Fish Scales Wastes from Selected Teleosts-Innovative Sorption Materials for the Recovery of Astaxanthin. This study shows the potential use of fish scalesof telleosts chanos and Tilapia nilotica as natural sorption materials in the recovery of astaxanthin. Astaxanthin, a feed additive, is a major carotenoid responsible for the pink-red pigmentation of fish and shrimps.Aquatic animals cannot synthesize this thus it must be supplemented in their diet. Aside from being a colorant, astaxanthin has both biological and nutritional importance as well as antioxidant property. Astaxanthin therefore needs to be recovered from wastewaters that have been colored withastaxanthin as it may pose serious environmental threats.Fish scales of teleosts: Chanos chanos and Tilapia nilotica were utilized for recovering astaxanthin. The innovation in adsorption is the utilization of solid wastes as natural sorption material and their availability at minimal cost. Synthetic astaxanthin dissolved in water was made to flow in "Fish Scale Adsorption Apparatus" (FSAA) containing unshredded or shredded scales. Comparison of treatments based on the discoloration of filtrate to be released from the FSAA and the length of time the flow lasted revealed that shredded tilapia scales were most effective in retaining the pigments. Scanning electron micrographs of the surface of tilapia scales revealed porous tooth-like structures called sclerits. These pores along with particles scattered on the interspacing between sclerits’ particles were inferred to bind the pigment. Based on the effective filtration features of the tilapia fish scales, it is suggested that the scales be used in wastewater treatment of different factories. Moreover, fish scales as sorption materials for heavy metals should be explored.Further clarification of the procedures and results should be directed to the researchers and adviser. |
Recovery of astaxanthin from seafood wastewater utilizing fish scales waste.
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Abstract: The paper presents basic data on astaxanthin adsorption from fisheries wastewater to fish scales. This process has been proposed to be applicable in fisheries and shrimp waste management [Helgason, Recovery of compounds using a natural adsorbent, Patent WO 01/77230, 2001]. The innovative feature of the method is the application of a solid waste (fish scales) as a natural adsorbent for a carotenoid pigment (astaxanthin) from the seafood industry wastewater. The model investigations were performed with pure synthetic carotenoids to exclude the role of matrix in which astaxanthin is present in the wastewater. Under the experimental conditions used, the maximum loading capacity of astaxanthin onto the scales is 360 mg kg(-1) dry wt. Studies of the thus formed value added product indicated that drying causes significant loss of astaxanthin activity. Due to the effective filtration characteristics of the studied sorption material, we suggest the scale/astaxanthin sorption process to be suitable for treatment of wastewater from different industries.
Recovery of astaxanthin from seafood wastewater utilizing fish scales waste * P. Stepnowskia, , , * G. Ólafssonb, , , , * H. Helgasonb, * B. Jastorffc * a Faculty of Chemistry, University of Gdańsk, ul. J. Sobieskiego 18, 80-952 Gdańsk, Poland * b Environmental Engineering Division, Linuhönnun Ltd., Sudurlandsbraut 4a, 108 Reykjavı́k, Iceland * c Center for Environmental Research and Technology, University of Bremen, Leobener Str. 28359 Bremen, Germany * http://dx.doi.org/10.1016/S0045-6535(03)00718-5, How to Cite or Link Using DOI * Permissions & Reprints
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Abstract
The paper presents basic data on astaxanthin adsorption from fisheries wastewater to fish scales. This process has been proposed to be applicable in fisheries and shrimp waste management [Helgason, Recovery of compounds using a natural adsorbent, Patent WO 01/77230, 2001]. The innovative feature of the method is the application of a solid waste (fish scales) as a natural adsorbent for a carotenoid pigment (astaxanthin) from the seafood industry wastewater. The model investigations were performed with pure synthetic carotenoids to exclude the role of matrix in which astaxanthin is present in the wastewater. Under the experimental conditions used, the maximum loading capacity of astaxanthin onto the scales is 360 mg kg−1 dry wt. Studies of the thus formed value added product indicated that drying causes significant loss of astaxanthin activity. Due to the effective filtration characteristics of the studied sorption material, we suggest the scale/astaxanthin sorption process to be suitable for treatment of wastewater from different industries.
Keywords
* Astaxanthin recovery; * Fish scales as adsorbent; * Fisheries waste treatment
Figures and tables from this article:
Fig. 1. Experimental set-up with indicated sampling ports.
Figure options
Fig. 2. Sorption capacity of astaxanthin from wastewater on compressed not milled scales (column length: 10 cm; scales: 3.5 g (dry wt.); 52 ml g−1 (volume); fractions: 10 ml each.
Figure options
Table 1. Astaxanthin concentrations in the fractions (ii)–(v) (mg kg−1 dry wt.) and wastewater (mg l−1 wet wt.) from the sorption experiment before and after drying in 40 °C for 12 h
Show thumbnails in outline * Abstract
* Keywords
* 1. Introduction
* 2. Materials and methods
* 2.1. Fish scales and wastewater
* 2.2. Astaxanthin solvent extraction and analysis
* 2.3. Sorption experiments
* * 3. Results and discussion
* 3.1. Astaxanthin in the scale pigment product
* Table 1 * 3.2. Effects of different particle size on adsorption of pigments from the wastewater
* 3.3. Sorption capacity and efficiency of the fish scales
* * 3.4. Sorption and desorption of synthetic astaxanthin in the free form
* 4. Conclusions
* Acknowledgments
* References
References:
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