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Microbial removal of heavy metals in mine tailings from a Cu–Ag mine in the Philippines wasinvestigated. Effect of bacterial strains on bioleaching and fractionation of heavy metals were alsostudied. Single and mixed cultures of Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans wereused separately to compare efficiency of metal solubilization. The results showed that mixed cultureswere more efficient than each bacterium for Cu and As, while A. ferrooxidans demonstrated fasterextraction efficiency for Mn and Zn. The results of sequential extraction for residues indicated that purebacteria and mixed cultures mediated occurrence mode of heavy metals in different ways.
The catalytic effect of activated charcoal on the microbialextraction of As and heavy metals from mine tailings collectedfrom a floatation plant in the Philippines was investigated using amixed culture of Acidithiobacillus ferrooxidans and A. thiooxidans. The addition of activated charcoal enhanced the extraction of Cu,Zn and As significantly. The optimal concentration of activatedcharcoal for enhancing Cu, Zn and As extraction was found to be4 g/L, 1 g/L, and 2 g/L, respectively. However, the presence of activatedcharcoal was observed to depress the dissolution of Mn andFe. The highest extraction efficiencies for Mn, Cu, Zn, As, and Fewere 98%, 86%, 84%, 83%, and 46%, respectively. The resultsindicated that the addition of activated charcoal to conventionalbioleaching technique may provide more effective and less costlymethod for extraction of heavy metals from mine tailings.
Two highly tellurite-resistant bacteria were isolated from wastewater. Both bacteria could performtellurite reduction under an initial pH of 5–9, temperature of 20–37 C, and salinity conditions lower than5%. The maximum reduction rate of strain WYA (Vmax = 20.45 mMh 1) was much higher than that of strainWYS (Vmax = 11.49 mMh 1). Both bacteria produced tellurium nanorods that were accumulatedintracellularly or extracellularly. Strain WYA is a new strain belonging to the Raoultella genus, whereasstrain WYS belongs to the Escherichia genus. This study indicated that both these bacteria are potentialmicroorganisms for green synthesis of tellurium nanorods, which have a wide application inenvironmental remediation and the nanotechnology industry.
Hereditary angioedema (HAE) is rare disorder due to C1-inhibitor deficiency (C1-INH) that are debilitating and may be life-threatening. HAE is a lack of consensus concerning diagnosis, therapy, and management, particularly in Vietnam. In this case report, we report a 40-year-old male patient with typical clinical symptoms and family history but he showed normal C4 level, and we could not measure C1q and C1-INH level. However, the diagnosis of HAE can be made based on typical clinical symptoms and the favorable prophylactic response to danazol treatment. Based on these findings,we suggest that he has type I HAE, although he showed normal C4 level.
<P><B>Abstract</B></P> <P>This study aims to enrich Sb(V)-reducing bacterial communities from Sb-contaminated soils using various electron donors for bioremediation of Sb-contaminated sites and recovery of Sb from wastewater. When the organic electron donors were used, Sb(V) reduction rates were 2–24 times faster but electron recoveries were 24–59% lower compared to the culture using inorganic electron donor. The morphological crystallizations of the antimony-reduced precipitates were completely different depending on the electron donor. Different microbial populations were enriched with various electron donors but most commonly, only <I>Proteobacteria</I> and <I>Firmicutes</I> phyla were enriched from a diversified soil microbial community. <I>Geobacter</I> sp. seemed to be an important bacterium in organic electron donors-fed cultures whereas an unclassified <I>Rhodocyclaceae</I> was dominant in inorganic electron donor-fed cultures. The results indicated that organic electron donors especially sugar groups were preferable options to obtain rapid Sb(V)-reduction whereas inorganic electron donor like H<SUB>2</SUB> was better option to achieve high electron recovery.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sb(V)-reduction with organic electron donor was faster than with inorganic ones. </LI> <LI> Electron recovery for organic electron donor was lower than for inorganic ones. </LI> <LI> Microcrystals formed in cultures were different depending on the electron donor. </LI> <LI> Sb(V)-reducing bacterial communities were different depending on the electron donor. </LI> </UL> </P>
<P><B>Abstract</B></P> <P>Iron contamination in groundwater has attracted much attention from environmentalists and government agencies because it can cause many problems in human life and in industrial and agricultural activities when groundwater is directly used without any treatment. This study aims to investigate the electrochemical oxidation of Fe(II) to Fe(III) and recovery of insoluble Fe(III) using non-corrosive graphite electrode which serves as a controllable, low-cost, low maintenance and virtually unlimited electron acceptor for Fe(II) oxidation. The lab-scale results indicated that Fe(II) removal up to 100% was obtained at an applied voltage higher than 2 V. The Fe(II) removal efficiency was linearly increased with the increase of potential supply in the range of 1–4 V in the salinity 0.5%. The Fe(II) removal rate could no longer be enhanced at the applied potential higher than 8 V in the condition without salinity. The results from SEM-EDS and XRD revealed that Fe was recovered as FeOOH by conventional filtration with a recovery efficiency of 82.7–92.1%. The electrochemical Fe(II) removal might be an alternative for the conventional method of the in situ Fe removal from groundwater. Besides, the recovered FeOOH can be used as a raw material for environmental remediation and pigment industry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe(II) could be removed by electrochemical oxidation with non-corrosive electrodes. </LI> <LI> Fe(II) removal up to 100% was obtained with voltage applied higher than 2 V. </LI> <LI> Fe was recovered as FeOOH with recovery efficiency of 82.7–92.1%. </LI> <LI> Fe removal and recovery could be significantly enhanced by salinity addition. </LI> </UL> </P>
<P><B>Abstract</B></P> <P>Microbial removal of heavy metals in mine tailings from a Cu–Ag mine in the Philippines was investigated. Effect of bacterial strains on bioleaching and fractionation of heavy metals were also studied. Single and mixed cultures of <I>Acidithiobacillus thiooxidans</I> and <I>Acidithiobacillus ferrooxidans</I> were used separately to compare efficiency of metal solubilization. The results showed that mixed cultures were more efficient than each bacterium for Cu and As, while <I>A. ferrooxidans</I> demonstrated faster extraction efficiency for Mn and Zn. The results of sequential extraction for residues indicated that pure bacteria and mixed cultures mediated occurrence mode of heavy metals in different ways.</P>