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Treatment method of wastewater generated during citric acid preparation and preparation method of citric acid

A treatment method and technology of citric acid, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, osmotic/dialysis water/sewage treatment, etc. The effect of reducing grain consumption, reducing environmental protection treatment costs, and reducing environmental protection treatment costs

Inactive Publication Date: 2011-10-19
COFCO BIOTECHNOLOGY CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the discharge of waste water produced by citric acid production in the prior art will not only cause waste of hydraulic resources but also cause harm to the environment, and provide a treatment method for preparing waste water produced by citric acid and a lemon A method for preparing acid, the treatment method can improve the recycling efficiency of waste water produced by preparing citric acid, effectively reduce the water consumption of raw water, save energy and reduce emissions, and reduce the production cost of citric acid, and reuse the treated waste water for The preparation of citric acid can reduce the discharge of waste water, reduce the pressure on environmental protection, and reduce the cost of environmental protection treatment; because the nutrients in the reused waste water have also been utilized, it will not affect the acid production rate of citric acid, and even help the production of citric acid. increase in acidity

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  • Treatment method of wastewater generated during citric acid preparation and preparation method of citric acid

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[0010] The method for treating the waste water produced by the preparation of citric acid provided by the present invention comprises carrying out membrane filtration of the waste water, the waste water contains citric acid, heteroacids, organic pigments, calcium salts and fermentation residues, wherein the method comprises carrying out the waste water Membrane filtration, the pore size of the membrane is 0.1-0.6 μm.

[0011] According to the present invention, the waste water produced by the preparation of citric acid can be produced by various methods, such as calcium salt method, sulfuric acid acid hydrolysis method, extraction method, electrodialysis method, ion exchange method and chromatography, etc., Considering the components of the wastewater, the method provided by the invention is more suitable for treating the wastewater produced by extracting citric acid through the calcium salt method.

[0012] According to the present invention, the wastewater generated from the...

Embodiment 1

[0051] This embodiment is used to illustrate the treatment method for the wastewater produced by the preparation of citric acid provided by the present invention.

[0052] 50L of the waste water produced by the above-mentioned preparation of citric acid is directly sent into the membrane treatment equipment with a centrifugal pump for membrane filtration, and the flow rate of the waste water is 650 L / h until it is finished. The temperature of the membrane filtration is 63° C., and the pressure is 0.4 MPa. In order to prevent the membrane pores from being blocked by particulate matter, after filtration, the filter membrane is cleaned with compressed air, and the air flow rate is 0.2m 3 / s, the backwash pressure is 0.1MPa, and the backwash time is 25s.

[0053] The indicators of the treated wastewater are shown in Table 1.

Embodiment 2

[0055] This embodiment is used to illustrate the treatment method for the wastewater produced by the preparation of citric acid provided by the present invention.

[0056] 50L of the waste water produced by the above-mentioned preparation of citric acid is directly sent into the membrane treatment equipment with a centrifugal pump for membrane filtration, and the flow rate of the waste water is 680 L / h until it is finished. The temperature of the membrane filtration is 65° C., and the pressure is 0.45 MPa. In order to prevent the membrane pores from being blocked by particulate matter, after filtration, the filter membrane is cleaned with compressed air, and the air flow rate is 0.3m 3 / s, the backwash pressure is 0.1MPa, and the backwash time is 30s.

[0057] The indicators of the treated wastewater are shown in Table 1.

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Abstract

The invention provides a treatment method of wastewater generated during citric acid preparation, wherein the wastewater contains citric acid, mixed acids, organic pigments, calcium salts and fermentation residues, and the treatment method comprises the step of carrying out membrane filtration on the wastewater, wherein the membrane has a pore size of 0.1-0.6 mu m. Using the treatment method of wastewater generated during citric acid preparation provided by the invention can improve the recycling efficiency of wastewater, effectively reduce the consumption of raw water, facilitate energy conservation and emission reduction and reduce the production cost of citric acid; and the treatment method is simple and easy for industrial production.

Description

technical field [0001] The invention relates to a method for treating waste water produced by preparing citric acid and a method for preparing citric acid. Background technique [0002] Citric acid is the largest acid among organic acids. Due to its superior properties in physics, chemistry, and derivatives, it has a wide range of uses. It is mainly used in the food industry, pharmaceutical industry, and chemical industry. It is also used in electronics, textiles, petroleum, leather, Industrial fields such as architecture, photography, plastics, foundry and ceramics also have a very wide range of applications. [0003] In the prior art, methods for extracting citric acid from citric acid fermentation broth mainly include calcium salt method, sulfuric acid hydrolysis method, extraction method, electrodialysis method, ion exchange method, chromatography and other methods. The high-concentration wastewater produced in the production process of citric acid is mainly from the ne...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F9/04C12P7/48
Inventor 卢宗梅邵引刚章辉平吴晓艳
Owner COFCO BIOTECHNOLOGY CO LTD
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