Method for removing proteins in protein-enriched wastewater

Abstract

The invention relates to a method for removing proteins in protein-enriched wastewater, which comprises the following steps of: carrying out isoelectric point analysis on ingredients of the proteins in the protein-enriched wastewater and determining a grouped and graded treatment scheme according to isoelectric points of the proteins from large to small; after carrying out pretreatment on the wastewater, transferring the wastewater into a reaction kettle; filling volatile weak acid gas into the reaction kettle, regulating the pH value of the wastewater to guarantee the pH value to reach the relatively large isoelectric point in the grouped and graded treatment scheme and guaranteeing the proteins at the relatively large isoelectric point to be sufficiently precipitated; carrying out solid-liquid separation to remove protein precipitates; continuing to fill the volatile weak acid gas into the reaction kettle and reducing the pH value of the solution grade by grade to sequentially obtain the protein precipitates on each corresponding grade and finally purified supernatant; and releasing the volatile weak acid gas in the finally purified supernatant and recovering the volatile weak acid gas. The volatile weak acid gas is CO2 or CO2 with acetic acid. Due to the adoption of the method disclosed by the invention, the protein removal rate is high; the treated wastewater has low subsequent treatment cost; and the wastewater treatment process is mild and reversible and has strong controllability.

Description

[0001] technical field [0002] The invention relates to separating protein from waste water, in particular to a method for removing protein from protein-rich waste water by means of protein isoelectric point precipitation. Background technique [0003] During the processing of some protein-rich animal and plant raw materials such as meat, fish and soybeans, protein-rich wastewater is often produced. Especially in the processing of minced meat and surimi, there is a large amount of protein-rich wastewater with high organic matter content and high COD (chemical oxygen demand) value, the most important of which is a large amount of water-soluble protein. Using traditional A / O process (anaerobic aerobic process) treatment is difficult to meet the national standard, and the cost of wastewater treatment is quite high, using aerobic biological treatment consumes a lot of energy, while using conventional anaerobic biological treatment, when reaching the methanation stage, it takes ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art that proteins at different isoelectric points cannot be continuously removed during the treatment of protein-rich wastewater, the protein removal rate is low, the subsequent treatment cost after wastewater treatment is high, and the controllability of the wastewater treatment process is poor, the present invention provides a A method for removing protein in protein-rich wastewater. Using this method to treat protein-rich wastewater not only has a high protein removal rate, but also the wastewater treatment process is mild, reversible, and highly controllable, and the subsequent treatment cost after wastewater treatment is low.