Trace Metals in Anaerobic Granular Sludge Reactors: Bioavailability and Dosing Strategies

Zandvoort, Marcel H.; Hullebusch, Eric D. van; Fermoso, Fernando G.; Lens, Piet N.L.

doi:10.1002/elsc.200620129

Cited by 157 publications

(76 citation statements)

References 87 publications

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“…Cobalt, nickel, iron, copper, zinc and manganese are considered as the most important trace metals for methanogens [9,12,32,36]. Especially cobalt was many times reported as a very important micronutrient, as the cobalt-containing cofactors (vitamin B 12 ) play a key role in the methylotrophic methanogenic pathway [10,11,47]. It has often been reported as a reason for failure of labscale reactors [10,46] and as a limiting factor in full-scale UASB reactors [47].…”

Section: Introductionmentioning

confidence: 99%

“…Especially cobalt was many times reported as a very important micronutrient, as the cobalt-containing cofactors (vitamin B 12 ) play a key role in the methylotrophic methanogenic pathway [10,11,47]. It has often been reported as a reason for failure of labscale reactors [10,46] and as a limiting factor in full-scale UASB reactors [47]. Trace metals are dosed in excess in practice in industrial wastewater treatment plants to overcome problems associated with the lack of micronutrients.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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 size of this fraction is important in determining the availability of essential trace nutrients or toxicity of metals. It is difficult to measure and there is little evidence to relate metal speciation and metal bioavailability in wastewater treatment systems (Zandvoort et al, 2006). Sequential chemical extractions give an insight into metal dynamics in wastewater sludges.…”

Section: Discussionmentioning

confidence: 99%

“…The chemical extractants are applied in order of increasing aggressivity to divide the metals into fractions that represent their ease of extraction; the most readily extractable being at the beginning of the sequence and the most resistant, for example, the sulfide precipitates, towards the end. Hence, it can be assumed that biological availability of the metal fractions is greatest in the initial fractions and the metals (or phosphorus) become increasingly unavailable as the fractions progress through the sequence (Aquino and Stuckey, 2007;Carliell-Marquet, 2001;Zandvoort et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…These metals are, therefore, only bioavailable if the wastewater micro-organisms have a stronger affinity for the metal than the complexing agent (Callander and Barford, 1983). Previous researchers have concluded that precipitated metals are not readily bioavailable to micro-organisms (Aquino and Stuckey, 2007;Callander and Barford, 1983;Gonzalez-Gil et al, 2002;Hoban and van den Berg, 1979;Mosey et al, 1971;Pfeffer and White, 1964;Zandvoort et al, 2006), which corresponds to their resistance to extraction.…”

Section: Discussionmentioning

confidence: 99%

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Inorganic profiles of chemical phosphorus removal sludge

Carliell-Marquet

Smith

Oikonomidis

et al. 2010

Proceedings of the Institution of Civil Engineers - Water Manag

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Iron dosing is commonly used to remove phosphorus from wastewater but little is known about how this changes the distribution of iron, phosphorus, calcium, magnesium and trace metals in activated and digested sludge. This research compared the inorganic profiles of sludge from full-scale processes (activated sludge and anaerobic digestion) with and without iron dosing, with the aim of identifying changes in inorganic distribution resulting from iron dosing. Sludge phosphorus and metals were fractionated using sequential chemical extraction. Bioavailable iron was lower in iron-dosed activated sludge, as was bioavailable phosphorus (6·5 g/kg compared with 1·8 g/kg), with most of the iron and phosphorus bound as iron-hydroxy-phosphates. Similar results were found for anaerobically digested sludge after iron dosing; iron and phosphorus in the sludge increased by 4 and 1·35 times, respectively, but bioavailability was decreased. The ratio of chemical oxygen demand to bioavailable phosphorus in the digester was 840 : 1 after iron dosing. By contrast, calcium, magnesium, copper and zinc were increasingly bioavailable in the digester after iron dosing. The reported changes were linked to the iron content of the sludge; hence the level of iron dosing is key to minimising changes in sludge inorganic profiles.

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Mineral substances and macronutrients in the anaerobic conversion of biomass: An impact evaluation

Vintiloiu

Lemmer²,

Oechsner³

et al. 2012

Engineering in Life Sciences

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Optimal nutrient supply in the digester is essential for efficient biogas production. The aim of this study was to analyze the effects of various micro‐ and macronutrients on the process stability by a field test. The digestates of 25 biogas plants across the federal state of Baden‐Württemberg, Germany, were investigated. Collected data including trace elements, macronutrients, and volatile fatty acids (VFA) concentrations, as well as the organic loading rate and hydraulic retention time were subjected to statistical analysis. High variations in the concentrations within the different biogas plants were observed. Statistically significant effects of substrate constituents and process parameters on the stability of the anaerobic digestion process were found. Several micro‐ and macronutrients and the relationships between these elements, as well as the process parameters propionic acid, acetic acid, and acetic acid equivalent were tested. Ni, Mo, and S had a consistent statistically significant effect, while the organic loading rate and Se only showed an effect limited to the acetic acid concentration and the acetic acid equivalent. No statistically significant effect could be shown for Fe, Co, and Na. Most of the significant interactions between the tested elements contained Ni, Fe, and Co. This shows that a balanced relation between the concentrations of these elements is of greater importance than the presence of individual elements for a digester to be able to operate at high organic loading rates and maintain low VFA concentrations.

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Trace Metals in Anaerobic Granular Sludge Reactors: Bioavailability and Dosing Strategies

Cited by 157 publications

References 87 publications

Cobalt toxicity in anaerobic granular sludge: influence of chemical speciation

Cobalt toxicity in anaerobic granular sludge: influence of chemical speciation

Inorganic profiles of chemical phosphorus removal sludge

Mineral substances and macronutrients in the anaerobic conversion of biomass: An impact evaluation

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