Wastewater treatment of soybean processing


Everyone knows that a large amount of water is required in the processing of soy products, so it is inevitable that sewage will be generated. Therefore, how to treat sewage has become a difficult problem for soy product processing enterprises to face.
During the processing of soy products, a large amount of organic wastewater is generated, which is mainly divided into three parts: soaking water, production cleaning water, and yellow slurry water. Overall, the amount of wastewater discharged is large, with high organic matter concentration, complex composition, and relatively high COD. In addition, the amount of wastewater generated during the processing of soy products may vary depending on the size of the enterprise.
According to customer requirements, this design adopts the air flotation method. The air flotation process uses tiny bubbles as carriers to adhere and remove small oils and suspended solids from wastewater, achieving preliminary purification of water quality, creating favorable conditions for subsequent biochemical treatment units, and reducing the treatment load of subsequent biochemical stages. The pollutants in sewage are divided into dissolved organic matter and insoluble substances (SS). Under certain conditions, dissolved organic matter can be converted into non soluble substances. One of the methods of sewage treatment is to add coagulants and flocculants to convert most of the dissolved organic matter into non soluble substances, and then remove all or most of the non soluble substances (SS) to achieve the goal of purifying sewage, The main method for removing SS is to use air flotation. After the dosing reaction, the wastewater enters the mixing zone of the air flotation system and comes into contact with the released dissolved water, causing the flocs to adhere to fine bubbles before entering the air flotation zone. Under the action of air buoyancy, the flocs float towards the water surface to form scum. The clean water in the lower layer flows to the clean water tank through a water collector, and a part of it flows back for dissolved gas use. The remaining clean water flows out through the overflow port. After the floating slag on the water surface of the air flotation tank accumulates to a certain thickness, it is scraped into the air flotation sludge tank by a foam scraper and discharged.


Post time: Mar-08-2024