Method for producing organic fertilizer from soybean whey wastewater

Abstract

A method for producing organic fertilizer from soybean whey wastewater comprises steps as follows: after neutral salt is added to the soybean whey wastewater, the pH is adjusted to 4.0-5.8; (2) a wastewater liquor obtained in the step (1) is concentrated until the concentration is 30%-60%, and a concentrated liquor is obtained; (3) bacterial powder is added to the concentrated liquor obtained in the step (2), the obtained mixture is mixed with green manure plants, fermentation is performed, and the organic fertilizer is obtained. By means of the method, the problem about whey wastewater is solved, the whey wastewater is converted into the organic fertilizer, zero emission of sewage is realized, and besides, water resources are recycled.

Description

technical field [0001] The invention belongs to the technical field of organic fertilizers, and relates to a method for producing organic fertilizers from soybean whey wastewater, in particular to a method for producing organic fertilizers using whey wastewater produced by soybean protein isolate or acid concentrated protein production. Background technique [0002] Soybean Protein Isolate is a full-price protein food additive produced from low-temperature desolvated soybean meal. The protein content of soybean protein isolate is more than 90%, there are nearly 20 types of amino acids, and it contains essential amino acids for human body. It is rich in nutrition and does not contain cholesterol. It is one of the few varieties of vegetable protein that can replace animal protein. In recent years, soybean protein isolate has developed rapidly, especially in the two years from 2015 to 2016, the production and sales volume of soybean protein isolate reached 300,000-500,000 tons,...

AI Technical Summary

Problems solved by technology

The main components contained in clear night are inorganic salts, oligosaccharides and small molecule whey protein. The molecular weight of whey protein is between 200-13000 Daltons, and the molecular weight distribution is extremely uneven, and whey protein is viscous and aggregated. For proteins with high density, ultrafiltration and nanofiltration cannot effectively solve the problem of protein blocking the membrane pores, resulting in a rapid decrease in membrane flux, slow concentration, and low efficiency. A large amount of alkaline water and acid water are required for cleaning, causing pollution. It cannot fundamentally solve the problem of rational utilization of whey protein, and the water content of soybean whey is only between 2.3-2.8%. The processing capacity is large, the input is high, the maintenance is difficult, and it is not suitable for large-scale industrial production.

In addition, after passing through the microwave, vacuum drying is required, which consumes a lot of energy, high investment in industrial production, high operating costs, and low production efficiency.