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

Hajime Sugita (), Terumi Oguma, Junko Hara, Ming Zhang and Yoshishige Kawabe
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Hajime Sugita: Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan
Terumi Oguma: Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan
Junko Hara: Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan
Ming Zhang: Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan
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

Sustainability, 2023, vol. 15, issue 5, 1-22

Abstract: The effects of the combined addition of Mg- and Ca-based adsorbents (MgO, Mg(OH) 2 , MgCO 3 , CaO, Ca(OH) 2 , and CaCO 3 ) 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 MgCO 3 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 MgCO 3 inhibited Ca-leaching. Improvement in arsenic-removal performance for the combination of MgCO 3 with CaO or Ca(OH) 2 was caused by the incorporation and co-precipitation with arsenic when Mg(OH) 2 and CaCO 3 were produced. MgCO 3 -Ca(OH) 2 and MgCO 3 -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 (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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