Deep dehydration technique of Vc two-step fermentation ultrafiltration waste slag liquid

Abstract

The invention discloses a deep dehydration technique of Vc two-step fermentation ultrafiltration waste slag liquid. Ultrafiltration raffinate with 3-5 g / 100ml of contained slag concentration and 70-120 mg / ml of gulonic acid concentration is used for regulating pH within 2-4, is stood for 20 minutes, is heated to 70-90 DEG C for keeping 20-30 minutes, is cooled to the room temperature, and is centrifugated for 10-15 minutes with 1500 rpm; supernate is shifted into originally ultrafiltered filtrate and participated in following techniques with the same; precipitate is centrifuged to form cake-shaped sediment, has 80%-84% of water content, and is dried to prepare feed protein; the protein content is 35%-55%. The deep dehydration technique is adopted to reduce 75% of emission of the ultrafiltration waste slag liquid; the water content of the ultrafiltration waste slag liquid is decreased from 95% to 80%, so that the preparation of the feed protein is guaranteed; the deep dehydration technique can shorten 30% of an ultrafiltration period, and can improve equipment utilization rate by 20%.

Description

technical field [0001] The invention relates to a deep dehydration technology of Vc two-step fermentation ultrafiltration waste liquid, specifically a process for fully concentrating the ultrafiltration waste liquid by adjusting the operating conditions in the final stage of ultrafiltration. Background technique [0002] According to the current production process of Vc two-step fermentation and ultrafiltration dehydration, the Vc fermentation mash needs to be ultrafiltered out of gulong acid with an ultrafiltration membrane with a molecular weight cut-off of 3 to 100,000 Daltons. The initial speed of ultrafiltration is very fast, with an area of ​​1500m 2 When 300 tons of mash is ultrafiltered by an ultrafiltration membrane with a molecular weight cut-off of 100,000 Daltons, 270 tons can be filtered out in 4 to 5 hours. However, as the amount of bacteria and residues accumulated in the ultrafiltration increases, the filtration rate gradually slows down. When the ultrafiltr...

AI Technical Summary

Problems solved by technology

However, after adding water, the colloidal properties of the tail liquid also changed, and the ultrafiltration speed was not greatly improved, and the area used was 400m 2 The membrane supercharges the 60 tons of tail liquid to the remaining 30-35 tons of filtrate, which takes 6-8 hours

At this time, the 30-35 tons of residual liquid can no longer be ultra-filtered, and it is called ultra-filtered waste liquid, which is directly discharged. Its water content is greater than 95%, and it is a fluid liquid with high viscosity. It is difficult to concentrate again. or use increased difficulty