Abstract
In this study, six macroporous resins were screened on their adsorption and de-adsorption characteristics for the amygdalin in the debitterizing wastewater concentrate (DWC). The results indicate that the XDA-1 resin exerts good adsorption and de-adsorption capacities on the amygdalin. In order to further confirm its feasibility, the factors affecting the capacity of adsorption and de-adsorption, and its adsorption mechanisms were also investigated. The results suggest that the optimum purification conditions were as follows: loading concentration of samples with 78.05 mg/mL, flow rate of 2 mL/min, and de-adsorption with 80% ethanol solution. The recovery rate was 88.75% and the relative content achieved 61.58% after purification by XDA-1 resin. The Freundlich model can be used to describe the entirety of the exothermic and physical adsorption processes. In summary, the conclusion which can be made from this research is that the wastewater generated from the debitterizing of apricot kernels can be well treated by resin to recycle the amygdalin and reduce its pollution to environment.
Highlights
Apricot (Prunus armeniaca L.) is a globally popular fruit crop due to its delicious taste, appealing smell and color [1]
Amygdalin is a characteristic component of the apricot kernels, which has an approximate content of 3–5% (g/100 g) [7]
The amygdalin can be hydrolyzed to hydrogen cyanide (HCN) in the body, which is a potentially toxigenic substance [8]
Summary
Apricot (Prunus armeniaca L.) is a globally popular fruit crop due to its delicious taste, appealing smell and color [1]. Apricot kernels contain many nutritional components, such as oil, proteins, fibers [3,4], carbohydrates, vitamins [5], unsaturated fatty acids, phytosterols [4], carotenoids, phenolic compounds [2], minerals [6], and so on. Amygdalin is a characteristic component of the apricot kernels, which has an approximate content of 3–5% (g/100 g) [7]. The removal of amygdalin (debitterizing) is a necessary procedure in apricot kernel processing [9]. In the process of debitterizing, many components are transferred to the debitterizing water, such as proteins, amygdalin and phenols, causing the water to become dark brown and leading to environmental pollution if discharged without any treatment [10,11]. The emission of this polluted water is severely prohibited by the environmental protection sectors in China
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