Rapid separation device and method for protein and starch in wastewater produced during starch processing

Abstract

The invention discloses a rapid separation device for protein and starch in wastewater produced during starch processing. The rapid separation device comprises a separation device body, a starch collecting device, a foaming device and a skimming device, wherein the separation device body comprises a cylinder section and an inverted cone section; the top end of the cylindrical section is open, anda feed port is formed in the side wall of the cylindrical section; the feeding port is tangentially formed relative to the inner wall of the cylindrical section; the inverted cone section is connectedto the bottom end of the cylindrical section and is provided with a liquid discharge pipe; the starch collecting device communicates with the bottom end of the inverted cone section; the foaming device is mounted in the separation device body; and the skimming device is arranged at the top of the separation device body. The invention also discloses a corresponding separation method. According tothe device and the method in the invention, protein and starch can be separated from the wastewater produced during starch processing at the same time, low-cost resource utilization of the wastewaterproduced during starch processing is achieved, and the requirement for large daily treatment capacity of the wastewater produced during starch processing can be met; and operation is simple and rapid,conditions are mild, complex equipment is not needed, and high-quality starch and protein can be obtained.

Description

technical field [0001] The invention relates to the technical field of production waste recycling, and more specifically relates to a device and a method for rapidly separating protein and starch in waste water in a starch processing process. Background technique [0002] The processing of sweet potato, cereal and bean starch consumes a lot of water, resulting in a large amount of wastewater discharge, and the wastewater is a high-concentration acidic organic wastewater, which is one of the most polluted wastewater in the food industry. At present, the anaerobic-aerobic combined biological treatment method is generally used to treat starch processing wastewater at home and abroad. Other treatment technologies include electrocoagulation, electrochemical method, Fenton-anaerobic method, etc., but these technologies are faced with high investment costs, The problem of high operating costs. Therefore, how to recycle wastewater from starch processing and reduce treatment costs h...

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Problems solved by technology

[0005] There are many factors affecting the foam separation method, and it is usually necessary to add a surfactant to promote protein foaming, while the residual surfactant will affect the later application of the protein; the ultrafiltration method can achieve fractional recovery, high yield, and easy to scale up, but the membrane module Expensive, membrane fouling problem is serious; acid precipitation method makes protein at isoelectric point by adding cheap inorganic acid and tends to aggregate and precipitate, during which protein is partially denatured, and product quality is low; coagulation method is to change the surface of colloidal protein by adding chemical agents characteristics, make the dispersed colloidal particles gather to form large particles and settle (or float), which has strong recovery ability, stable effect, strong hydraulic load resistance, simple process and low operating cost, but the flocculant will be brought into the protein product, so that The quality of the product is reduced; the fermentation method uses the waste water from the starch processing process as the raw material to cultivate microorganisms to obtain bacterial protein, which is costly and takes a long time, and it is difficult to cultivate microorganisms in acidic waste water, and a variety of nutrients need to be added

[0006] At present, for the treatment of wastewater in the starch processing process, the starch is generally recycled first, and then the protein is extracted from the wastewater. The recovery period is long and the floor area is large. The harvested starch contains a large amount of protein, which needs to be separated before it can be used. ; Due to the long time spent in starch recovery, long-term acidic environment can easily cause protein denaturation and reduce the quality of protein

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