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Sludge treatment method by compounding ferric salt flocculant and magnesium salt flocculant

A kind of sludge treatment, flocculant technology, is used in the direction of sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, which can solve large color, large turbidity, poor use effects, poor use effects and other problems, to achieve the effect of reduced mud cake volume, large floc particles, and good dehydration performance

Inactive Publication Date: 2017-06-20
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing flocculant for sludge treatment is mostly a single iron salt flocculant, such as ferric chloride, etc. However, after treatment, it has the disadvantages of large chroma and turbidity, and the use effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add ferric sulfate (dosage is 7.5‰ of wet weight) and magnesium chloride (dosage is 5‰ of wet weight) in the 100kg sludge to be conditioned in sewage treatment plant, stir rapidly (the speed of rapid stirring is 250r / min), react 2min, then add 0.02mg / mL (that is, add 0.02mg per mL of sludge to be conditioned) cationic polyacrylamide and stir at a slow speed (50r / min at a slow speed) for 10min, and press the sludge under a pressure of 0.1MPa Filter to form a mud cake, and check the water content after the mud cake is air-dried for 72 hours. After air-drying, the diameter of the mud cake is about 60mm, the thickness is about 1.3mm, and the moisture content drops to 59.7%.

Embodiment 2

[0023] Add ferric sulfate (dosage is 7.5‰ of wet weight) and magnesium chloride (dosage is 5‰ of wet weight) in the 20kg sludge to be conditioned in sewage treatment plant and add calcium oxide as coagulant, stir quickly (quickly stir The rotation speed is 250r / min) and react for 2min, then add 0.03mg / mL cationic polyacrylamide and stir at a slow speed (50r / min) for 10min, and filter the sludge under a pressure of 0.1MPa to form a mud cake. After air-drying for 72 hours, the moisture content was tested, and the moisture content dropped to 58.9%.

[0024] Those of ordinary skill in the art will know that when specific parameters of the present invention and components are changed within the following ranges, the same or similar technical effects as those of the above-described embodiments can still be obtained:

[0025] A sludge treatment method compounded with iron salt and magnesium salt flocculant, comprising the following steps:

[0026] (1) Add iron sulfate and magnesium ...

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Abstract

The invention discloses a sludge treatment method by compounding a ferric salt flocculant and a magnesium salt flocculant. Ferric sulfate and magnesium chloride are added into sludge to be conditioned and stirred and allowed to react for 1-5 minutes, cationic polyacrylamide is added and stirred for 5-15 minutes, the sludge is subjected to pressure filtration under the pressure of 0.05-0.5MPa to form a sludge cake, and the sludge cake is subjected to air drying for 24-96 hours. The ferric salt and magnesium salt compound flocculant disclosed by the invention overcomes the defects of a single iron salt such as large chromaticity and turbidity and has the advantages that the magnesium salt can effectively reduce the turbidity and has the effect of the ferric salt, the flocculation effect is good, the floc structure is compact, the floc particles are large, the sedimentation performance is good, and the dewatering performance is good. After air drying, the water content of the sludge cake can be reduced to below 60%, and the size of the sludge cake can be effectively reduced.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge treatment method compounded with an iron salt and magnesium salt flocculant to achieve the purpose of reducing turbidity. Background technique [0002] With the acceleration of urbanization and industrialization in our country, the growing urban population and industrial and mining enterprises have produced a large amount of sewage, which has seriously polluted the urban water environment and ecological environment. my country has built a large number of urban sewage treatment plants during the "Twelfth Five-Year Plan" period. At present, most of the sludge in the country has not been stabilized and harmlessly treated. Most of the sludge is sent to urban waste treatment plants for simple filling. buried. Improper disposal of sludge and direct discharge into the environment will cause environmental pollution and waste of resources and energy. How to deal with sludge so th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14C02F11/12C02F101/20
Inventor 孙荣洪俊明罗晓洁
Owner HUAQIAO UNIVERSITY
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