Toxicity of copper to acetoclastic and hydrogenotrophic activities of methanogens and sulfate reducers in anaerobic sludge

Karri, Srilakshmi; Sierra-Álvarez, Reyes; Field, Jim A.

doi:10.1016/j.chemosphere.2005.04.016

Cited by 91 publications

(55 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Zinc, chromium, nickel, cadmium and copper are usually reported as the most toxic heavy metals that may occur in UASB reactors [7,22,26,38]. Their reported toxic concentrations (based on nominal metal added) are, however, substantially higher (order of magnitude of mmol/L) than the IC 50 values documented in the present study for cobalt (Table 5).…”

Section: Role Of Speciation In Cobalt Toxicitycontrasting

confidence: 54%

“…Moreover, dosing trace metals at a too high concentration can cause inhibition of the methanogenic process [33]. Although heavy metal toxicity in UASB reactors has been studied abundantly, reported values of toxic concentrations vary considerably between different authors [7,22,26]. This is due to the fact that most authors report the total cobalt concentration in the liquid phase, not considering cobalt speciation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cobalt toxicity in anaerobic granular sludge: influence of chemical speciation

Bartacek

Fermoso

Baldó-Urrutia

et al. 2008

J Ind Microbiol Biotechnol

View full text Add to dashboard Cite

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.

show abstract

Section: Role Of Speciation In Cobalt Toxicitycontrasting

confidence: 54%

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

View full text Add to dashboard Cite

show abstract

“…These concentrations are several orders of magnitude lower compared to 50% inhibitory values reported for copper(II) which generally range from a few ppm to as much as 100 mg l À1 (Karri et al 2006;Utgikar et al 2001). The inoculum of the MR and TR systems consisted of sulfate-reducing sludge in the form of granular biofilms.…”

Section: Reactor Operationmentioning

confidence: 99%

“…Sulfide was analyzed colorimetrically (Trüper and Schlegel 1964). Copper was determined by inductively coupled plasma-mass spectroscopy (Karri et al 2006). COD (colorimetric micro-method) and VSS content were determined according to standard methods (APHA 1998).…”

Section: Methodsmentioning

confidence: 99%

Molecular characterization of mesophilic and thermophilic sulfate reducing microbial communities in expanded granular sludge bed (EGSB) reactors

et al. 2007

Self Cite

View full text Add to dashboard Cite

The microbial communities established in mesophilic and thermophilic expanded granular sludge bed reactors operated with sulfate as the electron acceptor were analyzed using 16S rRNA targeted molecular methods, including denaturing gradient gel electrophoresis, cloning, and phylogenetic analysis. Bacterial and archaeal communities were examined over 450 days of operation treating ethanol (thermophilic reactor) or ethanol and later a simulated semiconductor manufacturing wastewater containing citrate, isopropanol, and polyethylene glycol 300 (mesophilic reactor), with and without

show abstract

“…It is well-known that the use of the water drainage basins are the primary sources for anthropogenic unloads; it represents a risk for the human health, particularly the pollution caused by the high concentrations of some heavy metals, such as, zinc (Zn), nickel (Ni), chromium (Cr), lead (Pb) and copper (Cu) [18,19,20]. Those metals go through the aquatic environment principally by direct loads of industrial sources, soils and sediments and are distributed in the water, biota, being the mining industry one of the most important source [21,22,23].…”

Section: Introductionmentioning

confidence: 99%