A kind of microbial flocculant, preparation method and application thereof

Abstract

The invention discloses a method for preparing a microbial flocculant by utilizing crop straws and surplus activated sludge, which comprises the steps of implanting the bacterial strain into a seed culture medium and cultivating to obtain a seed liquid; The fermentation medium is supplemented with phosphate and activated sludge at a specific time during the fermentation process, and fermented to obtain a fermentation broth; the microbial flocculant is extracted by rotary evaporation and ice bath acetone. The invention effectively utilizes cheap and easy-to-obtain crop straws and remaining activated sludge to prepare microbial flocculants, saves expensive materials of traditional culture medium, has simple preparation method and extraction process, short fermentation time, and greatly reduces the preparation cost of microbial flocculants . The prepared microbial flocculant has a wide application range, a flocculation activity as high as 96.8%, a good removal effect on COD, ammonia nitrogen, turbidity, etc. in wastewater, and can greatly improve sludge dewatering efficiency.

Description

technical field [0001] The invention belongs to the technical field of environmental protection methods, in particular to the technical field of wastewater treatment, and in particular relates to a microbial flocculant and its preparation and application in wastewater treatment. Background technique [0002] Flocculation technology is a commonly used method at home and abroad to improve the efficiency of water quality treatment. It is mainly used to remove colloids and suspended solids in wastewater, including inorganic and organic substances, as well as some soluble impurities. The core of flocculation technology is flocculants. At present, commonly used flocculants are mainly inorganic flocculants (iron salts, aluminum salts and their polymers) and organic synthetic flocculants (polyacrylamide and their derivatives). With the development of technology, the amount of wastewater discharge and sludge generation has gradually increased. In order to achieve the discharge of was...

AI Technical Summary

Problems solved by technology

Chinese patent CN1844360A discloses a method for preparing a microbial flocculant by using bean dregs, but does not investigate the flocculation performance of the microbial flocculant

In addition, the lack of pertinence in the use of microbial flocculants leads to a large amount of use, and it is difficult to improve the efficiency of wastewater treatment

For example: the COD removal efficiency of the microbial flocculant prepared by Gao Yiwen to the wastewater with a COD concentration of 835.42mg / L is only 20%