Dundee Sustainable Technologies' CLEVR process is a cleaner, efficient and cost-effective alternative to cyanide for the extraction of gold, while its GLASSLOCK process removes and stabilizes arsenic associated with precious and base metal deposits. A Canadian-based subsidiary of Dundee Corporation, DST has offices, a technical center, …

Due to the high-acidic arsenic-containing wastewater pollution greatly threatening human health and ecological safety, a simple and efficient method for reducing arsenic was proposed in this paper to solve this problem. By using potassium borohydride (KBH4) as a reducing agent, the soluble arsenic was converted into the gaseous arsine …

Arsenic is a toxic metalloid which is widely distributed in nature. It is normally present as arsenate under oxic conditions while arsenite is predominant under reducing condition. The major discharges of arsenic in the environment are mainly due to natural sources such as aquifers and anthropogenic sources. It is known that arsenite salts are …

Arsenic calcium residue (ACR) generated from the As-bearing wastewater treatment is highly hazardous due to high content of available As, which was seeking a suitable method for safe disposal such as stabilization treatment. In this study, the stabilization of available As in ACR was performed by combined treatment with FeSO 4 …

Column experiments were designed and conducted to study the transport of starch- and starch-xanthan gum modified Fe-Mn binary oxide particles (SFM and SXFM) in saturated heterogeneous porous media and to reveal the particles' arsenic (As) stabilization performance.

In this work, firstly, the mechanisms influencing the scorodite crystal characteristics for arsenic stabilization were investigated, and the results indicated that the scorodite stability was greatly influenced by the scorodite crystal shape and particle size. ... New Zealand. Appl. Geochem. 2008; 23:467–1483. doi: 10.1016/j.apgeochem.2007.12 ...

PDF | On Nov 5, 2014, Claes Bergqvist and others published Phytostabilization of arsenic | Find, read and cite all the research you need on ResearchGate

Arsenic is a kind of element widely distributed in the environment that may pose a threat to the ecological environment and human health, while effective remediation and sustainable utilization of arsenic-containing …

After stabilization, the concentration of arsenic in the leach liquor decreased from 213 mg/L to 3.86 mg/L. However, a few problems remain with these methods: (i) a large amount of arsenic-containing solid waste is produced, (ii) industrial applications cannot be performed and (iii) metals cannot be recovered.

Two ferromanganese oxide–biochar composites (FMBC1 and FMBC2) were prepared by an impregnation method to promote the adsorption of As on red soil. Maximum adsorption capacities (Qm) of 0.687 and 0.712 mg g−1 were observed for FMBC1 and FMBC2, respectively, corresponding to increases of 104 and 111% relative to the control …

It can be attributed to the low active site density on the reduced iron powder because of the passive layer on its surface [40], which further demonstrated the important role of MC treatment in Fe powder activation and arsenic stabilization. The stabilization mechanism for arsenic during the MC treatment was studied in the following section. 3.3.

Feature papers represent the most advanced research with significant potential for high impact in the field. A Feature Paper should be a substantial original Article that involves several techniques or …

Stabilization and encapsulation strategies of arsenic- or antimony-bearing mine waste Stabilizing and encapsulating …

As can be volatilized naturally; however, this has adverse environmental effects. In this study, we investigated As volatilization in flooded paddy soil with the addition of biochar (BC) and Fe–Mn–La-modified BC composites (FMLBCs). The addition of BC and FMLBCs caused decreases in total As volatilization in the soil over 7 weeks. Maximum …

1. Introduction. Arsenic is a highly toxic metalloid [1], which is usually found associated with base metal and non-ferrous metal ores.As such, mining and smelting of non-ferrous metals are often major sources of anthropogenic arsenic contamination [2], [3], [4].A large amount of hazardous arsenic-containing waste acid generated from nonferrous …

The high-pressure phase transition behaviors and pressure-dependent compressibility are investigated on K 2 X(CO 3) 2 using first-principles calculation from ambient pressure to 30 GPa. The reversible structural phase transitions of K 2 X(CO 3) 2 are determined based on enthalpy difference and cell volume collapses. The pressure …

Arsenic contamination of soil, sediment and groundwater is a widespread problem in certain areas and has caused great public concern due to increased awareness of the health risks. Often the contamination is naturally occurring, but it can also be a result of waste generated from industrial processes. EPA's lowering of the drinking water …

Multiple dosages of coagulants improved the degree of arsenic removal to 98%. The full-scale treatment system, including the addition of hydrated lime and ferric chloride, clarification, filtration and carbon adsorption, achieved arsenic removal rates of 97% to 98%. A total of 650,600 l of wastewater was treated.

One commonly employed technique is stabilization and solidification, which involves the addition of stabilizing binders such as cement to immobilize arsenic. This study investigates the potential of alkaline activated slag for stabilization and solidification of arsenic-contaminated soil, employing the toxic characteristic leaching procedure ...

Abstract. Arsenic-rich non-ferrous smelter wastewater has the potential to cause harm to the environment and human health. The use of mineralizer modified and tailored scorodite crystals, a secondary As-bearing mineral, is considered to be the most promising strategy for arsenic stabilization.

Fei Y, Yan XL, Liao XY et al (2015) Effects of iron-based oxides on arsenic stabilization in soils of different water contents. Acta Sci Circumst 35(10):3252–3260. (In Chinese) CAS Google Scholar Fei Y, Yan X L, Liao X Y, et al. 2016. Stabilization effects and mechanisms of Fe-Mn binary oxide on arsenic and heavy metal co-contaminated Soils.

1. Introduction. Arsenic is one of the toxic metalloids that exists in more than 200 different mineral forms, where 60% of them are normally arsenates; 20% are sulphosalts and sulphides; and the remaining 20% are arsenite, oxides, arsenide, silicates, and elemental arsenic [1, 2].The intrusion of orogenesis and granitic magma have …

Arsenic stabilization through the formation of iron–arsenic minerals such as scorodite has led to commercial plants such as that installed by Ecometales in Chile and DOWA in Japan (Fujita et al., 2012). ... In some countries of Latin America, United States and New Zealand, the major source of As is hydrothermal activity like volcanic ...

Also, using 1% and 5% magnetite nanoparticles for arsenic immobilization in soil, it was shown that these nanoparticles could reduce the amount of arsenic by 42.5% and 92.3% in the TCLP test, respectively [20]. Yan et al. [21] used a starch-modified Fe-Mn oxide with an average particle size of 228 nm to remediate arsenic-contaminated soil.

Arsenic (As) is one of the most abundant naturally occurring elements in the earth's crust and considered a human carcinogen (Stea et al. 2014; Chakraborti et al. 2016; Rahman et al. 2017).Environmental contamination of As due to anthropogenic and geogenic sources has been widely reported in soil/sediment and water around the world (Fendorf …

A new method was developed for the coagulation of arsenic with serpentine and Fe(II).Excellent removal efficiency (>99%) and satisfactory stability of the sediments were accomplished for As(V) and As(III).A mechanism study showed that hydroxyls generated by the surface hydrolysis of serpentine mediated active iron hydroxides for …

Chemical stabilization and physical adsorption are the generally used methods for the disposal of As-contaminated water. Physical adsorption is usually used for the treatment of low-concentration arsenic wastewater (10 mg/L∼2 g/L) such as washing water of crushed waste concrete (Sasaki et al., 2014, Altundoğan et al., 2000).

Arsenic is toxic to animals, including humans and is also a carcinogen (cancer-causing agent), and causes both skin and lung cancers. Arsenic is of most concern when it is in …

Column experiments were designed and conducted to study the transport of starch- and starch-xanthan gum modified Fe-Mn binary oxide particles (SFM and SXFM) in saturated heterogeneous porous media and to reveal the particles' arsenic (As) stabilization performance. Fine-in-Coarse (FIC) and Coarse-in-Fine (CIF) patterns of …

DOI: 10.1016/j.jes.2021.05.007. Arsenic (As) and antimony (Sb) are usually coexistent in mine wastes and pose a great threat to human health. The As immobilization by nano …