Method for extracting fish protein from wastewater for processing aquatic product

Abstract

The invention provides a method for extracting fish proteins from fishery manufacturing wastewater, comprising steps as follows: removing lipid floating on the wastewater first; conducting an isoelectric point determination for wastewater with particles of fish meat removed; regulating the pH values of the wastewater until to the isoelectric point, which enables the proteins to be settled; removing supernatant to acquire protein solutions; finally gaining wet proteins from the protein solutions through a centrifugal method. The method for extracting fish proteins from fishery manufacturing wastewater is characterized in that: the isoelectric point determination is carried out first, then a separation method through isoelectric points is applied for the protein, rendering the proteins to be settled, and finally a centrifugal separation method is used to acquire the proteins. The method for extracting fish proteins from fishery manufacturing wastewater has the advantages of effectively extracting fish proteins from the fishery manufacturing wastewater, small investment, simple operation, low cost, high extraction rate and waste reuse.

Description

technical field [0001] The invention relates to a method for extracting fish protein from aquatic product processing wastewater. Background technique [0002] Aquaculture processing wastewater contains fish fines and water-soluble fish protein. For example, in the rinsing and cooking juice of surimi and fish fillets, the total protein content is generally 0.5%-3%. According to environmental protection requirements, the discharge of these waste water must be treated before proceeding. The concepts of fish meat and fish protein in the present invention refer to the meat quality and protein of all aquatic animals. The prevailing treatment method for aquatic product processing wastewater is to use anaerobic method, aerobic method, air flotation and biochemical treatment to first settle the organic matter such as protein in the wastewater into a mud cake, and then use a sedimentation agent to dissolve the dissolved in the wastewater. Precipitation of protein, etc., so that the...

AI Technical Summary

Problems solved by technology

Among them, the centrifugation method is to settle the solid protein particles in the juice by centrifugal force, but this method cannot extract the water-soluble protein in the juice; the vacuum concentration method is to extract the protein by concentrating the liquid after vacuum evaporation, but this method consumes a lot of energy; The coagulant sedimentation method is to settle the protein with a coagulant, and the coagulant must be added and the purity of the obtained protein is not high

It can be seen that there is currently no simple and economical method for extracting protein in wastewater that can be applied to the extraction of fish protein in aquatic product processing wastewater.

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