A kind of combined production method of chitosan and seaweed fertilizer

Abstract

The invention provides a chitosan and seaweed fertilizer joint production method and belongs to the technical field of aquatic product processing. In the chitosan production process, potassium hydroxide replaces sodium hydroxide and then potassium hydroxide waste liquor is used as a digestant for seaweed fertilizer production; hydrochloric acid is replaced by nitric acid and nitric acid waste liquor replaces part of phosphoric acid to be used as a neutralizer for a seaweed digestive liquid. The traditional thinking is changed, waste alkali liquor is utilized instead of being treated, the waste is turned into wealth, and treatment of the waste alkali liquor in chitosan production is avoided. Meanwhile, the potassium hydroxide waste liquor contains a large quantity of organic matters such as animal protein and the like, and the nitric acid waste liquor contains abundant calcium and microelements, so that produced seaweed fertilizer is rich in nutrition and better in fertilizer efficiency. Two production technologies are combined, the production cost of chitosan and the seaweed fertilizer is reduced, the quality of the seaweed fertilizer is improved, and the win-win effect is realized.

Description

Technical field [0001] The invention belongs to the technical field of aquatic product processing, and specifically relates to a combined production method of chitosan and seaweed fertilizer. Background technique [0002] Chitosan is a natural polymer biopolysaccharide. It is another essential element to maintain human life after protein, fat, and vitamins. It is an important raw material for medicine, food, light industry, chemical industry, and environmental protection. Shrimp, crab and other crustaceans are rich in chitosan, which is the main raw material for producing chitosan. The main production process of using shrimp shells or crab shells to produce chitosan is: use hydrochloric acid solution to remove calcium and other inorganic minerals in shrimp and crab shells, and sodium hydroxide solution to remove protein and other organic matter in and on the shells, and finally use 40 The finished chitosan is obtained by removing the acetyl group from the sodium hydroxide soluti...

AI Technical Summary

Problems solved by technology

The production process is simple and has strong applicability, but it produces a large amount of waste water, which contains strong acid, strong alkali and organic matter, which seriously pollutes the environment.

This kind of wastewater treatment is difficult and expensive, and a large amount of protein, residual alkali and other useful components in the wastewater also cause a lot of waste of resources while polluting the environment

[0003] In recent years, new chitosan production processes and wastewater treatment methods have been reported at home and abroad, such as enzymatic hydrolysis instead of strong alkali for protein removal, strong alkali recycling, etc., but there are shortcomings such as high production costs and large equipment investment.