contaminated Soil

Roberts¹,

Venkataraman²,

Pendharkar³

1998

Environmental Engineering Science

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The effects of copper, iron, lead, and zinc on the treatment procedure developed to anaerobically remove munitions compounds from contaminated soils were examined. Soil slurry reactors are fed an external carbon source to cause oxygen depletion and create anaerobic conditions, then the anaerobic degradation of munitions compounds by anaerobes present in a soil inoculum occurs. Previous experiments have shown the process to be complete by 14 days. None of the metals tested affected the creation of anaerobic conditions and anaerobic removal of TNT from contaminated soil. The removal of the intermediates of TNT metabolism, 4-amino-2,6-dinitrotoluene, and 2,4-diamino-6nitrotoluene as well as hexahydro-l,3,5-trinitro-l,3,5,-triazine (RDX) was affected by the presence of some metals, most notably copper. Iron did not inhibit or stimulate the degradation process. Zinc (1.5 mg Zn/g soil) delayed the complete removal of the second intermediate of TNT degradation 2,4diamino-6-nitrotoluene, by 8 days. Lead (greater than 1 mg Pb/g soil) delayed the complete metabolism of 2,4-diamino-6-nitrotoluene and RDX by as many as 9 days. The lowest concentration of copper used (4 mg Cu/g soil) completely prevented the removal of 2,4-diamino-6-nitrotoluene and RDX but not 4-amino-2,6-dinitrotoluene. Copper, at 8 and 12 mg Cu/g soil, completely prevented the removal of 4-amino-2,6-dinitrotoluene, 2,4-diamino-6-nitrotoluene and RDX.

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Effects of nitrobenzene and zinc on acetate utilizing methanogens

Cited by 18 publications

References 2 publications

Two‐phase anaerobic digestion processes: a review

Two‐phase anaerobic digestion processes: a review

Cobalt toxicity in anaerobic granular sludge: influence of chemical speciation

The Effect of Metals on Biological Remediation of Munitions-Contaminated Soil

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