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Pretreatment technique for industrial bean clear water

A pretreatment and clear water technology, which is applied in the direction of water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of affecting the biochemical treatment process, the treatment effect is not ideal, and the treatment is difficult and other problems, to achieve the effect of facilitating biochemical treatment, improving biochemical performance, and strong operability

Inactive Publication Date: 2008-08-13
胡志刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the coagulation-air flotation method is generally used to pretreat soybean clear water, but the treatment effect is not ideal, and the removal rate of SS (suspended solids), BOD (chemical oxygen demand) and COD (biochemical oxygen demand) is only It is about 50%, which still affects the follow-up biochemical treatment process, making the follow-up treatment difficult and the discharge not up to standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 500 ml of bean clear water, the pH value is determined to be 3.62, and add sodium hydroxide to adjust the pH to 7.8; while stirring, add 3 drops of polyaluminum chloride solution, and then add 5 drops of polyacrylamide solution; let it stand for 1 hour to make the bean Clarify and separate with clear water, and carry out secondary treatment on the remaining liquid after separating the precipitate: adjust the pH to 7.8 again; add 3 drops of polyaluminum chloride solution while stirring, and then add 5 drops of polyacrylamide solution; stand still for 1 hour, after separation A supernatant and a precipitate formed. The entire treatment process is carried out under normal pressure and normal temperature (15° C.).

Embodiment 2

[0026] Take 500 ml of bean clear water, the pH value is 4.5 according to the measurement, add calcium hydroxide to adjust the pH to 6.8; add 3 drops of polyaluminum chloride solution while stirring, and then add 3 drops of polyacrylamide solution; let it stand for 2 hours to make the bean Clarify and separate with clear water, and carry out secondary treatment on the remaining liquid after separating the precipitate: adjust the pH to 6.8 again; add 3 drops of polyaluminum chloride solution while stirring, and then add 3 drops of polyacrylamide solution; stand for 2 hours, after separation A supernatant and a precipitate formed. The entire treatment process is carried out under normal pressure and normal temperature (22° C.).

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Abstract

The present invention is a preprocessing technique of the industrial bean clear water, belongs to the field of the industrial sewage and is characterized in that the technique comprises the following technical procedures: when the bean clear water is adjusted with pH value, respectively adding the polyaluminium chloride solution and the polyacrylamide solution; after stewing separating the precipitate, adjusting pH of the residual solution and adding the polyaluminium chloride solution and polyacrylamide solution. The technique of the invention has the advantages of effectively eliminating the SS, BOD, COD and the like in the bean clear water with eliminating ratio higher than 88%; simple technique and excellent operability; effectively increasing the biochemical property and facilitating the subsequent biochemical treating.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a pretreatment process before biochemical treatment of industrial bean water. Background technique [0002] During the production process of soybean protein isolate powder and soybean fiber powder, the sewage produced is called bean clear water. Because bean clear water is soybean dregs, sodium metabisulfite, Sodium chloride, defoaming agent, hydrochloric acid, ammonium sulfate ion and other sundries and suspended solids (SS), the water quality is complicated, and the COD content is more than 20,000, or even 30,000. If it is directly treated by biochemical process, it will be difficult and the treatment will not meet the standard. In the prior art, the coagulation-air flotation method is generally used to pretreat soybean clear water, but the treatment effect is not ideal, and the removal rate of SS (suspended solids), BOD (chemical oxygen demand) and C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/52
Inventor 胡志刚
Owner 胡志刚
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