Preparation method for biological flocculant

Abstract

The invention discloses a method to prepare bio-flocculant. The invention is characterized in that aspergillus fermentating cultivation is adopted. The aspergillus is agitated and fermented (28-30 DEG C, pH6-7, under ventilating condition) for 48-60 hours; the fermentation broth is filtered and condensed, and then proper amount of ethanol is added into the condensed broth and centrifugal separation is conducted after stewing; the deposition is washed with ethanol and dried in vacuum to achieve a crude product of fawn flocculant. The prevention method has the advantages of simple condition of production and low cost. The bio-flocculant prepared by the method is applicable to disposing sewage containing granular contaminants or filth, and the dosage generally drops in 0.1 to 0.3 per mill. It is proved by flocculation treatment that, compared with the prior art, the invention has sound flocculation effect, low flocculant speed and small dosage; besides, the invention is environment-friendly and harmless to human body.

Description

technical field [0001] The invention belongs to a method for preparing a biological flocculant by using microorganisms, and relates to the technical field of sewage treatment. Background technique [0002] The flocculation and sedimentation method occupies an extremely important position in water treatment. The proportion of domestic and foreign industrial wastewater treatment using the flocculation and sedimentation method accounts for 60%-75%, while almost 100% of the tap water industry uses the flocculation method as a means of water purification. At present, the flocculants widely used in water treatment mainly include inorganic polymer flocculants and organic polymer flocculants. Because inorganic flocculants are generally used in large amounts and are likely to cause secondary pollution to the environment, such as aluminum ions in the series of polyaluminium, they will cause harm to human health; while the residues of organic polymer flocculants (such as: polyacrylamid...

AI Technical Summary

Problems solved by technology

[0003] After searching, the relevant patents in this field include: 1. the method for preparing bioflocculant by Arthrobacter (application number is 200310105515.X), from the perspective of the medium composition of its production, the cost is relatively high, and the pH of wastewater treatment is relatively high. In 6-9, the scope of action is relatively narrow, and its flocculation and sedimentation effect is not clear

2. A sphingella and a method for preparing a glycoprotein bioflocculant by using it (the application number is 200410023988.X), the flocculation effect of this flocculant is relatively low, and the cost is high; 3. It is prepared from Nocardia A biological flocculant (application number 01108045.0), whose flocculation effect is relatively low; ④The production bacteria and production process of microbial flocculants using bean dregs (application number 200610031485.6), the invention is prepared by Paenibacillus polymyxa Biological flocculant, its production process is relatively complicated, the flocculation rate of kaolin can reach 94%, and the flocculation effect is relatively low; In the flocculation effect test, the inorganic flocculant aluminum chloride was used as a coagulation aid, and aluminum chloride itself is a flocculant with a good flocculation effect. Therefore, the flocculation effect of the flocculant of the invention was not reflected.

[0004] In the above patent applications, there is generally a shortcoming that the flocculation effect of the prepared flocculant is not high