Simultaneous Arsenic and Fluoride Removal from Contaminated Water Using Powder Reagents of CaO, Ca(OH) 2, and CaCO 3 as Calcium-Based Adsorbents

Hajime Sugita (), Kazuya Morimoto, Takeshi Saito and Junko Hara
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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
Kazuya Morimoto: Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan
Takeshi Saito: 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

Sustainability, 2025, vol. 17, issue 17, 1-31

Abstract: As and F contamination are a global problem, and their simultaneous contamination in groundwater is a frequent occurrence, necessitating strategies for their concurrent removal. This study evaluated the performance and potential applicability of Ca-based adsorbents (CaO, Ca(OH) 2 , and CaCO 3 ) for simultaneous As–F removal. Removal tests were performed using synthetic contaminated water with an initial As concentration of 1 mg/L and initial F concentrations of 15–60 mg/L. The results showed that CaCO 3 had difficulty removing As and F in contaminated water; in contrast, CaO and Ca(OH) 2 achieved simultaneous As–F removal under certain conditions. Regardless of the presence or absence of F, the water purified using CaO and Ca(OH) 2 met the As environmental standard (0.01 mg/L) for As(V) and As effluent standard (0.1 mg/L) for As(III). Meanwhile, with or without As, CaO- and Ca(OH) 2 -treated water met the F environmental standard (0.8 mg/L) at a concentration of 15 mg/L and F effluent standard (8 mg/L for non-marine areas) at 30 and 60 mg/L. In this study, where the initial As concentration was set to a constant value, the degree of mutual effects on As and F adsorption behavior differed depending on the combination of adsorbent addition and initial F concentrations.

Keywords: arsenic removal; fluoride removal; simultaneous removal; calcium compound; adsorption behavior (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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