A Study on the Rule of Arsenic Precipitation by H 2 S in High Concentrations of H 2 SO 4

Ying Zhu, Xingguang Hao, Xin Sun, Fei Wang, Kai Li, Ping Ning () and Lei Shi ()
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Ying Zhu: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Xingguang Hao: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Xin Sun: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Fei Wang: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Kai Li: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Ping Ning: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Lei Shi: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China

Sustainability, 2025, vol. 17, issue 6, 1-19

Abstract: Herein, targeting arsenic-containing acidic wastewater generated from washing arsenic-containing flue gas with concentrated sulfuric acid, the arsenic removal efficiency using H 2 S was investigated. The effects of H 2 S concentration, the gas flow rate, H 2 SO 4 concentration, temperature, and Cl − /F − ions on arsenic removal were studied. Results indicate that H 2 S concentration is the primary factor. Arsenic was precipitated as amorphous As 2 S 3 , reducing residual arsenic to 0.28 mg/L. Cl − enhanced arsenic removal, yielding a residual concentration of 0.68 mg/L, while F − exhibited a dual effect: the inhibition at low concentrations and promotion at high concentrations. At 100 g/L F − , the residual arsenic was 29.59 mg/L. These effects are attributed to Cl − /F − altering the surface electrochemical properties of As 2 S 3 particles. Additionally, both ions improved As 2 S 3 hydrophobicity. This study provides insights for purifying arsenic-containing sulfuric acid.

Keywords: As removal; sulfuric acid; H 2 S; Cl anion; F anion (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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