A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

Du, Yunchen; Lü, Qianqian; Chen, Huiyun; Du, Yunhui; Du, Dongyun

doi:10.1016/j.jwpe.2016.06.003

Cited by 38 publications

(10 citation statements)

References 25 publications

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“…The surface of these forms is smooth, representing a typical crystalline form of gypsum (CaSO4). Similar results were reported by Du et al (2016). The resulting residue was compact, indicating that the material formed was crystalline.…”

Section: Geochemical Modelingsupporting

confidence: 87%

Assessment of the Combined Use of Basic Oxygen Furnace Sludge and Hydrogen Peroxide in the Treatment of Acid Mine Drainage

et al. 2021

Preprint

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We recently demonstrated the use of basic oxygen furnace sludge (BOFS) to remove arsenic and sulfate from acidic solutions, which was found to be an interesting alternative for the reuse of steel waste. In this study, four systems were evaluated to determine whether BOFS is stable in acidic solutions and capable of removing As, Mn, and sulfate from acid mine drainage (AMD). In the S1 system (BOFS/DEIONIZED WATER pH 2.5), the stability of the residue was evaluated by placing the BOFS in deionized water acidified with H2SO4 until the pH reached 2.5. This system was maintained for 408 h under agitation to evaluate the possible solubilization of metals present in the BOFS. The results showed that only Ca and Mg were solubilized, and the pH increased from 2.5 to 12 after 408 h. The S3 system (BOFS/AMD) evaluated the metal removal capacity by BOFS and achieved 100% removal of As and Mn and 70% removal of sulfate after 648 h. In the first 30 min, the pH increased from 2.5 to 9.0, which was maintained until the end of the experiment. Simultaneously, S4 and S5 systems (BOFS/AMD / H2O2) were also evaluated using the oxidizing agent H2O2 (29% w/w) in the following proportions: 0.5 mM in S4 and 1 mM in S5. The removal of As, Mn, and sulfate in these systems was similar to that in the S3 system, which contained only BOFS. The results demonstrated that the formation of iron oxides was not accelerated by H2O2 and that iron, which is present in high concentrations in BOFS, was not the primary agent influencing metal removal from AMD.

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Section: Geochemical Modelingsupporting

confidence: 87%

Assessment of the Combined Use of Basic Oxygen Furnace Sludge and Hydrogen Peroxide in the Treatment of Acid Mine Drainage

et al. 2021

Preprint

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“…The arsenic concentrations for the waste acid usually range from 0.5 to 30 g L À1 with sulfuric acid concentrations ranged from 10 to 200 g L À1 , which is the most crucial arsenic waste because of its high arsenic mobility and toxicity. [3][4][5] Even a slight leakage of higharsenic waste acid will cause serious arsenic pollution as well as widely safety and environmental concern. 6,7 Neutralization and sulfurization processes are typical processes to treat the high-arsenic waste acid.…”

Section: Introductionmentioning

confidence: 99%

“…6,7 Neutralization and sulfurization processes are typical processes to treat the high-arsenic waste acid. 1,3 In neutralization process, arsenic in the waste acid is transformed into solid hazardous waste composed of calcium arsenate/arsenite, gypsum and other compounds by using Ca-containing compounds (CaO, Ca(OH) 2 and CaCO 3 ) as precipitators. 8 When suldes (Na 2 S and H 2 S) are used to precipitate the arsenic to produce arsenic sulde, a large quantity of hazardous arsenic sulde sludge will be discharged.…”

Section: Introductionmentioning

confidence: 99%

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

Wei

et al. 2020

RSC Adv.

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“…Sulfide precipitation produces smaller sludge volumes in comparison with hydroxide precipitation [19][20][21]. Calcium carbonate and ferric sulfate are alternatives to classical precipitants [22]. The main disadvantages of the chemical precipitation process are the fine particles of precipitates which hamper the filtration and the removal of the precipitates.…”

Section: Weak Acid Treatmentmentioning

confidence: 99%

Leaching of Oxide Copper Ores by Addition of Weak Acid from Copper Smelters

Araya

Toro

Castillo

et al. 2020

Metals

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In this study, weak acid in the curing and leaching stages of copper ore was incorporated, and we analyzed its effect on the dissolution of copper and final impurities. The weak acid corresponds to a wastewater effluent from sulfuric acid plants produced in the gas treatment of copper smelting processes. This effluent is basically water with high acidity (pH-value low at 1), which contains several toxic elements and some valuable metals. The results indicated that there is no positive or negative effect on the incorporation of the weak acid in the curing stage, while the case of the leaching stage is favored. Toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) toxicity tests were performed on the solid leaching residues, determining that they accomplish the stability ranges of the impurities (Pb, Cd, Hg, Cr, Ba, Se, As, and Ag).

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A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

Cited by 38 publications

References 25 publications

Assessment of the Combined Use of Basic Oxygen Furnace Sludge and Hydrogen Peroxide in the Treatment of Acid Mine Drainage

Assessment of the Combined Use of Basic Oxygen Furnace Sludge and Hydrogen Peroxide in the Treatment of Acid Mine Drainage

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

Leaching of Oxide Copper Ores by Addition of Weak Acid from Copper Smelters

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