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Method for preparing flocculant from chemically and physically treated sludge of papermaking waste water

A papermaking wastewater and flocculant technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve problems such as high iron content and waste of iron resources

Inactive Publication Date: 2011-06-08
SHANDONG TAIYANGZHIYE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ash content of the sludge after advanced treatment reaches 70-90%, and the iron content in the dry sludge is as high as 10-20%. The final disposal of this part of the sludge is mainly landfill, resulting in a waste of iron resources. If these It is of great significance to materialize iron in sludge and turn waste into treasure
[0004] During the advanced treatment of papermaking wastewater, the physical and chemical sludge generated by Fenton's reagent is mainly composed of ferric and ferric ions and organic pollutants in the water. It is rare to use this physical and chemical sludge to prepare iron-containing flocculants. to report

Method used

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  • Method for preparing flocculant from chemically and physically treated sludge of papermaking waste water
  • Method for preparing flocculant from chemically and physically treated sludge of papermaking waste water
  • Method for preparing flocculant from chemically and physically treated sludge of papermaking waste water

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Experimental program
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Effect test

Embodiment 1

[0015] The COD of the effluent from the secondary sedimentation tank of the pulp and paper mill is 200-350mg / l, and the pH value of the wastewater is 7-9. Add ferrous sulfate at a dosage of 0.2-0.4% of the wastewater, and then add hydrogen peroxide at a dosage of 0.02-0.04% of the amount, ferrous sulfate decomposes H by catalytic 2 o 2 The generated OH attacks organic molecules to capture hydrogen, degrades macromolecular organics into small molecular organics or mineralizes them into CO 2 and H 2 O and other inorganic substances. At the same time, the reaction of Fenton’s reagent produces ferric iron through adsorption and electrical neutralization, compressing the electric double layer of organic colloids in water to form small alum flowers, and adding polymer PAM for adsorption and bridging to precipitate SS and colloidal substances in water together , the water quality becomes clear, the supernatant is discharged to the subsequent wastewater treatment process, and the p...

Embodiment 2

[0018] The physical and chemical sludge after advanced treatment of papermaking wastewater with Fenton's reagent is added with polymer PAM in an amount of 0.2% of the dry sludge, and then dehydrated until the water content of the physical and chemical sludge is reduced to 60%. The obtained product was stirred and impregnated with 1:9 hydrochloric acid for 1h, wherein the ratio of absolute dry sludge to hydrochloric acid solution (1:9) was 1:2, the concentration of the sludge was 5%, and the filtrate after the belt filter press Used as a flocculant, the sludge after pressing is mixed with biochemical sludge for disposal, and the filtrate after the belt filter press is used as a flocculant.

Embodiment 3

[0020] The physical and chemical sludge after advanced treatment of papermaking wastewater with Fenton's reagent is added with polymer PAM in an amount of 0.2% of the absolute dry sludge, and then dehydrated until the water content of the physical and chemical sludge is reduced to 65%. The obtained product was stirred and impregnated with 1:9 hydrochloric acid for 1h, wherein the ratio of absolute dry sludge to hydrochloric acid solution (1:9) was 1:2, the concentration of the sludge was 5%, and the filtrate after the belt filter press Used as a flocculant, the sludge after pressing is mixed with biochemical sludge for disposal, and the filtrate after the belt filter press is used as a flocculant.

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Abstract

The invention discloses a method for preparing a ferrous flocculant from chemically and physically treated sludge of papermaking waste water which is deeply treated by a Fenton reagent. The method comprises the following steps: deeply treating papermaking waste water with the Fenton reagent to obtain chemically and physically treated sludge; carrying out dehydration treatment on the chemically and physically treated sludge until the water content of the chemically and physically treated sludge is dehydrated to 60-70%; stirring and dipping the obtained product for 1-3 hours in hydrochloric acid of 1:9; and filtering to obtain the filtrate which is used as the flocculant. By converting the chemically and physically treated sludge generated by deeply treating the papermaking waste water with the Fenton reagent into the useful flocculant, the invention solves the difficult problem of the final treatment of the chemically and physically treated sludge in papermaking waste water treatment plants.

Description

technical field [0001] The invention relates to the utilization of physical and chemical sludge in the process of pulping and papermaking wastewater treatment, in particular to a method for preparing an iron-containing flocculant from the physical and chemical sludge after advanced treatment of papermaking wastewater by using Fenton's reagent; the prepared flocculant can be reused for The advanced treatment process of papermaking wastewater. Background technique [0002] In recent years, in order to make the wastewater discharge up to standard, most of the papermaking enterprises have adopted the Fenton reagent advanced treatment technology. The Fenton reagent treatment of wastewater is based on the strong oxidation of hydroxyl radicals and the co-precipitation mechanism of iron salts. This technology was discovered by French scientist H.J.Fenton in 1894. In 1964, Canadian scholar H.R.Eisenhaner successfully applied Fenton's reagent to wastewater treatment. It has become the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 吴朝军乔军应广东管全红张淑侠
Owner SHANDONG TAIYANGZHIYE