Sulfide precipitation of arsenic/heavy metals from strongly acidic wastewater by gaseous H2S via microporous aeration and characteristics of formed metal sulfide particles

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-03-11 DOI:10.1016/j.psep.2025.107007

Zhilin Xia , Chengcheng Zhu , Zhenling Shen , Mingmeng Liu , Zhaopeng Zhang , Ting Wang , Qian Guo , Xin Yang

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引用次数: 0

Abstract

H₂S gas was employed as a sulfide agent via microporous aeration to remove arsenic/heavy metals from strongly acidic wastewater. Increasing the H₂S flow rate enhanced the mass transfer efficiency of H₂S. The volumetric mass transfer coefficient (K_La) of H₂S increased from 1.58 × 10⁻⁶(s⁻¹) to 4.74 × 10⁻⁵(s⁻¹) as the H₂S flow rate increased from 6.0 to 15.0 mL/min in strongly acidic wastewater (0.408 M H⁺). Additionally, regulating the H₂S flow rate and the acidity of the wastewater could achieve stepwise removal of arsenic/heavy metals from strongly acidic wastewater. Moreover, the overall supersaturation levels(S_A) during sulfide precipitation of Cu(II), Cd(II), and As(III) were decreased as the flow rate of H₂S increased, reducing the nucleation rate of particles. The zeta potential of metal sulfide particles increased as the acidity of wastewater increased, which improved the self-aggregation of the metal sulfide particles. Furthermore, the particle size of metal sulfide particles produced via microporous aeration of H₂S was larger than the corresponding particles formed by H₂S through mm-level porous aeration. This study offers significant insights into the resource recovery treatment of strong acid wastewater containing heavy metals by H₂S while mitigating the formation of fine metal sulfide particles.

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.