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Showing 1 to 20 of 21 for “"sulphate-reducing bacteria"”.
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Passive treatment of acid mine drainage with sulphate reducing bacteria
… bench-scale testing. Biological treatment with sulphate reducing bacteria (SRB) was selected, and bench-scale treatment testing was conducted using columns amended with low cost organic sources. Removal of more than 99% Cd, 93% Co, 96 % Cu, 86% Ni and 98% Zn was observed, resulting in metals …
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The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes
The mechanism of the corrosive action of sulphate reducing bacteria of the genus Desulfovibrio towards ferrous metals has been investigated. This corrosive action is anomalous when considered in the light of established knowledge of corrosion processes, since it occurs in the absence of oxygen, at …
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Die ondersoek na spesifieke bakteriegroepe in die feses van geselekteerde proefpersone
… These organisms are mainly aerobic and anaerobic bacteria. This study was limited to the isolation and cultivation of specific groups of bacteria in the human gastrointestinal tract. Eight faecal samples were examined for the presence of the following bacteria, viz ., lactobacilli, methane …
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Estudio de procesos para la solubilización y precipitación de iones metálicos contaminantes mediante bacterias azufre-oxidantes y sulfatoreductoras
… of several technologies with the aim of reducing or removing heavy metals from contaminated media in a simple and economical way, among them the bioprocess are relevant.Techniques as bioleaching, biosorption and bioprecipitation apply the microorganism capacities to modify the solubility …
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Terminal anerobic interactions in a microbial association isolated from landfill
… dioxide, although this has only been reported in sulphate-reducing bacteria (Widdel, Kohring & Mayer, 1983); and (ii) that a syntrophic association was involved in which the hydrogen produced, during hexanoate catabolism to acetate, was removed by a hydrogen-oxidising species such as a methanogen …
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Integrating Microbial Fuel Cells (MFCs) into the treatment of sulphate-rich wastewater
… electricity (Du et al., 2007). The treatment of sulphate-rich wastewater, and in particular Acid Rock Drainage (ARD), has become of increasing importance in water sparse countries like South Africa where mining is currently and has taken place. A semi-passive method of continuous ARD waste …
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Small-scale heterogeneity in sediments : experimental and modelling investigations
… to uptake associated with elevated activity of sulphate reducing bacteria; 2) modelled scenarios, with varying microniche properties, were shown to be relevant to experimental observations reported in the literature. The preferential deposition of FeS at the edge of microniches (with lifetimes …
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Metal sulphide precipitation : effect of operational parameters on particle characteristics and process efficiency
… acidic effluents high in dissolved metals and sulphate. Conventional treatment technologies rely on oxidation, neutralisation and precipitation. While these may be effective they are expensive and not sustainable in the long term. Several biological treatment technologies, based on the activity …
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A mathematical model of a high sulphate wastewater, anaerobic treatment system
High sulphate wastewaters, originating from industrial activity or from the biological oxidation of sulphide ores (acid mine drainage), cannot be discharged into the environment untreated. Apart from the high sulphate levels, these waters may be very acidic and have high dissolved heavy metal …
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Microbial ecology in deep granitic groundwater - activity and impact of viruses
… are known to influence the mortality of bacteria and archaea and biogeochemical cycles, and to have great genetic diversity. At the Äspö HRL, 105 to 107 mL-1 viral like particles were found when samples down to a depth of 450 m were studied. Using transmission electron microscopy, the …
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The production of biogenic gases in the marine environment
… could facilitate the presence of anaerobic bacteria, or anaeorobic bacterial activity, in the predominantly aerobic pelagic environment. The occurrence of methanogenic Archaea<br/>specifically associated with copepod faecal pellets from mono-species cultures of copepods, environmental …
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USE OF GAS EMISSION BY BIOELECTROCHEMICAL APPROACHES FOR POWER-TO-X
… L-1 d-1) due to gas leakage, salt precipitation, sulphate-reducing bacteria competition, and CO2 dosing inefficiencies, the systems achieved a Coulombic efficiency of 45 ± 13%. The results confirmed the suitability of terracotta as a porous material capable of maintaining an anoxic environment for …
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Mechanisms for accumulation and migration of technetium-99 in saltmarsh sediments
… thermodynamic data. Data collected from reducing sediments imply that similar mechanisms are responsible for the accumulation of Mn (e.g. reduction by sulphate reducing bacteria) and the accumulation of Tc. <br/>The inventory of <sup>99</sup>Tc held within the Thornflatt saltmarsh is …
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Liberation of low molecular weight organic acids from sedimentary organic matter and their role on microbial activity
… The main electron donor in TMVs in Azerbaijan is sulphate, and microbial sulphate reduction leads to the production of a wide range of reduced sulphur species that are key players in several biological processes. In our study we estimated the effect of LMWOAs on the sulphur metabolising activity …
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An integrated approach of determining shale gas potentiality of carbonaceous shale of the Permian Tuli Basin, Limpopo Province of South Africa
… barite in the black shale by the action of sulphate-reducing bacteria while Zn indicates paleo-productivity of abundant organic matter. Furthermore, Mo concentration > 2.5ppm of Mikambeni, suggests a marine sediment input in the Mikambeni samples apart from terrigenous sources in all studied …
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Optimisation of a linear flow channel reactor for semi-passive, simultaneous biological sulphate reduction and partial sulphide oxidation
… activities and typically has high levels of sulphate and heavy metals, at acidic pH. Similarly, high sulphate neutral rock drainage is of increasing concern. High sulphate content increases water salinity leading to adverse effects on human health as well as agriculture. Types of ARD and …
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Investigation of alternative carbon sources for the biological treatment of synthetic sulphate-laden water and mine impacted water in a linear flow channel reactor
… metal components of AMD but often fail to meet sulphate removal standards, necessitating additional polishing steps that add to expense. They also carry drawbacks such as high operational costs and metal sludge generation for active treatment and reduced process control and the need for large …
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A Comparative Analysis of the Performance and the Microbial Ecology of Biological Sulphate Reducing Reactor Systems
… defined as acidic waste-water contaminated with sulphate and heavy metals which is generated through the oxidation of sulphidic ores in the presence of water and oxygen. Mining activities accelerate this process by bringing these ores to the surface where they are further crushed and, eventually …
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A novel semi-passive process for sulphate removal and elemental sulphur recovery centred on a hybrid linear flow channel reactor
… These semi-passive systems typically target sulphate salinity through biological sulphate reduction catalysed by sulphate reducing bacteria (SRB). These anaerobic bacteria reduce sulphate, in the presence of a suitable electron donor, to sulphide and bicarbonate. However, the hydrogen …
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