A kind of soybean protein whey wastewater pretreatment method

Abstract

The invention discloses a method for preprocessing soybean protein whey waste water. The method comprises the following steps: 1000-2000ppm of polymeric ferric sulfate and 10-20ppm of anion amide are added to the soybean protein whey waste water, after the polymeric ferric sulfate, the anion amide and the soybean protein whey waste water are mixed to be uniform, the polymeric ferric sulfate, the anion amide and the soybean protein whey waste water which are mixed to be uniform enter an air flotation machine 1 for air flotation, a solid phase 1 enters a scum pond, and a liquid phase 1 enters a regulation pond 1; calcium hydroxide turbid liquid is added to clear liquid in the regulation pond 1, after the pH is regulated to 6.0-7.0, 1000-2000ppm of polymeric ferric sulfate and 10-20ppm of anion amide are successively added, after the polymeric ferric sulfate, the anion amide, the clear liquid and the calcium hydroxide turbid liquid are uniformly mixed, the polymeric ferric sulfate, the anion amide, the clear liquid and the calcium hydroxide turbid liquid which are mixed to be uniform enter an air flotation machine 2 for air flotation, a solid phase 2 enters a scum pond, and a liquid phase 2 enters an anaerobic regulation pond; a calcium hydroxide solution is added to the solid phase mixture obtained through the air flotation 1 and the air flotation 2, the pH is regulated to higher than 10.0, then 20-40ppm of anion amide is added, after the anion amide, the solid phase mixture and the calcium hydroxide solution are mixed to be uniform, the anion amide, the solid phase mixture and the calcium hydroxide solution which are mixed to be uniform enter a screw folding machine for dehydration, a liquid phase 3 enters the regulation pond 1, and a solid phase 3 is used for other purposes.

Description

technical field [0001] The invention relates to a treatment method of wastewater, more precisely, relates to a treatment method of soybean protein whey wastewater. Background technique [0002] During the production of soybean protein isolate and soybean protein concentrate, a large amount of acidic whey wastewater will be generated. Whey contains a large amount of protein, sugar and other organic matter and a small amount of inorganic salt. Whey wastewater is characterized by high organic matter content, low pH and acidity, high protein content, easy acidification, and strong biodegradability. [0003] Most soybean protein production enterprises adopt biochemical treatment process combining anaerobic and aerobic treatment for whey wastewater. The pretreatment effect of whey wastewater directly affects the effect of anaerobic and aerobic treatment. The current pretreatment process has a low COD removal rate. , The SS of the effluent is high, and the polyaluminum flocculant ...

AI Technical Summary

Problems solved by technology

[0003] Most soybean protein production enterprises adopt biochemical treatment process combining anaerobic and aerobic treatment for whey wastewater. The pretreatment effect of whey wastewater directly affects the effect of anaerobic and aerobic treatment. The current pretreatment process has a low COD removal rate. , the SS of the effluent is high, and the flocculant polyaluminum causes a series of problems such as residual aluminum ions, equipment corrosion, and high unit treatment cost, which not only increases the operating cost of the enterprise, but also causes high anaerobic and aerobic process loads and low treatment efficiency

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