scholarly journals Dimethylmercury Degradation by Dissolved Sulfide and Mackinawite

2020 ◽  
Vol 54 (21) ◽  
pp. 13731-13738 ◽  
Author(s):  
Johannes West ◽  
Andrew M Graham ◽  
Van Liem-Nguyen ◽  
Sofi Jonsson
Keyword(s):  
Dissolved Sulfide

Use of ORP (oxidation-reduction potential) to control oxygen dosing for online sulfide oxidation in anaerobic treatment of high sulfate wastewater

2003 ◽  
Vol 47 (12) ◽  
pp. 183-189 ◽  
Author(s):  
S.K. Khanal ◽  
C. Shang ◽  
J.-C. Huang
Keyword(s):  
Reduction Potential ◽  
Sulfide Oxidation ◽  
Anaerobic Treatment ◽  
Oxygen Injection ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Controlling Parameter ◽  
Dissolved Sulfide ◽  
High Sulfate ◽  
Sulfide Control

In this study, oxidation-reduction potential (ORP) was used as a controlling parameter to regulate oxygen dosing to the recycled biogas for online sulfide oxidation in an upflow anaerobic filter (UAF) system. The UAF was operated with a constant influent COD of 18,000 mg/L, but with different influent sulfates of 1000, 3000 and 6000 mg/L. The reactor was initially operated under a natural ORP of -290 mV (without oxygen injection), and was then followed by oxygenation to raise its ORP by 25 mV above the natural level for each influent sulfate condition. At 6,000 mg/L sulfate without oxygen injection, the dissolved sulfide reached 733.8 mg S/L with a corresponding free sulfide of 250.3 mg S/L, thus showing a considerable inhibition to methanogens. Upon oxygenation to raise its ORP to -265 mV (i.e., a 25 mV increase), the dissolved sulfide was reduced by more than 98.5% with a concomitant 45.9% increase of the methane yield. Under lower influent sulfate levels of 1,000 and 3,000 mg/L, the levels of sulfides produced, even under the natural ORP, did not impose any noticeable toxicity to methanogens. Upon oxygenation to raise the ORP by +25 mV, the corresponding methane yields were actually reduced by 15.5% and 6.2%, respectively. However, such reductions were not due to the adverse impact of the elevated ORP; instead, they were due to a diversion of some organic carbon to support the facultative activities inside the reactor as a result of excessive oxygenation. In other words, to achieve satisfactory sulfide oxidation for the lower influent sulfate conditions, it was not necessary to raise the ORP by as much as +25 mV. The ORP increase actually needed depended on both the influent sulfate and also actual wastewater characteristics. This study had proved that the ORP controlled oxygenation was reliable for achieving consistent online sulfide control.

Comparing in situ colorimetric DET and DGT techniques with ex situ core slicing and centrifugation for measuring ferrous iron and dissolved sulfide in coastal sediment pore waters

Chemosphere ◽  
2017 ◽  
Vol 188 ◽  
pp. 119-129 ◽  
Author(s):  
Nadeeka Rathnayake Kankanamge ◽  
William W. Bennett ◽  
Peter R. Teasdale ◽  
Jianyin Huang ◽  
David T. Welsh
Keyword(s):  
Ferrous Iron ◽  
Coastal Sediment ◽  
Ex Situ ◽  
Pore Waters ◽  
Dissolved Sulfide

Impact of microaeration bioreactor on dissolved sulfide and methane removal from real UASB effluent for sewage treatment

2020 ◽  
Vol 81 (9) ◽  
pp. 1951-1960 ◽  
Author(s):  
C. S. Cabral ◽  
A. L. Sanson ◽  
R. J. C. F. Afonso ◽  
C. A. L. Chernicharo ◽  
J. C. Araújo
Keyword(s):  
Sewage Treatment ◽  
Oxygen Demand ◽  
Post Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Sulfide Removal ◽  
Dissolved Sulfide ◽  
Removal Efficiencies ◽  
Anaerobic Sludge Blanket

Abstract Two bioreactors were investigated as an alternative for the post-treatment of effluent from an upflow anaerobic sludge blanket (UASB) reactor treating domestic sewage, aiming at dissolved sulfide and methane removal. The bioreactors (R-control and R-air) were operated at different hydraulic retention times (HRT; 6 and 3 h) with or without aeration. Large sulfide and methane removal efficiencies were achieved by the microaerated reactor at HRT of 6 h. At this HRT, sulfide removal efficiencies were equal to 61% and 79%, and methane removal efficiencies were 31% and 55% for R-control and R-air, respectively. At an HRT of 3 h, sulfide removal efficiencies were 22% (R-control) and 33% (R-air) and methane removal did not occur. The complete oxidation of sulfide, with sulfate formation, prevailed in both phases and bioreactors. However, elemental sulfur formation was more predominant at an HRT of 6 h than at an HRT of 3 h. Taken together, the results show that post-treatment improved the anaerobic effluent quality in terms of chemical oxygen demand and solids removal. However, ammoniacal nitrogen was not removed due to either the low concentration of air provided or the absence of microorganisms involved in the nitrogen cycle.

Potential-pH Diagrams for Iron and Nickel in High Salinity Geothermal Brine Containing Low Concentrations of Hydrogen Sulfide

CORROSION ◽  
1979 ◽  
Vol 35 (10) ◽  
pp. 471-475 ◽  
Author(s):  
DIGBY D. MACDONALD ◽  
BARRY C. SYRETT
Keyword(s):  
Hydrogen Sulfide ◽  
High Temperature ◽  
High Salinity ◽  
Metal Sulfides ◽  
Geothermal Systems ◽  
Chloride Complexes ◽  
Geothermal Brine ◽  
Low Concentrations ◽  
Sulfide Content ◽  
Dissolved Sulfide

Abstract Potential-pH diagrams are reported for iron and nickel in sulfide containing high salinity geothermal brine at 25 and 250 C. Metal sulfides, as well as dissolved chloride complexes, were considered in deriving the diagrams, and the potential-pH relationships for those equilibria involving dissolved H2S or its anions are plotted for a constant total dissolved sulfide content of 10 ppm. The diagrams are used to analyze the general features of the thermodynamic behavior of iron and nickel in geothermal systems, and to identify processes that might be expected to occur in high temperature sulfide containing brines.

Dissolved sulfide-catalyzed precipitation of disordered dolomite: Implications for the formation mechanism of sedimentary dolomite

2012 ◽  
Vol 97 ◽  
pp. 148-165 ◽  
Author(s):  
Fangfu Zhang ◽  
Huifang Xu ◽  
Hiromi Konishi ◽  
Joshua M. Kemp ◽  
Eric E. Roden ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Dissolved Sulfide
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