Recovery of solids from surimi wash water and preparation of a fish feed with the recovered solids
By: Jibina M.M.
Contributor(s): Krishnakumar S(Guide).
Material type:
BookPublisher: Panangad Department of Processing Technology,College of Fisheries 2010Description: 68.DDC classification: 631.56 Online resources: Click here to access online Dissertation note: MSc. Abstract: A study was conducted aimed at testing the efficiency of pH reduction and heat coagulation in the recovery of solids from surimi wash water (SWW) generated during water leaching of the meat of tilapia (Oreochromis mossambicus) and to reduce the nutrient load in SWW. The study also included the preparation of a fish feed with the recovered solids.
Temperature for heat coagulation was optimized among four different temperatures viz., 65oC, 70oC, 75oC and 80oC. Optimum temperature that provided maximum recovery was 75 oC. Isoelectric precipitation was optimized using four different pH levels viz., 4.0, 4.5, 5.0, and 5.5. Optimum pH which yielded maximum recovery was pH 5.0. By heat coagulation 1.97% solids with respect to SWW was recovered whereas isoelectric precipitation yielded only 1.41% solids. In relation to surimi the yield was 1.22% and 0.88% respectively. Heat coagulation reduced crude protein, crude fat and ash of SWW by 53.49%, 68.75% and 38.57% respectively whereas isoelectric precipitation reduced these parameters by 33.72%, 43.75% and 38.57% respectively. Heat coagulation reduced BOD and COD of SWW by 59.51% and 69.35% respectively whereas isoelectric precipitation reduced their levels by 52.92% and 63.9% respectively. Analysis of proximate composition of fish feed showed that the control using clam meat and the two feeds using recovered solids showed similar composition. Thus the use of these recovered solids in fish feed as an animal protein source is a possibility.
This study recommends to surimi industry, two methods that are comparatively cheap and easy to implement for recovering solids from SWW. Heat coagulation and isoelectric precipitation can effectively recover solids from SWW and improve its quality. However, heat coagulation is the more efficient method of the two. After solid recovery, the wash water effluents are rendered safer. The recovered solids can serve as a good substitute to clam meat in the fish feed preparation even though the quantum of proteins recovered are relatively small.
| Item type | Current location | Call number | Status | Date due | Barcode |
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Theses
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KAU Central Library, Thrissur Theses | 631.56 JIB/RE (Browse shelf) | Available | 173049 |
MSc.
A study was conducted aimed at testing the efficiency of pH reduction and heat coagulation in the recovery of solids from surimi wash water (SWW) generated during water leaching of the meat of tilapia (Oreochromis mossambicus) and to reduce the nutrient load in SWW. The study also included the preparation of a fish feed with the recovered solids.
Temperature for heat coagulation was optimized among four different temperatures viz., 65oC, 70oC, 75oC and 80oC. Optimum temperature that provided maximum recovery was 75 oC. Isoelectric precipitation was optimized using four different pH levels viz., 4.0, 4.5, 5.0, and 5.5. Optimum pH which yielded maximum recovery was pH 5.0. By heat coagulation 1.97% solids with respect to SWW was recovered whereas isoelectric precipitation yielded only 1.41% solids. In relation to surimi the yield was 1.22% and 0.88% respectively. Heat coagulation reduced crude protein, crude fat and ash of SWW by 53.49%, 68.75% and 38.57% respectively whereas isoelectric precipitation reduced these parameters by 33.72%, 43.75% and 38.57% respectively. Heat coagulation reduced BOD and COD of SWW by 59.51% and 69.35% respectively whereas isoelectric precipitation reduced their levels by 52.92% and 63.9% respectively. Analysis of proximate composition of fish feed showed that the control using clam meat and the two feeds using recovered solids showed similar composition. Thus the use of these recovered solids in fish feed as an animal protein source is a possibility.
This study recommends to surimi industry, two methods that are comparatively cheap and easy to implement for recovering solids from SWW. Heat coagulation and isoelectric precipitation can effectively recover solids from SWW and improve its quality. However, heat coagulation is the more efficient method of the two. After solid recovery, the wash water effluents are rendered safer. The recovered solids can serve as a good substitute to clam meat in the fish feed preparation even though the quantum of proteins recovered are relatively small.
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