Factorial design and response surface analyses to understand the Effect of Process Variables on the Sulfate Reduction Process in the IFB Reactor

2022 ◽  
pp. 147-167
Author(s):  
Denys Kristalia Villa Gómez
Keyword(s):  
Factorial Design ◽  
Sulfate Reduction ◽  
Response Surface ◽  
Reduction Process ◽  
Process Variables ◽  
Sulfate Reduction Process

Precipitation of heavy metals from coal ash leachate using biogenic hydrogen sulfide generated from FGD gypsum

2013 ◽  
Vol 67 (2) ◽  
pp. 311-318 ◽  
Author(s):  
Madawala Liyanage Duminda Jayaranjan ◽  
Ajit P. Annachhatre
Keyword(s):  
Heavy Metals ◽  
Hydrogen Sulfide ◽  
Sulfate Reduction ◽  
Bottom Ash ◽  
Coal Ash ◽  
Reduction Process ◽  
Fgd Gypsum ◽  
Sulfate Reducing ◽  
Sulfate Reduction Process ◽  
Biological Sulfate Reduction

Investigations were undertaken to utilize flue gas desulfurization (FGD) gypsum for the treatment of leachate from the coal ash (CA) dump sites. Bench-scale investigations consisted of three main steps namely hydrogen sulfide (H2S) production by sulfate reducing bacteria (SRB) using sulfate from solubilized FGD gypsum as the electron acceptor, followed by leaching of heavy metals (HMs) from coal bottom ash (CBA) and subsequent precipitation of HMs using biologically produced sulfide. Leaching tests of CBA carried out at acidic pH revealed the existence of several HMs such as Cd, Cr, Hg, Pb, Mn, Cu, Ni and Zn. Molasses was used as the electron donor for the biological sulfate reduction (BSR) process which produced sulfide rich effluent with concentration up to 150 mg/L. Sulfide rich effluent from the sulfate reduction process was used to precipitate HMs as metal sulfides from CBA leachate. HM removal in the range from 40 to 100% was obtained through sulfide precipitation.

Inhibition of anaerobic biological sulfate reduction process by copper precipitates

Chemosphere ◽  
2019 ◽  
Vol 236 ◽  
pp. 124246 ◽  
Author(s):  
Shahrokh Shahsavari ◽  
Rajesh Seth ◽  
Subba Rao Chaganti ◽  
Nihar Biswas
Keyword(s):  
Sulfate Reduction ◽  
Reduction Process ◽  
Sulfate Reduction Process ◽  
Biological Sulfate Reduction

Application of Sulfate Reduction for the Biological Conversion of Anglesite to Galena

2007 ◽  
Vol 20-21 ◽  
pp. 197-200 ◽  
Author(s):  
Anke Wolthoorn ◽  
Simon Kuitert ◽  
Henk Dijkman ◽  
Jacco L. Huisman
Keyword(s):  
Sulfate Reduction ◽  
Large Scale ◽  
Reduction Process ◽  
Electrochemical Process ◽  
Precipitation Process ◽  
Flotation Process ◽  
Bench Scale ◽  
Sulfate Reduction Process ◽  
Biological Sulfate Reduction ◽  
Ph Decrease

In a bench scale trial biological sulfate reduction was applied to convert anglesite (PbSO4) to galena (PbS). Anglesite is a main constituent of waste fractions such as the residue from an indirect leaching process or in lead paste from spent car batteries. The goal of this study was to develop a technology to decrease the lead (Pb) emissions by converting PbSO4 from a waste fraction into PbS, which can be recovered from the waste fraction using a flotation process or an electrochemical process. The conversion of anglesite to galena is based on the biological sulfate reduction process and a metal precipitation process. First sulfate is biologically reduced to sulfide. Secondly, the Pb2+ from the PbSO4 reacts chemically with the sulfide resulting from the first reaction. A bench-scale reactor was started up using sulfate- and sulfur-containing influent. The reactor was seeded with biocatalyst from several full-scale reactors. Anglesite-containing residue was added batch-wise when the formation of sulfide started. The residue contained mainly PbSO4 (51.7%), sulfate (SO4 2-, 19.9%) and elemental sulfur (S0, 15.1%). Galena precipitates in the bioreactor due to the near-neutral pH at which sulfate reduction is carried out. During the experiment a surplus of sulfide relative to Pb was maintained to prevent the formation of PbCO3 and the accompanying pH decrease that would unavoidable result in the inhibition of the biocatalyst. Both sulfate and sulfur present in the residue were biologically reduced. The formation of PbS was confirmed by the increased Pb:O ratio of the sludge (1:0.03) relative to the Pb:O ratio of the residue (1:0.3). A potential large-scale application is proposed.

scholarly journals Effects of CdS NPs on Sulfate Bioreduction and Oxidative Stress to Desulfovibrio Desulfuricans

2021 ◽  
Author(s):  
Guoqing Cheng ◽  
Huili Ding ◽  
Guanglin Chen ◽  
Hongjie Shi ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Sulfate Reduction ◽  
Reduction Process ◽  
Desulfovibrio Desulfuricans ◽  
Extracellular Electron Transfer ◽  
Sulfate Reducing ◽  
Reduction Efficiency ◽  
Sulfate Reduction Process ◽  
Photosynthetic Microorganisms ◽  
Reducing Bacteria

Abstract Sulfate-containing wastewater has a serious threat to the environment and human health. Microbial technology has great potential for the treatment of sulfate-containing wastewater. It was found that nano-photocatalysts could be used as extracellular electron donors to promote the growth and metabolic activity of non-photosynthetic microorganisms. However, nano-photocatalysts could also induce oxidative stress and damage cells. In this paper, the mechanism and regulation strategy of cadmium sulfide nanoparticles（CdS NPs）on the growth of sulfate reducing bacteria and the sulfate reduction process were investigated. The results shows that the sulfate reduction efficiency could be increased by 6.43% through CdS NPs under light conditions. However, the growth of C09 was seriously inhibited by 55.00% due to the oxidative stress induced by CdS NPs on cells. The biomass and sulfate reduction efficiency could be enhanced by 6.84% and 5.85%, respectively, through external addition of humic acid (HA). At the same time, the mechanism of the CdS NPs strengthening the sulfate reduction process by sulfate bacteria was also studied. Which can provide important theoretical guidance and technical support for the development of microbial technology combined with extracellular electron transfer (EET) for the treatment of sulfate-containing wastewater.

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