The role of colonic sulphate-reducing bacteria in the pharmacology of heavy metals

1994 ◽  
Vol 3 (4) ◽  
pp. 357-360
Author(s):  
L Bolt ◽  
D C Ellwood ◽  
M J Hill ◽  
S Wootton ◽  
J H P Watson
Keyword(s):  
Heavy Metals ◽  
Sulphate Reducing Bacteria ◽  
Reducing Bacteria

Integrated System to Biological Solubilization and Precipitation of Heavy Metals

2007 ◽  
Vol 20-21 ◽  
pp. 279-282
Author(s):  
G. Cabrera ◽  
José Manuel Gómez ◽  
Domingo Cantero
Keyword(s):  
Heavy Metals ◽  
Acid Medium ◽  
Polyurethane Foam ◽  
Acidic Medium ◽  
Integrated System ◽  
Continuous Processes ◽  
Column Reactor ◽  
Sulphate Reducing Bacteria ◽  
Biological Solubilization ◽  
Reducing Bacteria

The work consists on the study of a sulphur–oxidizing bacteria (At. thiooxidans) immobilisation over polyurethane foam and the integration of two continuous processes: the solubilization of heavy metals by acidic medium generated by sulphur-oxidizing bacteria and the subsequent precipitation of metals as sulphides with H2S biologically generated by sulphate-reducing bacteria (Desulfovibrio sp). At. thiooxidans was satisfactory immobilised over polyurethane foam and added to a column reactor. Acidic medium generated was added to a column with 50 g of an artificial contaminated sand (85 mg Cr(III), 20 mg Ni(II), 200 mg Zn(II)). The effluent of this step was collected in a reservoir tank, in which H2S from sulphate-reducing reactor was included to carry out the precipitation of metals. After 2.4 l of acid medium was passed through the column, it was observed that 14.6% of Cr(III), 26.7% of Ni(II) and 90.5% of Zn(II) were solubilized. The leachate was treated with 2.2 l of reducing medium, and 2.2% Cr(III),54% Ni(II) and 28% Zn(II) were precipitated.

The role of APS reductase, hydrogenase and sulfite reductase in biocorrosion promoted by sulphate reducing bacteria

1993 ◽  
Vol 51 (1-2) ◽  
pp. 192
Author(s):  
A.R. Lino ◽  
M.J. Feio ◽  
R. Franco ◽  
A. Pereira ◽  
C. Pinto ◽  
...  
Keyword(s):  
Sulfite Reductase ◽  
Sulphate Reducing Bacteria ◽  
Aps Reductase ◽  
Reducing Bacteria

scholarly journals Bacterial Reduction Of Barium Sulphate By Sulphate-Reducing Bacteria

2015 ◽  
Vol 14 (2) ◽  
pp. 135-140 ◽  
Author(s):  
Alena Luptáková ◽  
Ingrida Kotuličová ◽  
Magdaléna Bálintová ◽  
Štefan Demčák
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Barium Chloride ◽  
Barium Sulphate ◽  
Low Ph ◽  
Bacterial Reduction ◽  
Sulphate Reducing Bacteria ◽  
High Investment ◽  
Reducing Bacteria

AbstractAcid mine drainage (AMD) is a worldwide problem leading to contamination of water sources. AMD are characterized by low pH and high content of heavy metals and sulphates. The barium salts application presents one of the methods for the sulphates removing from AMD. Barium chloride, barium hydroxide and barium sulphide are used for the sulphates precipitation in the form of barium sulphate. Because of high investment costs of barium salts, barium sulphide is recycled from barium sulphate precipitates. It can be recycled by thermic or bacterial reduction of barium sulphate. The aim of our study was to verify experimentally the possibility of the bacterial transformation of BaSO4to BaS by sulphate-reducing bacteria. Applied BaSO4came from experiments of sulphates removal from Smolnik AMD using BaCl2.

Isolation of Mesophilic Sulphate-Reducing Bacteria from a Microbial Community: Comparative Study of the Effect of pH and Dissolved Heavy Metals on the Reduction of Sulphate

2009 ◽  
Vol 71-73 ◽  
pp. 549-552 ◽  
Author(s):  
P. Kikot ◽  
M. Viera ◽  
C. Mignone ◽  
Edgardo R. Donati
Keyword(s):  
Heavy Metals ◽  
Microbial Community ◽  
Heavy Metal Contamination ◽  
Sulphate Reducing Bacteria ◽  
Physicochemical Processes ◽  
Rivers And Lakes ◽  
Dissolved Heavy Metals ◽  
Reducing Bacteria ◽  
Low Solubility ◽  
Metallurgical Processes

Metallurgical processes and mining are the main source of heavy metal contamination of water sources, rivers and lakes. There are a large number of physicochemical processes that can be applied for the immobilization of heavy metals from a liquid matrix. However, many of them are not particularly desirable because their low selectivity and inefficiency when high volumes of low metal concentration liquids must be treated. In such conditions, alternative biological processes have shown to be more useful than traditional physicochemical processes. One of those processes, bioprecipitation of metal sulphides is relevant due to the possibility of forming stable solids (very low solubility) with small volumes compared with other solids. This process is mediated by a broad group of organisms called sulphate reducers that are able to catalyze, under anaerobic conditions, the reduction of sulphate with organic compounds as electron donors. In this paper, we study the effect of the presence of various heavy metals and the pH on the ability to reduce sulphate by sulphate-reducing bacteria. We compare the reduction of sulphate by a microbial community obtained from the effluent of a tannery with a strain isolated from that community. Our results showed that sulphate reduction was significantly affected by pH changes whereas the presence of heavy metals did not show a significant effect. In addition, metal precipitation by the isolated strain was similar than that produced by the community.

Sign in / Sign up

Export Citation Format

Share Document