Integrated acid leaching and biological sulfate reduction of phosphogypsum for REE recovery

2020 ◽  
Vol 155 ◽  
pp. 106408 ◽  
Author(s):  
Marja Salo ◽  
Oleg Knauf ◽  
Jarno Mäkinen ◽  
Xiaosheng Yang ◽  
Pertti Koukkari
Keyword(s):  
Sulfate Reduction ◽  
Acid Leaching ◽  
Biological Sulfate Reduction

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

Electron donors for biological sulfate reduction

2007 ◽  
Vol 25 (5) ◽  
pp. 452-463 ◽  
Author(s):  
Warounsak Liamleam ◽  
Ajit P. Annachhatre
Keyword(s):  
Sulfate Reduction ◽  
Electron Donors ◽  
Biological Sulfate Reduction

Removal of antimony (Sb(V)) from Sb mine drainage: Biological sulfate reduction and sulfide oxidation–precipitation

2013 ◽  
Vol 146 ◽  
pp. 799-802 ◽  
Author(s):  
Huawei Wang ◽  
Fulong Chen ◽  
Shuyong Mu ◽  
Daoyong Zhang ◽  
Xiangliang Pan ◽  
...  
Keyword(s):  
Sulfate Reduction ◽  
Mine Drainage ◽  
Sulfide Oxidation ◽  
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.

Sign in / Sign up

Export Citation Format

Share Document