Cadmium Removal from Giant Squid ( Dosidicus gigas ) Hydrolysate in Fixed-Bed Columns Packed with Iminodiacetic Resin: Tools for Scaling up the Process

• Published in: International journal of environmental research and public health 2021-12, Vol.19 (1), p.442
• Main Authors: Calderón, Carolina, Levío-Raimán, Marcela, Diez, M Cristina
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Animals; By products; Cadmium; Chemical composition; Decapodiformes; Giant squids; Hydrolysates; Proteins; Resins; Sodium hydroxide; Velocity; Water Pollutants, Chemical - analysis; Water Purification
• ISSN: 1660-4601; 1661-7827; 1660-4601
• DOI: 10.3390/ijerph19010442

Giant squid hydrolysate (GSH) elaborated from different batches from a fishing company was evaluated for cadmium removal. Fixed-bed column packed with iminodiacetic resin as adsorbent was used. GSH solution at different cadmium concentrations were fed in the fixed-bed column and breakthrough curves were evaluated. A high degree of metal removal from the solution was achieved and the saturation point (C /C ≤ 0.8) was achieved more quickly at higher concentrations of cadmium. The maximum capacity of adsorption (q ) was obtained using the Thomas model, where 1137.4, 860.4, 557.4, and 203.1 mg g were achieved using GSH with concentrations of 48.37, 20.97, 12.13, and 3.26 mg L , respectively. Five cycles of desorption of the resin with HCl (1 M) backflow and regeneration with NaOH (0.5 M) were also evaluated, where no significant differences ( -value > 0.05) were observed between each cycle, with an average of 935.9 mg g of q . The columns evaluated reached a total efficiency of 90% on average after the third column in GSH with a cadmium concentration of 20.97 mg L . This kind of configuration should be considered the best alternative for cadmium removal from GSH. Additionally, the chemical composition of GSH, which was considered a quality parameter, was not affected by cadmium adsorption.