Frontiers of Environmental Science & Engineering
>> 2016,
Volume 10,
Issue 3
doi:
10.1007/s11783-015-0809-7
RESEARCH ARTICLE
Utilization of aluminum hydroxide waste generated in fluoride adsorption and coagulation processes for adsorptive removal of cadmium ion
1. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.2. University of Chinese Academy of Sciences, Beijing 100039, China.3. Department of Chemical Engineering, Monash University, Clayton VIC 3800, Australia
Accepted: 2015-07-28
Available online: 2016-04-05
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Abstract
Although Al-based coagulation and adsorption processes have been proved highly efficient for fluoride (F) removal, the two processes both generate large amount of Al(OH) solid waste containing F (Al(OH) -F). This study aimed to investigate the feasibility of utilizing Al(OH) -F generated in Al(OH) adsorption (Al(OH) -F ) and coagulation (Al(OH) -F ) for the adsorption of cadmium ion (Cd(II)). The adsorption capacity of Al(OH) -F and Al(OH) -F for Cd(II) was similar as that of pristine aluminum hydroxide (Al(OH) ), being of 24.39 and 19.90 mg·g , respectively. The adsorption of Cd(II) onto Al(OH) -F and Al(OH) -F was identified to be dominated by ion-exchange with sodium ion (Na ) or hydrogen ion (H ), surface microprecitation, and electrostatic attraction. The maximum concentration of the leached fluoride from Al(OH) -F and Al(OH) -F is below the Chinese Class-I Industrial Wastewater Discharge Standard for fluoride (<10 mg·L ). This study demonstrates that the Al(OH) solid wastes generated in fluoride removal process could be potentially utilized as a adsorbent for Cd(II) removal.
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