Method and system for treating polyhydroxyalkanoate fermentation liquid by membrane filtration and application of obtained fermentation waste liquid

Abstract

The invention relates to the field of preparation of bio-based material polyhydroxyalkanoate, and in particular, relates to a method and system for treating polyhydroxyalkanoate fermentation liquor through membrane filtration. The method comprises the steps: carrying out solid-liquid separation on fermentation liquor of polyhydroxyalkanoate to obtain fermentation clear liquor; and then carrying out membrane filtration on the fermentation clear liquid to remove impurities in the fermentation clear liquid so as to obtain treated fermentation clear liquid. The system comprises a first solid-liquid separation unit and a membrane filtration unit, the first solid-liquid separation unit is used for carrying out solid-liquid separation on a fermentation broth of polyhydroxyalkanoate to obtain thefermentation clear liquid; the membrane filtration unit is used for carrying out membrane filtration on the fermentation clear liquid so as to remove the impurities in the fermentation clear liquid, so that the treated fermentation clear liquid is obtained and is reused in the next fermentation. According to the method and the system, the production cost of PHA can be effectively reduced, and thefermentation efficiency and the PHA yield of PHA fermentation strains can be effectively guaranteed.

Description

technical field [0001] The invention relates to the field of preparation of biological substrate polyhydroxyalkanoate, in particular to a method and a treatment system for treating polyhydroxyalkanoate fermentation liquid by membrane filtration, and the obtained treated fermentation liquid is fermented in PHA in the application. Background technique [0002] Polyhydroxyalkanoate (PHA) is a general term for a class of polymer polyesters that are completely synthesized by microorganisms. PHA is biodegradable and biocompatible, so it is considered as an environmentally friendly material, which helps to solve the increasingly serious environmental pollution problem. Although the use of PHA can effectively avoid the harm caused by petrochemical plastics to the environment, at present, the production cost of this environmentally friendly bioplastic is high, and the commercial development of PHA has been restricted by its high production cost. In order to reduce costs, research R...

AI Technical Summary

Problems solved by technology

Although the use of PHA can effectively avoid the harm caused by petrochemical plastics to the environment, at present, the production cost of this environmentally friendly bioplastic is high, and the commercial development of PHA has been restricted by its high production cost. In order to reduce costs, research Researchers have been working on solving the problems of high cost of substrate and sterilization, low yield, etc.

[0003] Selecting high-quality, high-yielding, non-infectious chassis bacteria is an effective way to improve quality and reduce costs. Halophilic bacteria are high-quality and high-yielding strains that have been bred in recent years. Although they have reduced the production cost of PHA to a certain extent, but Its fermentation process requires a high concentration of salt environment

Due to the use of a large amount of inorganic salts, on the one hand, it will also lead to high production costs, on the other hand, the high-salt wastewater produced is also facing the problem that it needs to be treated at a high cost

Images