Comparison of ion exchange process configurations for arsenic removal from natural waters. Issue 29 (20th June 2016)

• Record Type: Journal Article
• Authors: Laatikainen, Markku; Sillanpää, Mika; Sainio, Tuomo
• Is Part Of: Desalination and water treatment. Volume 57:Issue 29(2016)
• Page Start: 13770
• Page End: 13781
• Publication Date: 2016-06-20
• Subjects: Arsenic removal -- Ion exchange -- Modeling -- Batch operation -- Simulated moving bed; Saline water conversion -- Periodicals; Saline water conversion; Water -- Purification; Periodicals; 628.167
• DOI: 10.1080/19443994.2015.1061456
• Languages: English
• ISSNs: 1944-3994

Abstract

Abstract: Influence of process configuration on ion exchange of As(V) was studied using numerical simulations. A new explicit competitive ion exchange model was introduced to facilitate fast computation. Model parameters were determined using published data on arsenic removal from contaminated waters by hydrous ferric oxide (HFO) hybrid materials and strong anion exchangers (SBA). Performance of batch and continuous processes was assessed in terms productivity and resin utilization. It was shown that the HFO resin with very high As(V) selectivity is best utilized in batch operation and counter-current simulated moving bed (SMB) configuration does not give any advantage. The SBA resin has low selectivity for As(V) anions and counter-current operation was found to be essential. A steady state SMB system with continuous removal of the concentrated As(V) fraction was proposed. It was also shown that productivity of both systems can be substantially increased using shallow beds and short loading cycles.