Study On Comprehensive Utilization Of Seafood Processing Wastewater

Seafood processing wastewater contains a lot of fish resources protein, amino acids, and is rich in unknown growth factor, colloids, suspension of insoluble and so on. There still a certain amount of nucleotide and valuable resources were wasted because of difficult recovery. At present, the domestic recovery and utilization of these resources is still in a comparatively low level of the degree, a large number of fish protein resources with the wastewater discharge, but it also has increased the difficulty of wastewater treatment.Association Nibea-bottom carnivorous fish of coastal fish, mainly prawns, crabs, small fish and benthic animals for food. The distribution of the fish is in the South China Sea, the Taiwan Strait and along the coast of southern Zhejiang. The color of these lanes is silver grey or silver white, and the whales are closer to the Association of fish, commonly known as "white fish Association." Delicate meat, toughness and taste delicious, mainly exported to Taiwan, Hong Kong and Macao regions. Its wastewater component analysis found: wastewater more balanced amino acid protein, seafood wastewater high ash content, can be used to feed nutritional supplements.This paper studied first time the comprehensive utilization of Nibea fish production process wastewater. The component of the wastewater was analyzed, and the protein flocculation, membrane separation of soluble protein, protein decomposition process and scale collagen protein extraction were studied.Recovery of protein from seafood wastewater was studied by using chitin (CH), aluminum sulfate (AS), ferric sulfate (FS) and polyacrylamide as flocculants. Results indicated that the flocculating ability of chitin was better than that of three others, and it obtained higher protein recovery rate and transmittance of enfluence. Protein recovery rate was over 72% and its content of crude protein was 79.7% when 100 mg/L AS, 100 mg/L FS and 40 mg/L CH were used.Separation of Nanofiltration technique on wastewater protein was studied, and the mathematical model was established. The model results were in good agreement with experimental data for seafood Nanofiltration Membrane filtration of wastewater protein.Research was carried out on the wastewater protein hydrolysis process. By orthogonal experiment established the neutral protease preparation of fish protein, protein recovery in optimum conditions after enzymatic hydrolysis was more than 90%.The use of the fish scale from the seafood wastewater by filtration was studied. Through orthogonal experiment, the best fish collagen protein extraction process was: temperature 90℃for six hours, protein-water ratio 1:4, the rate is 60.8 mg coarse collagen proteins / g fish scale. This paper studied the comprehensive utilization of Nibea fish wastewater and provided a possible way and reference for research of comprehensive utilization for our country engaged in fish processing.