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Method for improving dewatering performance of dredged sediment

A technology for dredging sediment and dewatering performance, applied in chemical instruments and methods, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve flocculant residue, acrylamide poisoning, limit sediment The degree of dehydration and other issues can be reduced to reduce operating costs and improve dehydration performance

Inactive Publication Date: 2020-07-14
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, flocculation technology cannot decompose microbial extracellular polymers in dredged sediments, and cannot release sediment bound water, which limits the improvement of sediment dehydration.
In addition, the use of flocculants such as PAM will cause flocculant residues in the sediment, and its decomposition product acrylamide is toxic to humans and animals

Method used

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  • Method for improving dewatering performance of dredged sediment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for improving the dewatering performance of dredged sediment, comprising the following steps:

[0028] (1) Take the dredged sediment from a certain section of Dongting Lake, adjust the moisture content of the dredged sediment to 91%, and adjust the pH of the dredged sediment to 6.9;

[0029] (2) The pH value of the dredged bottom mud in step (1) is adjusted to 3.0 with sulfuric acid to obtain acidified dredged bottom mud;

[0030] (3) adding size to the acidified dredged bottom mud in step (2) is 650nm and accounts for the submicron iron of acidified dredged bottom mud dry weight 10%, with the speed mechanical stirring of 330r / min 3min, then with the speed of 120r / min Slow speed mechanical stirring for 8 minutes to obtain iron-containing dredged sediment;

[0031] (4) Add the hydrogen peroxide that accounts for 2.5% of iron-containing dredging bottom mud dry weight to the iron-containing dredging bottom mud in step (3), stir 6~7min with the fast speed of 360r / ...

Embodiment 2

[0034] A method for improving the dewatering performance of dredged sediment, comprising the following steps:

[0035] (1) Take the dredged sediment from a certain section of Dongting Lake, adjust the moisture content of the dredged sediment to 91%, and adjust the pH of the dredged sediment to 6.9;

[0036] (2) Adjusting the pH value of the dredged sediment in step (1) to 3.0 with sulfuric acid, and then filtering and dehydrating the acidified dredged sediment.

[0037] Detect the dehydration performance of the dredged sediment before and after the treatment, and the results are as follows: the water content of the filter cake after the dewatering of the dredged sediment before the treatment is 85.4%; The moisture content is 78.9%.

Embodiment 3

[0039] A method for improving the dewatering performance of dredged sediment, comprising the following steps:

[0040] (1) Take the dredged sediment from a certain section of Dongting Lake, adjust the moisture content of the dredged sediment to 91%, and adjust the pH of the dredged sediment to 6.9;

[0041] (2) The pH value of the dredged bottom mud in step (1) is adjusted to 3.0 with sulfuric acid to obtain acidified dredged bottom mud;

[0042] (3) adding size to the acidified dredged bottom mud in step (2) is 650nm and accounts for the submicron iron of acidified dredged bottom mud dry weight 10%, with the speed mechanical stirring of 330r / min 3min, then with the speed of 120r / min Stir at a slow speed for 8 minutes, continue to use magnets to recover the remaining submicron iron in the dredged sediment, and then filter and dewater the iron-containing dredged sediment.

[0043] Detect the dehydration performance of the dredged sediment before and after the treatment, the re...

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Abstract

The invention belongs to the technical field of dredged sediment treatment. The invention particularly relates to a method for improving the dewatering performance of dredged sediment. The method comprises the following steps: adjusting the water content of the dredged sediment, acidifying the dredged sediment, sequentially adding submicron iron and hydrogen peroxide into the acidified dredged sediment to react, recovering the submicron iron after the reaction is finished, and finally filtering and dehydrating the obtained dredged sediment. The dredged sediment is conditioned on the basis of oxidative cracking coupled with synchronous flocculation, the dewatering performance of the dredged sediment is remarkably improved, and popularization of the technology has important environmental andecological significance for treatment and disposal of the dredged sediment in China.

Description

technical field [0001] The invention relates to the technical field of dredged bottom mud treatment, in particular to a method for improving the dewatering performance of dredged bottom mud. Background technique [0002] There are many rivers and lakes in my country. In many economically developed and densely populated areas, human activities such as industrial and agricultural production have caused rivers and lakes to be polluted to varying degrees. A large number of pollutants and toxic substances are enriched in the sediment, resulting in serious pollution of the sediment. With the continuous improvement of people's requirements for environmental quality, more and more projects for the treatment of polluted water bodies, the treatment and disposal of dredged sediments are also receiving more and more attention. [0003] In recent years, the state has vigorously promoted the prevention and control of water pollution, fully implemented the requirements of the "Water Ten Me...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/143C02F11/15
CPCC02F11/00C02F11/143C02F11/15
Inventor 黎一夫王冬波杨帆
Owner HUNAN UNIV
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