Ultrafiltration device report: Microbial flocculant is a new type of flocculant developed in recent years for new products. It is obtained from microorganisms or their essential substances using biotechnology. A new type of water treatment agent obtained from purification, which is safe, highly advanced, and naturally soluble, such as glycoproteins, sugar containing methyl cellulose, proteins, and DNA. Due to the biodegradability and reliability of microbial flocculants, they can ultimately be tested for zero pollution discharge. Its significant characteristics and advantages have shown a broad market prospect for the development trend of water treatment. Microbial flocculants may replace or overwhelmingly replace traditional inorganic polymer materials and generate organic polymer flocculants.

The microorganisms that cause flocculants are bacterial strains with the ability to metabolize flocculants. So far, more than 17 species have been discovered, including molds, pathogens, spores, and yeast. Therefore, there are also various types of microbial flocculation bacteria. Symbolic ones include: flocculant AJ7002 caused by Aspergillus niger; Microbial flocculant PF101 caused by sodium pseudopenicillin; And the microbial flocculant NOC-1 developed by using red flat fine Gram negative bacteria.

The flocculation principle of microbial flocculants suggests that the macromolecules of microbial flocculants rely on ionic bonds, covalent bonds, and van der Waals forces, as well as adsorbing several colloidal particles, creating a "railway bridge" between the particles, thereby creating a three-dimensional network structure and settling. The entire flocculation process involves the interaction between colloidal particles and microbial flocculant macromolecules. The entire process of adsorption and generation of porous structures. Therefore, the surface positive charge of flocculant macromolecules and colloidal particles poses a significant threat to the actual flocculation effect, and the pH of the system software immediately endangers the surface positive charge, which in turn also endangers their proximity and personal behavior of adsorption; The various positive ions in the system software, especially those with different high valence points, can significantly change the colloidal potential difference. For example, the harm of positive ions, especially the addition of Ca2+, reduces the negative charge on the surface of flocculant macromolecules and colloidal particles, and promotes the generation of "railway bridges".

Ultrafiltration device report: Compared with inorganic or organic high polymer material flocculants, microbial flocculants have high specificity, universal flocculation scope, safe and harmless, and no environmental pollution. They can be widely used in water supply and drainage and wastewater treatment.

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