Removal of metals and fate of N and P in the bacterial leaching of aerobically digested sewage sludge

Couillard, Denis; Mercier, Guy

doi:10.1016/0043-1354(93)90015-a

Cited by 47 publications

(32 citation statements)

References 22 publications

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“…Most of the studies in microbial leaching have employed Thiobacillus ferrooxidans [2][3][4]11,15 or sulfur-oxidizing bacteria. 5,6,[12][13][14] The mixed cultures of T. ferrooxidans and T. thiooxidans have also been examined with or without an addition of alternative energy sources such as Fe (II) and elemental sulfur.…”

Section: Introductionmentioning

confidence: 99%

“…1 Several methods have been studied for leaching heavy metals from sewage sludge, [2][3][4][5][6][7] and they can be broken down into two categories: chemical leaching [8][9][10] and microbial leaching. [2][3][4][5][6][7][11][12][13][14][15] The chemical leaching method generally involves the use of mineral acids, such as H 2 SO 4 and HCl, at pH 1.5-2.0. 1 The solubilization of heavy metals has been greatly enhanced by heating during the treatment process.…”

Section: Introductionmentioning

confidence: 99%

“…15 However, a literature survey reveals that most of the studies on the microbial leaching of heavy metals have employed sewage sludge obtained directly from a digestion reactor in wastewater treatment facilities. [2][3][4][5][6][7]14,15 This sewage sludge has a low solids content, less than 4% (w/v). In general, the solids concentration for anaerobically digested sewage sludge has been 1.3-1.8% (w/v), and even for thickened sludge, the solids concentration has beeñ 3.8% (w/v).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Solids Concentration on Bacterial Leaching of Heavy Metals from Sewage Sludge

Cho

Ryu

Lee

et al. 2002

Journal of the Air & Waste Management Association

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Microbial metal leaching from sewage sludge (2-9% w/v) was carried out with the iron-oxidizing bacterium Thiobacillus ferrooxidans. Measurements of pH, oxidationreduction potential, and concentration of Fe 2+ indicated that T. ferrooxidans was effective in removing metals from an incubation bath containing less than 5% sludge solids concentration. Specifically, Cu leaching was completely suppressed at a high solids concentration of 9% (w/v). Results indicated that the deactivation of T. ferrooxidans at a high sludge content was mainly due to the presence of inhibiting materials such as organic matter. A mixed culture of sulfur-oxidizing bacteria was obtained by enrichment from anaerobically digested sewage sludge to enhance the efficiency of the microbial leaching process. These bacteria were much more effective in metal leaching than was iron-oxidizing T. ferrooxidans. At 9% (w/v) solids concentration, the leaching efficiencies of Zn and Cu were 78% (2.66 g/kg dry sludge) and 59% (1.36 g/kg dry sludge), respectively. Therefore, when removing heavy metals from the anaerobically digested sewage sludge, the indigenous sulfur-oxidizing bacteria isolated in the current study were more efficient than T. ferrooxidans, especially at high sludge solids concentrations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Solids Concentration on Bacterial Leaching of Heavy Metals from Sewage Sludge

Cho

Ryu

Lee

et al. 2002

Journal of the Air & Waste Management Association

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“…After treatment, therefore the sludges easily met the Quebec limits of 1000 ppm Cu, 2500 ppm Zn, 1500 ppm Mn, 180 ppm, Ni and 15 ppm Cd. The biological leaching method reduces the necessary acid input to 15% and the incubation time to 10% of those required in batch-type chemical leaching methods (Couillard & Mercier 1991;Couillard & Mercier 1993). In further experiments, leaching of Pb was greatly improved when the FeSO 4 AE7H 2 O substrate was replaced with FeCl 2 presumably due to the low solubility of lead sulfate.…”

Section: Microbial Leachingmentioning

confidence: 88%

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides – 1. Microbial Processes and Mechanisms Affecting Bioremediation of Metal Contamination and Influencing Metal Toxicity and Transport

Tabak

Lens

Hullebusch

et al. 2005

Rev Environ Sci Biotechnol

193

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“…Un procédé d'enlèvement des métaux par sofubilisation biologique a déjà été développé à i'INRS-Eau, pour les boues d'usine d'épuration (COUILLARD et MERCIER, 1993 ;. Les coûts du procédé d'enlè-vement des métaux dans les boues sont compétitifs aux autres modes de gestion des boues (BPR, 1991) et, au cours de la dernière année, ce procédé a fait l'objet d'une étude à l'échelle pilote à I'INRS-Eau.…”

Section: -Introductionunclassified

Étude de l'enlèvement du Cd, Cu, Mn et Zn par solubilisation biologique dans les sédiments lacustres fortement contaminés

Couillard¹,

Chartier²,

Mercier³

2005

rseau

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Des essais en erlenmeyers de 0,5 L ont été faits afin d'évaluer les possibilités d'application d'un procédé de solubilisation biologique aux sédiments. Ce procédé utilise la capacité des thiobacilles de lixivier les métaux en milieu acide. Au cours des essais, l'influence, sur la solubilisation des métaux, de la quantité de substrat (FeSO4 × 7H2O), du pourcentage d'inoculum et de la teneur en solides totaux a été suivie. La concentration de substrat n'a pas d'effet sur l'enlèvement du Cd, du Zn, du Mn et du Cu. Les taux d'enlèvement moyens pour le Cd, Zn et Mn, sont, après 46 heures, de 70 à 90 %, 90 à 100 % et 64 à 72 % pour des concentrations de substrat variant de 0 à 30 % FeSO4 × 7H2O (poids sec/poids sec). A 29 et 46 heures, des coefficients de détermination (r2) de 0,46 et 0,59 entre le pH et la concentration de FeSO4 × 7H2O, et de 0,92 et 0,55 entre le POR et la concentration de FeSO4 × 7H2O ont été trouvés. A plus forte teneur en FeSO4 × 7H2O, le POR est moins élevé, surtout au début des essais. La présence des ions ferreux en plus grande quantité expliquerait les plus faibles valeurs du potentiel-rédox. A 20 % d'inoculum, la solubilisation des métaux est optimale avec une solubili- sation de 86 % pour le Cd et 73 % pour le Cu et le Mn. La forte corrélation entre le POR, le pH et le pourcentage d'inoculum (r2 à 29, 46 et 70 heures de 0,94, 0,94 et 0,63 pour le POR et le pourcentage d'inoculum et de 0,80, 0,69 et 0,60 pour le pH et le pourcentage d'inoculum), a permis d'établir une corrélation entre le POR, le pH et la solubilisation du Cu. Les seuils trouvés permettant une solubilisation du Cu supérieure à 10 % sont un pH de 3,75 et un POR de 260 mV.L'augmentation des solides totaux (ST) semble limiter le développement des thiobacilles et diminue les rendements de solubilisation du Cd (à 21 heures) et du Zn (à 45 heures). Ainsi, pour le Cd, les pourcentages de solubilisation passent de 71 % à 24 % pour 3 et 15 % ST, alors que dans le cas du Zn, ils diminuent de 94 % à 81 % pour 3 et 15 % ST. La solubilisation du Mn serait, pour sa part, plutôt de type chimique.In the province of Québec, the St-Lawrence Seaway as well as the harbour areas undergo frequent dredging. Each year, more than 106 cubic metres of sediments must be dredged from the st-Lawrence river. The dredged sedirnents are generally dispersed in the water column. However, heavy metal contamination of these sediments may preclude open-water disposal and necessitate their confinement.The research work presented in this article applies to dredged sediments that are too contaminated for open-water disposal. In order to permit their safe disposal, it is necessary to have a method which effectively removes metals from these sediments. One of the effective methods of metal removal from contaminated sediments could be a microbial solubilization process, which was developed at INRS-Eau for sewage sludge decontamination and which has been tested on a pilot scale during the past year. In order to appty such a process to decontaminate sediments, it was nec...

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Removal of metals and fate of N and P in the bacterial leaching of aerobically digested sewage sludge

Cited by 47 publications

References 22 publications

Effect of Solids Concentration on Bacterial Leaching of Heavy Metals from Sewage Sludge

Effect of Solids Concentration on Bacterial Leaching of Heavy Metals from Sewage Sludge

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides – 1. Microbial Processes and Mechanisms Affecting Bioremediation of Metal Contamination and Influencing Metal Toxicity and Transport

Étude de l'enlèvement du Cd, Cu, Mn et Zn par solubilisation biologique dans les sédiments lacustres fortement contaminés

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