Mine Water and the Environment

, Volume 36, Issue 2, pp 255–263 | Cite as

Removal of Dissolved Arsenic by Pyrite Ash Waste

Technical Article
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Abstract

Pyrite ash (PA), a waste produced during the roasting of pyrite ores to produce sulfuric acid, was studied as a potential adsorbent for removing arsenic (As) from groundwater. The collected pyrite ash waste samples contained >86 % iron (as Fe2O3). The results indicate that adsorption of As by PA was only slightly affected by initial pH at pH ≤ 9. Arsenate removal efficiency increased with the amount of adsorbent added over the range of 0.1–50 g/L. The As(V) removal increased with time, and 79 % removal was achieved within 1 h. Moreover, there was no significant change in As concentrations after 24 h. The adsorption process was best described by a second-order kinetic model. The adsorption of As(V) onto the PA was found to have followed the Langmuir isotherm. In batch studies, the maximum As(V) removal efficiency was 97 % at an adsorbent dose of 10 g/L, with an initial As(V) concentration of 300 µg/L. Thus, the PA was shown to be a suitable sorbent, reducing As from an initial level of 600 to <10 μg/L As(V), i.e., below the WHO limit for drinking water.

Keywords

Arsenate Adsorption Borated water Kinetics Isotherm 

Entfernung von gelöstem Arsen mit Pyrit-Asche

Zusammenfassung

Pyrit-Asche (PA), ein Abprodukt bei der Röstung pyritischer Erze für die Schwefelsäureherstellung, wurde als potenzielles Adsorptionsmittel für die Entfernung von Arsen (As) aus Grundwasser untersucht. Die Proben der PA enthielten >86% Fe2O3. Die Ergebnisse zeigen für pH≤9, dass die Adsorption von As an PA nur wenig vom anfänglichen pH beeinflusst wird. Die Entfernung von Arsenat stieg mit der eingesetzten Adsorptionsmittelmenge im Bereich 0,1-50 g/L. Die Entfernung von As(V) wuchs mit der Zeit und 79% wurden innerhalb einer Stunde erreicht. Danach gab es keine signifikante Änderung der As-Konzentration innerhalb von 24 Stunden. Die Adsorption konnte am besten mit einer Kinetik zweiter Ordnung beschrieben werden. Die Adsorption von As(V) an PA folgte der Langmuir-Isotherme. In Batch-Versuchen mit ursprünglich 300 µg/L As(V) wurden maximal 97% As(V) entfernt bei einem Einsatz von 10 g/L PA. Damit wurde gezeigt, dass PA ein geeignetes Adsorptionsmittel ist, das die As(V)-Konzentration von 600 µg/L auf <10µg/L senkt, also unter den WHO-Grenzwert für Trinkwasser.

Remoción de arsénico disuelto con residuos de cenizas de pirita

Resumen

Las cenizas de pirita (PA), un residuo producido durante la tostación de minerales de pirita para producir ácido sulfúrico, fue estudiado como sorbente para remover (As) de agua subterránea. Las muestras de residuos de cenizas de pirita contenían >86% hierro (como Fe2O3). Los resultados indicaron que la adsorción de As por PA fue sólo ligeramente afectada por el pH inicial a pH ≤ 9. La eficiencia de la remoción de arseniato se incrementó con la cantidad de adsorbente agregado en el rango de 0,1-50 g/L. La remoción de As(V) se incrementó con el tiempo y una remoción de 79% se alcanzó en 1 h. Además, no hubo cambios significativos en las concentraciones de As luego de las 24 h. El proceso de adsorción se describe adecuadamente por un modelo cinético de segundo orden. La adsorción de As(V) sobre PA siguió una isoterma tipo Langmuir. En estudios en batch, la máxima eficiencia en la remoción de As(V) fue 97% con 10 g/L de adsorbente y una concentración inicial de As(V) de 300 µg/L. Estos resultados muestran que PA es un sorbente adecuado capaz de reducir la concentración de As desde un nivel inicial de 600 μg/L a <10 μg/L As(V), que es por debajo del límite WHO para agua de consumo humano.

黄铁矿灰渣去除溶解态砷

抽象

黄铁矿灰渣(PA)是在焙烧黄铁矿石制硫酸的过程中产生的废物。研究了黄铁矿灰渣作为吸附剂去除地下水中砷(As)的潜的能力。黄铁矿灰渣样品的含铁量(以Fe2O3形式)大于86%。研究结果表明,在pH≤ 9的条件下,黄铁矿灰渣的砷(As)吸附作用仅受初始pH值影响。吸附剂含量超过0.1-50 g/L以后,砷酸盐(Arsenate)去除率随吸附剂含量增加而提高。五价砷As(V)的去除率随时间延长而提高,1个小时内就可达79%。在反应24小时之后,砷(As)浓度变化不再明显。吸附反应过程符合二级反应动力学模型。在五价砷As(V)初始浓度300µg/L和吸附剂含量10g/L的批次试验中,五价砷As(V)的最大去除率达97%;黄铁矿灰渣(PA)对五价砷As(V)的吸附反应遵循Langmuir isotherm吸附等温曲线。试验证明黄铁矿灰渣(PA)是一种理想的砷吸附剂,能够将砷的浓度由600 μg/L降到10μg/L,低于世卫组织饮用水砷浓度界限。

Notes

Acknowledgments

The authors thank the Karadeniz Technical University Scientific Research Fund (Project Kod No: 2013ARGEBD-9040) for the financial support of this work.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Mining EngineeringKaradeniz Technical UniversityTrabzonTurkey

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