Optimum residence time (in CSTR and airlift reactor) for bacterial leaching of metals from anaerobic sewage sludge

Couillard, Denis; Mercier, Guy

doi:10.1016/0043-1354(91)90031-k

Cited by 77 publications

(31 citation statements)

References 13 publications

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“…A biological solubilization process for the removal of metals from sewage sludges has been developed at the INRS-Eau (Couillard and Mercier, 1993;Couillard et al, 1991a, b;Couillard and Mercier, 1991;Couillard and Chartier, 1991; 9 Author for correspondence.…”

Section: Introductionmentioning

confidence: 99%

Biological processes: The effects of initial pH, percentage inoculum and nutrient enrichment on the solubilization of sediment bound metals

Chartier

Couillard

1997

Water Air Soil Pollut

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Abstract. Biological solubilization of metals in highly contaminated sediments (Lachine Canal, Montreal, P.Q., Canada) was tested in 500 mL batches. The biological process uses the leaching capacity of Thiobacilli. Batch experiments were performed to determine the influence of initial pH, the percentage of inoculum, and the addition of nitrogen and phosphate on the efficiency of the process. Similar metal recoveries were obtained at either of the initial pH values (pH 4.0 and pH 4.5). The addition of 20% inoculum (v/v) appears to result in acceptable yields over a short time period (24-48 hours). Solubilization of Cu is strongly correlated with the presence of bacteria (r 2 increase with time up to 0.90 after 53h). In the case of Zn (within first 6 hours) and Pb Cat the beginning), the chemical environment appears to be the main factor controlling solubilization of these elements (r 2 up to 0.99). The addition of nutrients had no affect on the production of Thiobacilli, but the addition of NH4 reduced the solubilization of Zn, Pb (r 2 up to 0.90) and at the beginning, the solubilization of Cu (r2=0.67). While the addition of PO43-diminished the solubilization of Zn, Pb and Cu (r 2 up to 0.96). Upon addition of substrate (FeSO4.7H20), the growth of Thiobacilli already present in the sediments is favored. The application of this process to sediments appears feasible, as Zn and Cu levels were at acceptable levels following treatment. Further studies are necessary to improve the removal of Pb.

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Section: Introductionmentioning

confidence: 99%

Biological processes: The effects of initial pH, percentage inoculum and nutrient enrichment on the solubilization of sediment bound metals

Chartier

Couillard

1997

Water Air Soil Pollut

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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: 89%

“…Unfortunately, approximately 50% of the sludges in the USA and Canada do contain metals, predominantly as metal sulfides, in excess of the standards. Attempts at chemical dissolution of sludge metals, usually by addition of acids have proven costly and ineffective (Couillard & Mercier 1991).…”

Section: Microbial Leachingmentioning

confidence: 99%

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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“…When sewage sludge is used as a soil conditioner, toxic metals may limit the application rate. Literature data show that more than 50% of the sludges are unsuitable for use in agricultural areas due to their metal content (Couillard and Mercier, 1991). Metal contamination in soils amended with untreated sewage sludge has been repeatedly reported in the literature (Vooneburg and Veen, 1993).…”

mentioning

confidence: 99%

Time-saving application for sequential extraction of heavy metals by optimized BCR method and lixiviation from untreated sewage sludge

Jamali¹,

Kazi

Arain

et al. 2009

Acta Agronomica Hungarica

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This article describes an improvement in the modified BCR three-step sequential extraction procedure employed for heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) in untreated domestic waste-water sewage sludge collected from different cities in Pakistan.The BCR sequential extraction protocol requires 16 h for each step, whereas in the present work optimum recoveries of all heavy metals were attained in 10 h/step. The validity of the proposed BCR sequential extraction procedure was checked using certified reference material (BCR 483). Various parameters such as time interval (2-16 h) and sample mass (0.2-1.0 g) were studied to achieve optimum recovery of the heavy metals studied. The extracted analytes were determined by atomic absorption spectrometry. The optimum recovery of heavy metals from the certified reference material and from experimental samples was achieved at a sample mass of 0.4 g, while the time required for extraction on a mechanical shaker at 30 rpm was found to be 26-32 h. The sequence of easily available (acid-exchangeable) heavy metals was determined as Cd

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Optimum residence time (in CSTR and airlift reactor) for bacterial leaching of metals from anaerobic sewage sludge

Cited by 77 publications

References 13 publications

Biological processes: The effects of initial pH, percentage inoculum and nutrient enrichment on the solubilization of sediment bound metals

Biological processes: The effects of initial pH, percentage inoculum and nutrient enrichment on the solubilization of sediment bound metals

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

Time-saving application for sequential extraction of heavy metals by optimized BCR method and lixiviation from untreated sewage sludge

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