Lysine fermentation waste water processing method, and method for preparing citric acid through fermentation

A technology of lysine fermentation and treatment method, which is applied in the field of fermenting citric acid, and can solve problems such as difficulty in treating high-concentration wastewater

Inactive Publication Date: 2012-03-28
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of difficult treatment of high-concentration wastewater in lysine production, and at the same time improve the level of citric acid fermentation, to provide a new treatment method for lysine fermentation wastewater and a method for citric acid fermentation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 1) At a temperature of 60°C, the lysine fermentation wastewater (protein content is 0.3% by weight, sulfate ion content is 2% by weight, ammonium ion content is 0.3% by weight) is pumped into G17 activated carbon (commercially purchased in Guangzhou Jinlin Environmental Protection Technology Co., Ltd., the same below) bed, the volumetric space velocity of the pump is 0.8m 3 / (m 3 h). The lysine fermentation wastewater that passed through the G17 activated carbon bed was separated into 1.6m 3 / (m 3 The volume space velocity of h) is introduced into the bed layer of D318 macroporous weakly basic acrylic anion exchange resin (commercially purchased from Suqing Water Treatment Engineering Group Co., Ltd., with an exchange capacity of 6.5mmol / g (dry)). Obtain the lysine fermentation wastewater after anion exchange (hereinafter referred to as the treated lysine fermentation wastewater), the protein content in the treated lysine fermentation wastewater is 0.35% by weight, a...

Embodiment 2

[0074] 1) At a temperature of 60°C, pump lysine fermentation waste water (with a protein content of 0.5% by weight, a sulfate ion content of 5% by weight, and an ammonium ion content of 1.0% by weight) into the G17 activated carbon bed, and pump it into Volumetric airspeed is 0.8m 3 / (m 3 h). The lysine fermentation waste water that passed through the G17 activated carbon bed was 2.1m 3 / (m 3 The volume space velocity of h) is introduced into the bed layer of D818 macroporous weakly basic styrene-based anion exchange resin (commercially purchased from Jiangsu Suqing Water Treatment Engineering Group Co., Ltd., with an exchange capacity of 6.5mmol / g (dry)). Obtain the lysine fermentation wastewater after anion exchange (hereinafter referred to as the lysine fermentation wastewater after treatment), the protein content in the lysine fermentation wastewater after the treatment is 0.55% by weight, the sulfate ion content is 0.03% by weight %, ammonium ion content is 1.1% by we...

Embodiment 3

[0081] 1) At a temperature of 60°C, pump lysine fermentation waste water (with a protein content of 0.7% by weight, a sulfate ion content of 6% by weight, and an ammonium ion content of 2.0% by weight) into the G17 activated carbon bed, pumped into Volumetric airspeed is 0.8m 3 / (m 3 h). The lysine fermentation waste water that passed through the G17 activated carbon bed was 3 / (m 3 The volume space velocity of h) is introduced into the bed layer of 330 macroporous weakly basic epoxy-based anion exchange resin (commercially purchased from Bengbu Tianxing Resin Co., Ltd., with an exchange capacity of 9 mmol / g (dry)). Obtain the lysine fermentation wastewater after anion exchange (hereinafter referred to as the lysine fermentation wastewater after treatment), the protein content in the lysine fermentation wastewater after the treatment is 0.7% by weight, the sulfate ion content is 0.04% by weight %, ammonium ion content is 2.1% by weight;

[0082] 2) The treated lysine ferm...

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Abstract

The invention provides a lysine fermentation waste water processing method. The method comprises steps that: lysine fermentation waste water contacts anion exchange resin, such that a contact liquid is obtained; with a contacting condition, the sulfate ion content in the contact liquid is lower than 0.05wt%; the obtained contact liquid is mixed with lysine wet sugar manufacturing waste water, such that the ammonium ion content in the obtained mixed liquid is 0.01-0.1wt%, and the protein content in the mixed liquid is 0.1-1.0wt%; the obtained mixed solution contacts a crushed starchiness material under the existence of amylase, such that an enzymolysis product is obtained. The invention also provides a method for preparing citric acid. According to the method, the enzymolysis product is adopted as a culture medium. With the methods provided by the invention, circular utilization of the lysine waste water is improved, waste water processing cost is effectively reduced, water adopted in citric acid production is saved, citric acid fermentation level is improved, and citric acid production cost is reduced.

Description

technical field [0001] The invention relates to a treatment method for lysine fermentation wastewater and a method for producing citric acid by fermentation. Background technique [0002] The raw material pretreatment of lysine enterprises adopts the wet process. In the wet process of sugar production, there are a large amount of protein washing water, filter cloth washing water, etc., collectively referred to as lysine wet process water (hereinafter also referred to as lysine wet process sugar wastewater). Lysine wet process water contains rich protein and a small amount of starch starch, and also contains calcium ions, magnesium ions and phosphorus. Lysine fermentation wastewater refers to the waste liquid after removing bacteria and extracting lysine from the lysine fermentation liquid. It is a high-concentration waste liquid with high COD, BOD, SOD and NH 4 + The characteristics of high concentration. [0003] Since lysine fermentation wastewater contains a large amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C12P7/48
Inventor 周勇熊结青卢宗梅张继学杨儒文
Owner COFCO BIOTECHNOLOGY CO LTD
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