A process for adsorbing heavy metal cadmium in protein enzymatic hydrolyzate

Abstract

The invention discloses a process for adsorbing heavy metal cadmium in protein hydrolysate. The process mainly comprises the steps of adjusting the concentration of chromium in the protein hydrolysate, adjusting a pH value, preparing a composite adsorbent, adsorbing, separating and the like. The adsorbent adopted by the process disclosed by the invention is a polyethyleneimine modified carboxylation nano-crystalline cellulose and sepiolite composite adsorbent, and has the advantages of good effect of adsorbing heavy metal and hardly any side effects; the process for adsorbing the heavy metal cadmium in the protein hydrolysate is simple and feasible; in addition, the adopted adsorbent is easily removed, so no pollution is caused.

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