Abstract
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 (Ce/C0 ≤ 0.8) was achieved more quickly at higher concentrations of cadmium. The maximum capacity of adsorption (q0) was obtained using the Thomas model, where 1137.4, 860.4, 557.4, and 203.1 mg g−1 were achieved using GSH with concentrations of 48.37, 20.97, 12.13, and 3.26 mg L−1, 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 (p-value > 0.05) were observed between each cycle, with an average of 935.9 mg g−1 of qmax. The in-series 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−1. 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.
Highlights
The giant squid (Dosidicus gigas) represents the most important squid fishery species in the world, accounting for 15% of global volumes from the total capture of mollusks [1].Mollusks, such as giant squid, can be affected by absorbing and accumulating cadmium in their tissues and digestive glandules
The purpose of this study was to evaluate the use of fixed-bed columns for the removal of cadmium from a giant squid hydrolysate (GSH) using iminodiacetic resin as an adsorbent that does not affect the nutritional components of this product in order to improve the scalability of the process
The cadmium concentrations in the Giant squid hydrolysate (GSH) varied according to the proportion of raw material, where the amount (%) of digestive glands had a relevant influence on the content of cadmium during the process (Table 1), with a correlation coefficient (R2 ) of 0.975
Summary
The giant squid (Dosidicus gigas) represents the most important squid fishery species in the world, accounting for 15% of global volumes from the total capture of mollusks [1]. Mollusks, such as giant squid, can be affected by absorbing and accumulating cadmium in their tissues and digestive glandules. They can assimilate more than 50% of metals present in water in a particulate or dissolved form [2]. During its processing, up to 40% of this mollusk’s body weight is wasted in the form of by-products, including heads, viscera, backbones, ink, skin, fins, arms, tentacles, and unclaimed mantle
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