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
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[0010] The method for treating wastewater produced by the preparation of citric acid provided by the present invention includes membrane filtration of the wastewater. The wastewater contains citric acid, miscellaneous acids, organic pigments, calcium salts, and fermentation residues, wherein the method includes subjecting the wastewater to 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 preparing citric acid may be waste water produced by preparing citric acid by various methods, for example, calcium salt method, sulfuric acid hydrolysis method, extraction method, electrodialysis method, ion exchange method, chromatography method, etc., Considering the composition of wastewater, the method provided by the present invention is more suitable for treating wastewater produced by extracting citric acid by the calcium salt method.
[0012] According to the present invention, the wastewater produced...
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[0050] Example 1
[0051] This embodiment is used to illustrate the method for treating waste water produced by preparing citric acid provided by the present invention.
[0052] 50L of the waste water produced by the above preparation of citric acid is directly sent to the membrane treatment equipment by a centrifugal pump for membrane filtration, and the flow rate of the waste water is 650L / h until it is finished. The temperature of membrane filtration is 63°C and the pressure is 0.4MPa. In order to prevent the membrane pores from being blocked by particulate matter, after filtering, the membrane is cleaned with compressed air. 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.
Example Embodiment
[0054] Example 2
[0055] This embodiment is used to illustrate the method for treating waste water produced by preparing citric acid provided by the present invention.
[0056] 50L of the waste water produced by the above preparation of citric acid was directly sent to the membrane treatment equipment by a centrifugal pump for membrane filtration, and the flow rate of the waste water was 680L / h until it was finished. The temperature of membrane filtration is 65°C and the pressure is 0.45MPa. In order to prevent the membrane pores from being blocked by particulate matter, after filtering, the 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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