arsenic stabilization zealand
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- arsenic stabilization zealand
1. Introduction. Arsenic-alkali residue (AAR) from antimony (Sb) smelting is a highly hazardous arsenic-bearing solid waste with a high content of available arsenic (As) (1–10%) (Guo et al., 2014, Zeng et al., 2011), which could generate severe threats to ecological environment and human health (Wang et al., 2013, Wen et al., 2018).The AAR …
به خواندن ادامه دهیدBecause of its high mobility and difficult capture, gaseous arsenic pollution control has become the focus of arsenic pollution control. It mainly exists in the form of highly toxic As 2 O 3 in the flue gas. Therefore, removing gaseous As 2 O 3 from flue gas is of great practical significance for arsenic pollution control. Stabilizing gaseous As 2 O 3 …
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Acidic arsenic-containing wastewater from copper smelting poses a potential threat to human and environmental safety due to its high toxicity, acidity, high volumes, and difficulty to be processed and utilized. This study proposed a technique to leach environmentally stable scorodite from wastewater using natural zinc slag as a solid iron …
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Stabilization of available arsenic in arsenic calcium residue (ACR) using a developed cost-effective composite Fe-based stabilizer. February 2022. Journal of …
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Arsenic sulfide slag (ASS) with high content of arsenic is a common industrial waste in nonferrous metal smelting. Because of the high potential of arsenic leaching under environmental conditions, it brings serious ecological threat during storage. Stabilization of the unstable arsenic in ASS is urgently needed for its safe disposal.
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Efficient stabilization of arsenic in the arsenic-bearing lime-ferrate sludge by zero valent iron-enhanced hydrothermal treatment. Chemical Engineering Journal …
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This study explored and analyzed the potential of the practical use of acid mine drainage-treated sludge (AMDS) as a new soil stabilizer for arsenic (As) and heavy metals. Various analyses, toxicity …
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Arsenic is a grey-colored, natural element in the earth's crust, but its pure form is not common in the environment. It is usually found combined with other elements, mainly oxygen, sodium, chlorine, or sulfur. Some of these …
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The stabilization efficiencies of arsenic (As) in contaminated soil were evaluated using various additives such as limestone, steel mill slag, granular ferric hydroxide (GFH), and mine sludge collected from an acid mine drainage treatment system. The soil samples were collected from the Chungyang area, where abandoned Au–Ag mines are …
به خواندن ادامه دهیدArsenic 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 …
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of arsenic-contaminated adsorbent and arsenic waste was also a big problem because of the toxic and leaching effect of arsenic. So, arsenic waste was disposed of by proper stabilization/ solidification (S/S) technique by mixing it in Portland cement, iron, ash, etc. to reduce the leaching effect. Keywords Adsorption .Arsenic .Adsorbents ...
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Minimization and stabilization of arsenic-containing smelting wastewater and residue is of crucial issue to resolve the arsenic contamination. Calcium arsenate is a typical precipitate produced from disposal of smelting acid wastewater. However, it suffers from poor stability and large quantity in the aqueous environment. Copper slags, as for …
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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 …
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A lot of anthropogenic activities can discharge arsenic into the ecosystem such as industrial wastes, incineration of municipal, pesticide production and wood preserving. In addition, most arsenic soluble species can enter surface waters via runoff and leach into the groundwater. Around forty million people from all over the world are …
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Arsenic-alkali mixed salt (AAS) is a hazardous by-product of the treatment of arsenic-alkali residue (AAR). Although direct carbothermal reduction can enable the harmless and resourceful disposal of AAS, the specific reaction pathway and mechanism of the reduction process remain unclear.
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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 …
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Technologies for water include: precipitation-coprecipitation, membrane filtration, adsorption, ion exchange, permeable reactive barriers, and biological treatment. Two technologies discussed in the report address soils, other solids, and water: electrokinetics and phytoremediation. Arsenic Treatment Technologies for Soil, …
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The results demonstrated that arsenic stabilization was positively correlated with the dosage, nZVI loading ratio, and remediation time. 5% nZVI@BC (3:1) exhibited the best immobilization performance, significantly promoted the transformation from labile arsenic to iron-aluminum oxide binding state and residue state, and improved …
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The amount of soluble arsenic has been found to be lower in the presence of calcium when treated with ferric oxides. Lime (calcium oxide, CaO) has been used to stabilize arsenic contaminated wastes, residuals, and soils [5], [6], [9]. Kim et al. [5] studied the stabilization of arsenic in mine tailings using calcium.
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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.
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Ferrihydrite (Fh) is a poorly crystalline Fe(III)-oxyhydroxide found in abundance in soils and sediments. With a high specific surface area and sorption capacity at circumneutral pH, ferrihydrite is an important player in the biogeochemical cycling of nutrients and trace elements in redox-dynamic environments. Under reducing conditions, …
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Arsenic is a highly toxic element. Its toxicity to human health includes cancer of the skin, brain, lung, kidney, and stomach (Smith et al. 1992; Wang et al. 2011; Wu et al. 2016).China owns 70% of the world's arsenic resources and is also the largest producer of arsenic with more than 40,000 tons of annual emissions (Xiao et al. 2008; Zhang et al. …
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Arsenic stabilization performance of a novel starch-modified Fe-Mn binary oxide colloid Sci. Total Environ., 707 ( 2020 ), Article 136064, 10.1016/j.scitotenv.2019.136064 View PDF View article View in Scopus Google Scholar
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The proposed method of arsenic stabilization together with the other toxic elements present is based on progressive reduction of their solubility by a series of precipitation and solidification agents. The key factor of successful arsenic fixation is embedding of calcium and ferric arsenates/arsenites in the cement matrix. It is possible to ...
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1. Introduction. China has been the main arsenic (As) and antimony (Sb) provider in the world, accounting for over 68% and 87% of the global As and Sb …
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Jarosite is one of the principal precipitates from process waters of the pressure-oxidation autoclave system at the Macraes gold mine, and this jarosite is discharged with the process waters to a tailings impoundment for long-term storage. Dissolved sulfate and arsenate concentrations in the autoclave, inferred from mineralogy, …
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Based on stabilization/solidification blast furnace slag-based cementitious materials (BCMs), this study innovatively proposes to improve the arsenic (As) solidification …
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The types of As species and minerals in realgar tailings, which are unlike those in As-bearing metal mine tailings, may affect the transformation pathways of As during stabilization by Fe salts. Arsenic in metal mine tailings is generally concomitant with Fe in the form of arsenopyrite (FeAsS) and As-bearing pyrite (As–FeS 2), and their ...
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