Results 211 to 220 of about 706,567 (260)

Sulfate Reduction in Marine Sediments

2000
The present chapter deals with the biogeochemical transformations of sulfur within marine sediments during early diagenesis. The term ‘early diagenesis’ refers to the whole range of postdepositional processes that take place in aquatic sediments coupled either directly or indirectly to the degradation of organic matter.
Kasten, S., Jørgensen, B.
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Reduction of Recycled Barium Sulfate

Russian Journal of Applied Chemistry, 2002
Barium sulfate, which is recycled according to a new flowsheet of sodium sulfide production, was reduced by various carbon-containing materials (oil and furnace coke and Zh-grade coal). The reduction process was studied in comparison with the reduction of natural barite concentrate.
L. A. Malysh, L. G. Gaisin, M. F. Volkova, A. G. Prokhorov, K. V. Tkachev   +4 more
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Thermochemical sulfate reduction a review

Journal of Thermal Analysis, 1994
The high concentrations of hydrogen sulfide found in many oil and gas fields is thought to arise from the oxidation of petroleum hydrocarbons by sulfate—a reaction that reduces the value of the resource. This review, undertaken in order to better understand the geochemistry of TSR reaction in oil field sediments, covers the relevant information on ...
T. P. Goldstein, Z. Aizenshtat
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Thermochemical Sulfate Reduction

1997
Abstract This paper will explore the significance of thermochemical sulfate reduction (TSR) to the origin of sediment-hosted disseminated gold (SHDG) deposits. TSR provides a means of generating abnormally high concentrations of H2S at moderate temperatures (e.g., 100 to 200°C).
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Sulfate reduction in deep-sea sediments

American Journal of Science, 1991
Sulfate reduction rates calculated from about 200 DSDP pore water sulfate profiles have been contoured and plotted on a map covering most areas of the world ocean. Rates show a remarkable spatial consistency, with high rates observed near the continental margins, becoming progressively lower toward the central ocean basins.
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Respiratory Sulfate Reduction

1995
In the microbial world the dissimilatory sulfate-reducing bacteria (SRB) are unique in that they have the ability to utilize inorganic sulfate as a terminal electron acceptor. This respiratory process, occurring under anaerobic conditions, is conducted by SRB for the purpose of generating high energy compounds for biosynthetic reactions involved in ...
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Reduction of sulfates by hydrogen

Canadian Journal of Chemistry, 1976
The initial stage of reduction of anhydrous sulfates by H2 may lead to the formation of any of the following: (1) sulfates at lower valency, e.g., reduction of CuSO4, HgSO4, Fe2(SO4)3; (2) metals, e.g., Cu2SO4, Ag2SO4; (3) sulfides, e.g., NiSO4, CoSO4, CdSO4, CaSO4, SrSO4, BaSO4, and alkaline metal sulfates; (4) oxides, e.g., Al2(SO4)3, MgSO4, BeSO4; (
Fathi Habashi, Shaheer A. Mikhail, Kim Vo Van   +2 more
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Simulation of sulfate-dependent sulfate reduction using Monod kinetics

Mathematical Geology, 1987
A simple computer code is presented for simulating the dependence of sulfate reduction on sulfate concentration using Monod kinetics. Unlike previous models, the code provides a numerical initial value problem solution, rather than a two-point boundary value solution, for the Monod model using a search procedure to find the correct starting value for ...
Leonard Robert Gardner, Ian Lerche
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Lead removal through biological sulfate reduction process

Bioresource Technology, 2007
The feasibility of lead removal through biological sulfate reduction process with ethanol as electron donor was investigated. Sulfide-rich effluent from biological process was used to remove lead as lead sulfide precipitate. The experiments were divided into two stages; Stage I startup and operation of sulfidogenic process in a UASB reactor and Stage ...
Tran Thi, Hien Hoa, Warounsak, Liamleam, Ajit P, Annachhatre   +2 more
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Dissimilatory Sulfate Reduction, Energetic Aspects

1981
Several strict anaerobic prokaryotes are capable of using sulfate as electron acceptor for catabolic oxidation processes. In doing so sulfate is reduced to H2S (Fig. 1). Respiration with sulfate as acceptor is termed dissimilatory sulfate reduction, bacteria capable of sulfate respiration are classifled as sulfate-reducing bacteria.
R. K. Thauer, W. Badziong
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