Method for preparing fermention medium, and producing biological pesticide by using wastewater from fermentation

Abstract

This invention relates to a method for preparing fermentation culture medium and producing biological pesticide from fermentation wastewater. The method comprises: (1) utilizing fermentation liquid, ethanol wastewater and monosodium glutamate wastewater as the raw materials, and Streptomyces griseus as the strain; (2) fermenting at 28 deg.C and 100-150 rpm for 7-10 days; (3) filtering, concentrating and purifying to obtain biological pesticide. The method utilizes fermentation wastewater to prepare fermentation culture medium and produce biological pesticide, thus can effectively combine the treatment of fermentation wastewater and utilization of useful resources in fermentation wastewater. The treatment rate is high and the cost is low. Besides, the method for produing biological pesticide has such advantages as simple process, low cost, high productivity, and low probability of culture medium pollution and good antibacterial effect of the biological pesticide.

Description

technical field [0001] The invention belongs to the technical field of microbial wastewater treatment, in particular to a method for preparing a fermentation medium and producing biological pesticides by using fermentation wastewater. Background technique [0002] At present, most of industrial and agricultural fermentation wastewater in our country, such as biogas slurry, beer wastewater, and monosodium glutamate wastewater, have not been properly utilized, which not only wastes resources, but also pollutes the environment. For example, biogas slurry, due to its low nutrient content, is often used in a large amount when used as a fertilizer for crops, and the effect is poor. Therefore, farmers are reluctant to use biogas slurry as fertilizer and discharge it everywhere, which has become one of the important sources of rural environmental pollution. It is expensive and difficult to process. However, the biogas slurry still contains high nutrients...

AI Technical Summary

Problems solved by technology

At present, there is no perfect treatment technology in the world. In our country, most of them are directly discharged into rivers, causing extremely serious environmental pollution and wasting precious resources.

Using yeast fermentation to treat monosodium glutamate wastewater to produce feed protein can turn waste into treasure, but the investment is large and the cost is high, and the treatment still does not meet the requirements

Abroad also use concentrated first isoelectric point extraction process to conduct evaporation and concentration treatment of monosodium glutamate wastewater. Because the evaporation and concentration process consumes a lot of energy, this method is not suitable for my country's national conditions.