A kind of microbial flocculant, preparation method and application thereof

Abstract

The invention discloses a method and application of preparing microbial flocculant by using sweet potato processing wastewater, including directly implanting flocculation microorganisms into a fermentation medium prepared with sweet potato processing wastewater, supplementing phosphate and sweet potato processing wastewater at a specific time during the fermentation process, The fermentation broth is obtained by fermentation; the microbial flocculant is extracted by rotary evaporation and ice bath acetone; the prepared microbial flocculant is applied to the treatment of sweet potato processing wastewater and sludge dehydration treatment, and the microbial flocculant is added in stages during the treatment to reduce microbial flocculation. The removal efficiency of COD and SS is improved while reducing the dosage of the agent; the preparation method and extraction process of the present invention are simple and convenient, the fermentation time is short, and the preparation cost of the microbial flocculant is greatly reduced. The prepared microbial flocculant has a wide application range, a flocculation activity of over 96.5%, a good removal effect on COD, SS, 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] A large amount of waste water is discharged in the process of sweet potato processing and production of starch, which belongs to high-concentration organic waste water. The concentration of COD is as high as 5000 mg / L, and the concentration of SS is as high as 1000 mg / L. At present, my country produces about 20 million m3 of this kind of waste water every year. 3 , the high concentration of organic matter in the wastewater enters the water body and quickly consumes the dissolved oxygen in the water body, resulting in the lack of oxygen in the water body. The high concentration of SS in the wastewater is easy to generate stench in an anaerobic environment and deteriorate t...

AI Technical Summary

Problems solved by technology

Although microbial flocculants have their outstanding advantages, due to the high cost of traditional medium materials and the low synthesis efficiency of microbial flocculants, the cost of microbial flocculant preparation remains high. Most research is still in the laboratory research and development stage. Based on this, In order to reduce the preparation cost of microbial flocculants, scholars at home and abroad have selected monosodium glutamate wastewater, soy sauce wastewater, etc. as the medium, but the effect is still unsatisfactory.

So far, microbial flocculants have not been popularized and applied, and the cumbersome cultivation process, long fermentation cycle, and high preparation cost are the main reasons why it is difficult to popularize