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Sustainability
Volume 15
Issue 5
10.3390/su15054689
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Article

Removal of Arsenate from Contaminated Water via Combined Addition of Magnesium-Based and Calcium-Based Adsorbents

by
Hajime Sugita
*,
Terumi Oguma
,
Junko Hara
,
Ming Zhang
† and
Yoshishige Kawabe
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan
*
Author to whom correspondence should be addressed.
†
Deceased author 16 July 2022.
Sustainability 2023, 15(5), 4689; https://doi.org/10.3390/su15054689
Submission received: 1 February 2023 / Revised: 2 March 2023 / Accepted: 3 March 2023 / Published: 6 March 2023
(This article belongs to the Special Issue Wastewater Treatment and Purification)
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Abstract

The effects of the combined addition of Mg- and Ca-based adsorbents (MgO, Mg(OH)2, MgCO3, CaO, Ca(OH)2, and CaCO3) were systematically tested for improving arsenic-removal performance and inhibiting the leaching of base material components from the adsorbent. Arsenic-removal tests were conducted with each single type or combination of two types of adsorbents. Results obtained after the combined-addition tests were compared with those obtained from the single-addition test with each adsorbent. The arsenic-removal performance improved in most combined additions but decreased in certain combined additions of MgO or Mg(OH)2 with Ca-based adsorbents. The arsenic-removal performance of the combined addition of MgCO3 and Ca(OH)2 was the highest. The combination of Mg-based adsorbents with CaO or Ca(OH)2 inhibited Mg-leaching, whereas that of CaO or Ca(OH)2 with MgCO3 inhibited Ca-leaching. Improvement in arsenic-removal performance for the combination of MgCO3 with CaO or Ca(OH)2 was caused by the incorporation and co-precipitation with arsenic when Mg(OH)2 and CaCO3 were produced. MgCO3-Ca(OH)2 and MgCO3-CaO are recommended for both arsenic removal and environmental adsorbent stability that can be effectively applied over a wide range of arsenic concentrations.
Keywords: arsenic removal; adsorption; leaching; magnesium compounds; calcium compounds arsenic removal; adsorption; leaching; magnesium compounds; calcium compounds

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MDPI and ACS Style

Sugita, H.; Oguma, T.; Hara, J.; Zhang, M.; Kawabe, Y. Removal of Arsenate from Contaminated Water via Combined Addition of Magnesium-Based and Calcium-Based Adsorbents. Sustainability 2023, 15, 4689. https://doi.org/10.3390/su15054689

AMA Style

Sugita H, Oguma T, Hara J, Zhang M, Kawabe Y. Removal of Arsenate from Contaminated Water via Combined Addition of Magnesium-Based and Calcium-Based Adsorbents. Sustainability. 2023; 15(5):4689. https://doi.org/10.3390/su15054689

Chicago/Turabian Style

Sugita, Hajime, Terumi Oguma, Junko Hara, Ming Zhang, and Yoshishige Kawabe. 2023. "Removal of Arsenate from Contaminated Water via Combined Addition of Magnesium-Based and Calcium-Based Adsorbents" Sustainability 15, no. 5: 4689. https://doi.org/10.3390/su15054689

APA Style

Sugita, H., Oguma, T., Hara, J., Zhang, M., & Kawabe, Y. (2023). Removal of Arsenate from Contaminated Water via Combined Addition of Magnesium-Based and Calcium-Based Adsorbents. Sustainability, 15(5), 4689. https://doi.org/10.3390/su15054689

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