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Method for promoting sludge dewatering through coupling of ferrous iron induced calcium peroxide and polymeric flocculant

A technology of polymer flocculant and calcium peroxide, which is applied in the direction of oxidation treatment of sludge, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of slow dehydration rate and limited degree of reduction, and achieve dehydration , obvious social and environmental benefits

Inactive Publication Date: 2020-10-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the classical Fenton method requires the use of a large amount of highly oxidizing hazardous substance H 2 o 2 ; In addition, although the Fenton reaction can reduce the water content of the sludge, the degree of reduction is limited, and the dehydration rate is slower than that of the organic polymer flocculant

Method used

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  • Method for promoting sludge dewatering through coupling of ferrous iron induced calcium peroxide and polymeric flocculant
  • Method for promoting sludge dewatering through coupling of ferrous iron induced calcium peroxide and polymeric flocculant
  • Method for promoting sludge dewatering through coupling of ferrous iron induced calcium peroxide and polymeric flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Effect of different concentrations of ferrous iron on sludge dewatering performance

[0026] (Why there is no step of adding flocculant in the example)

[0027] Measure 100mL of activated sludge solution with a solid content of 15g / L and place them in a 250mL beaker, adjust the pH value of the sludge solution to 2.0 with a concentration of 1mol / L sulfuric acid, and then stir the reaction for 10min under the action of a magnetic stirrer , the stirring speed is 200r / min. Adding different doses of FeSO to the sludge solution in turn 4 ·7H 2 O and a fixed dose of CaO 2 , stirred for 30 minutes, and the stirring speed was 200 r / min. Finally, the conventional Buchner funnel test was used to measure the sludge specific resistance (SRF) and sludge water content to evaluate the sludge dewatering efficiency. FeSO 4 ·7H 2 The addition of O is respectively 0, 20, 40, 60, 120, 200 and 400 mg / g suspended solids based on the solid content of the activated sludge; CaO...

Embodiment 2

[0028] Example 2: Effect of pH value of sludge solution on sludge dewatering performance

[0029]Measure 100mL of activated sludge solution with a solid content of 15g / L and put them in a 250mL beaker, adjust the pH value of the sludge solution to 2.0, 3.0, 4.0, 5.0 and 6.0 with sulfuric acid at a concentration of 0~1mol / L , and then stirred and reacted for 10 min under the action of a magnetic stirrer, and the stirring speed was 200 r / min. A fixed dose of FeSO was sequentially added to the sludge solution 4 ·7H 2 O and CaO 2 , stirred for 30 minutes, and the stirring speed was 200 r / min. Finally, the sludge specific resistivity (SRF) and sludge water content were measured by conventional Buchner funneltest method to evaluate the sludge dewatering efficiency. FeSO 4 ·7H 2 The amount of O added is 120 mg / g suspended solids based on the activated sludge solids content; CaO 2 The added amount is 30 mg / g suspended solids based on the activated sludge solids content. figur...

Embodiment 3

[0030] Embodiment 3: the influence of calcium peroxide of different concentrations on sludge dewatering performance

[0031] Measure 100mL of activated sludge solution with a solid content of 15g / L and place them in a 250mL beaker, adjust the pH value of the sludge solution to 2.0 with a concentration of 1mol / L sulfuric acid, and then stir the reaction for 10min under the action of a magnetic stirrer , the stirring speed is 200r / min. Add different doses of CaO to the sludge solution in sequence 2 and a fixed dose of FeSO 4 ·7H 2 O, stirring and reacting for 30min, the stirring speed was 200r / min. Finally, the conventional Buchner funnel test was used to measure the sludge specific resistance (SRF) and sludge water content to evaluate the sludge dewatering efficiency. The CaO 2 The addition amount is respectively 0, 12.5, 25, 37.5, 50, 62.5 and 125 mg / g suspended solids based on the solid content of the activated sludge; 4 ·7H 2 The amount of O added is 40 mg / g suspended...

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Abstract

The invention discloses a method for promoting sludge dewatering through coupling of divalent iron induced calcium peroxide and a polymeric flocculant. The method comprises the following steps: 1) weighing an activated sludge solution, dropwise adding sulfuric acid to adjust the pH value of the activated sludge solution to 2.0, and carrying out a stirring reaction for 5-15 min at a stirring speedof 100-300 r / min under the action of a magnetic stirrer; 2) sequentially adding CaO2 and FeSO4.7H2O into the sludge solution, and continuing stirring and reacting for 25-35 minutes at the stirring speed of 100-300r / min so as to obtain a mixed solution; and 3) adding the polymeric flocculant into the mixed solution, and conducting quick stirring for a reaction for 1 minute to complete the process of sludge dewatering. According to the method disclosed by the invention, the divalent iron induced calcium peroxide is coupled with the polymeric flocculant to form a composite regulator, so deeper dewatering of the activated sludge is realized, and problems in dewatering of residual activated sludge of a sewage treatment plant is solved.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a method in which divalent iron induces calcium peroxide coupled with a polymer flocculant to promote sludge dehydration. Background technique [0002] The activated sludge method is the main technical means of water pollution control. With the generation of a large amount of urban sewage, the output of surplus activated sludge increases sharply. If the remaining sludge cannot be effectively disposed of, it will pose a great threat to the ecosystem. The traditional sludge treatment method is expensive, accounting for the vast majority of the operating cost of the entire sewage treatment plant, and the treatment effect is not good. The moisture content of the original activated sludge is about 99%, and the moisture content of the sludge after the traditional conditioning method is still as high as 80%. So at present, the treatment and disposal of excess slud...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148C02F11/06
CPCC02F11/148C02F11/06
Inventor 何东芹包波陈敬仪李军邹金特吴淑云刘文龙
Owner ZHEJIANG UNIV OF TECH
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