A process for adsorbing heavy metal chromium in protein enzymatic hydrolyzate

Abstract

The invention discloses a technology for adsorption of heavy metal chromium in a proteolysis liquid. The technology mainly comprises proteolysis liquid chromium concentration adjustment, pH adjustment, composite adsorbent preparation, and adsorption and separation. The adsorbent is a polyethyleneimine-modified carboxylic nanocrystal cellulose-sepiolite composite adsorbent and has the advantages of good heavy metal adsorption effects and little side effect. The technology has simple and easy processes. The adopted adsorbent can be removed easily and does not cause other pollution.

Description

technical field [0001] The invention relates to the technical field of protein processing, in particular to a process for adsorbing heavy metal chromium in protein hydrolyzate. Background technique [0002] Protein enzymatic hydrolyzate is a nutrient made from waste animal and plant protein, usually made from low-value fish or aquatic product leftovers. In recent years, due to the random discharge of industrial and agricultural sewage into the sea, the burning of fossil fuels containing heavy metals, domestic sewage entering the sea with rivers, and the increasing frequency of coastal and marine activities, the increase of heavy metals in seawater, especially the excessive chromium and cadmium ions, is particularly serious. As a result, the content of chromium and cadmium ions in aquatic products that are easy to enrich heavy metals exceeds the standard, and the content of chromium and cadmium ions in the proteolysis solution prepared from corresponding low-value aquatic pro...

AI Technical Summary

Problems solved by technology

The chemical precipitation method is to add alkali to the required heavy metal removal liquid to precipitate the heavy metal ions, and then remove the precipitated heavy metals through physical methods. This method will not only change the pH value of the liquid, but also introduce some other ions. If this method is used to remove chromium and cadmium ions in the proteolytic solution, the use effect of the original liquid may be affected. If this method is used to remove chromium and cadmium ions in the liquid protein fertilizer, the additional aluminum ions and iron ions introduced by the precipitant will The denaturation of the protein in the protein fertilizer will also affect the growth of the crops applied to the protein fertilizer; the ion exchange method is to use the ion exchange agent to exchange with the ions in the liquid to separate the ions. The ion exchange resin is an insoluble high Molecular compounds, if this method is used to remove chromium and cadmium ions in the proteolysis solution, the ion exchange resin will be difficult to remove after being added to the proteolysis solution, which will affect the application effect of the proteolysis solution