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Method for treating papermaking black liquor with composite coagulation method

A technology of papermaking black liquor and coagulant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve the effect of insignificant overcoming effect, convenient operation and reduction of acid dosage

Inactive Publication Date: 2012-07-04
NANJING UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0010] Another object of the present invention is to provide a method for purifying papermaking black liquor by using a high-efficiency composite coagulant, in order to solve or alleviate the water pollution problem caused by papermaking black liquor

Method used

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  • Method for treating papermaking black liquor with composite coagulation method
  • Method for treating papermaking black liquor with composite coagulation method
  • Method for treating papermaking black liquor with composite coagulation method

Examples

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Embodiment 1

[0039] Take multiple 200mL papermaking black liquor, and adjust its pH to about 6 with (1+5) sulfuric acid.

[0040] Mix ferric sulfate solution, aluminum sulfate solution, polyaluminum ferric chloride solution, and aluminum potassium sulfate solution in a volume ratio of 1:0.4:1.4:1.4 to form a brick red suspension, respectively taking 0, 0.2, 0.4, 0.6, and 0.8 , 1.0, 1.5, 2.0, 3.0, 4.0, 5.0mL suspension, add different 200mL papermaking black liquor, first stir rapidly at 160rpm / min for 3min, then slowly stir at 60rpm / min for 10min , and finally filtered after static precipitation for 30 min. From the COD and chromaticity change curves, it can be seen that when the pH=6 and the dosage of the compound solution is 4mL / 200mL black liquor, the treatment effect is the best. At this time, COD=533mg / L, and the chromaticity is 483 times.

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Abstract

The invention provides a method for treating papermaking black liquor with a composite coagulation method, the pH of the papermaking black liquor is firstly regulated to 5-6.5, a composite coagulant is then added and stirred to react, and after the reaction, standing, sedimenting and filtering are carried out. The composite coagulant is turbid liquid which is formed by mixing ferric sulphate solution, aluminum sulfate solution and polymeric aluminium ferric chloride solution with aluminium potassium sulfate solution according to the volume ratio of 1:(0.3-0.5):(0.9-1.1):(0.4-0.6), the mass concentrations of the ferric sulphate solution, the aluminum sulfate solution and the polymeric aluminium ferric chloride solution are in a range of 15%-25%, and the mass concentration of the aluminium potassium sulfate solution is in a range of 5%-10%. The usage of the efficient composite coagulant is small, and the papermaking black liquor can be effectively purified, so the problem of an unobvious effect of a single coagulant is solved; the acid usage and the alkali usage when the pH is regulated back are effectively reduced; and the method has a simple compound process, is convenient to operate and dose not need to consider the dissolving problem of various coagulants.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a compound coagulant for treating papermaking black liquor and a method for treating papermaking black liquor by using a compound coagulation method. Background technique [0002] The paper industry is a major water polluter in my country, especially the black liquor discharged by it is the most serious water pollution. Black liquor contains two types of substances: organic matter and inorganic matter. The organic matter is mainly alkali lignin, hemicellulose and cellulose degradation products; most of the inorganic matter is various sodium salts, such as sodium sulfate, sodium carbonate, and silicic acid. Sodium, and NaOH, Na 2 S. Due to the continuous discharge of papermaking black liquor for a long time, it has far exceeded the natural purification capacity of the water. Therefore, the treatment of papermaking black liquor is imperative. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 孙亚兵徐建华边琳张艳
Owner NANJING UNIV
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