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A kind of hard bottom material modifier after river or lake dredging and preparation method and use thereof

A technology for improving agent and dredging sediment, applied in chemical instruments and methods, treatment of polluted waterways/lakes/ponds/rivers, sludge treatment, etc., can solve unstable effect, cumbersome preparation method and secondary pollution and other problems, to achieve the effect of improving the fixing effect, reducing the degree of secondary pollution, and promoting growth

Active Publication Date: 2016-11-30
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the preparation method of the improver in the prior art is cumbersome, the cost is high, the effect in the environment is unstable, and secondary pollution is easy to occur, the present invention provides a hard substrate improver after dredging of rivers or lakes Its preparation method and use

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  • A kind of hard bottom material modifier after river or lake dredging and preparation method and use thereof
  • A kind of hard bottom material modifier after river or lake dredging and preparation method and use thereof
  • A kind of hard bottom material modifier after river or lake dredging and preparation method and use thereof

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Effect test

Embodiment 1

[0040] A kind of hard bottom modifier provided by the invention after dredging of rivers or lakes, its preparation method comprises the following steps:

[0041] (1) Get 50g of undisturbed calcium-based attapulgite in Xuyi County, Jiangsu, wherein the mass content of dolomite is 15%, adopt mechanical method to make particles with particle diameter of 0.25~0.6mm, and dry to constant weight at 105°C;

[0042] (2) heating the calcium-based attapulgite treated in step (1) at a temperature of 550° C. for 1 hour, cooled to room temperature, and stored in a desiccator;

[0043] (3) Take 1000 g of dredged sediment in the Feihe Lake District of Chaohu, mix with the calcium-based attapulgite treated in step (2) according to the dry weight to mass ratio of 100:5, and solidify and react for 7 days under natural environment conditions.

Embodiment 2

[0045] A kind of hard bottom modifier provided by the invention after dredging of rivers or lakes, its preparation method comprises the following steps:

[0046] (1) Take 100 g of undisturbed calcium-based sepiolite from Yixian County, Hebei Province, in which the mass content of dolomite is 20%, and use mechanical methods to make particles with a particle size of 0.25 to 0.6 mm, and dry them at 105 ° C to constant weight ;

[0047] (2) is identical with step (2) of embodiment 1;

[0048](3) Take 1000g of dredged sediment from the Feihe Lake area in Chaohu Hunan, mix it with the calcium-based sepiolite treated in step (2) at a dry weight ratio of 100:10, and cure it under natural environmental conditions for 8 days.

Embodiment 3

[0050] A kind of river course or lake dredging back hard substrate improving agent provided by the present invention, its preparation method comprises the following steps:

[0051] (1) Take 150g of undisturbed calcium-based sepiolite from Yixian County, Hebei Province, wherein the mass content of dolomite is 25%, mechanically produce particles with a particle size of 0.25-0.6mm, and dry at 105°C until constant weight ;

[0052] (2) is identical with embodiment step (2);

[0053] (3) Take 1000g of dredged sediment from the Feihe Lake area in Chaohu Hunan, mix it with the calcium-based sepiolite treated in step (2) according to the dry weight mass ratio of 100:15, and cure it under natural environmental conditions for 9 days.

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Abstract

The invention discloses a rigid substrate modifier used after riverway or lake dredging, and a preparation method and applications thereof, and belongs to the field of water body substrate processing. According to applications of the rigid substrate modifier, heat-treated calcium-based sepiolite and / or calcium-based attapulgite clay with high-efficiency phosphorus fixing performance are added into riverway or lake dredged sludge for uniform mixing; an obtained mixture is stored for 7 to 10 days under natural environmental conditions; and then the mixture is delivered back to the dredged riverways or lakes for repairing and modifying of rigid substrate. Mixing of calcium-based sepiolite and / or calcium-based attapulgite clay with the dredged sludge is capable of effectively fixing phosphor in the dredged sludge, mineralizing organic matters in the dredged sludge, reducing water content, increasing porosity, and avoiding secondary contamination; and the processes dredged sludge is delivered back into the lakes, so that rigid substrate obtained via dredging is modified, adaptability of aquatic organisms is improved, recycling of the dredged sludge is realized, and damaged substrate environment is improved.

Description

technical field [0001] The invention relates to the field of water body bottom treatment, in particular to a hard bottom modifier after dredging of rivers or lakes, and a preparation method and application thereof. Background technique [0002] In aquatic ecosystems, sediment is an important reservoir for nutrients such as phosphorus. After the pollution generated by the outside world is effectively controlled, the release of sediment under the action of biological or physical factors may still cause the water body to remain in a considerable Sustain eutrophication over a long period of time. The sediment dredging can permanently remove the polluted sediment from the lake, so it is widely used in lake treatment. [0003] Sediment dredging has great advantages in sediment control, but there are also two main problems. One is that a large amount of dredged sediment is inevitably generated during the dredging process, and the water content of the sediment is high, which is dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
CPCC02F11/00C02F2101/105C02F2101/16C02F2103/007
Inventor 孔明张毅敏晁建颖彭福全杨飞巫丹
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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