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Bottom mud pollution blocking particle as well as preparation method and application thereof

A sediment and particle technology, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problems of loss of coverage and barrier effect, uneven river channels, pollution, etc., and achieve the elimination of black water Odor and mud problems, good anti-scourability, effect of reducing risk of exposure

Pending Publication Date: 2022-06-21
GUANGZHOU RESOURCE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is that the barrier effect is difficult to sustain. The permeability coefficient of covering materials such as sand and gravel is too high, and pollutants such as ammonia nitrogen can easily pass through the covering layer within a few days and pollute the overlying water again.
The second is the problem of anti-erosion. The shear flow rate of sand and other minerals is 0.4-0.6m / s. In the river with too fast flow rate or in the flood season, the sediment covering material is easy to be eroded and lost, thus losing the covering and blocking effect. Ecological blanket Erosion resistance and other products are slightly stronger, but the existing rivers are uneven, and it is difficult for the ecological blanket to achieve the ideal coverage effect

Method used

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  • Bottom mud pollution blocking particle as well as preparation method and application thereof
  • Bottom mud pollution blocking particle as well as preparation method and application thereof
  • Bottom mud pollution blocking particle as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0074] Preparation of reactive components: the materials of the expansion layer (expansion agent and / or active agent) are stirred at room temperature for 10-20 minutes, and the mixture is uniform;

[0075] Preparation of sediment pollution blocking: the aggregate coated with binder and the uniformly mixed reactive component materials are fully mixed, granulated, dried, and screened to obtain sediment pollution blocking particles.

[0076] The compositions of the sediment pollution blocking particles of different examples and comparative examples are shown in the following table.

[0077]

[0078]

[0079] Note: The preparation method of Comparative Example 1 is to mix aggregate, binder, expansion agent and active agent together, granulate, dry, and sieve to obtain sediment pollution blocking particles; expansion agent is the expansion coefficient unless otherwise specified. It is 20 to 30 times the sodium bentonite.

[0080] Performance Test Example

[0081] The produc...

Embodiment 4

[0103] Examples 4 and 5 select larger gravel with a particle size of 10 to 20 mm, and its specific surface area is smaller than the gravel with a particle size of 3 to 7 mm. Therefore, the proportion of gravel of the products prepared in Examples 4 and 5 reaches 90%. % and 91%, the proportion of bentonite decreased, which led to the decline of the product's sediment pollutant control effect and the decline of the anti-scour performance. In Example 6, pebbles with a particle size of 30-50 mm were selected, and the control effect of the prepared product on sediment pollutants decreased more significantly, and the CMC and bentonite, which accounted for 6% of the product weight, lost only 1%.

Embodiment 7

[0104] Example 7 selects the river sand (0.5~2mm) with the smallest particle size. Because the specific surface area of ​​the aggregate is larger, the bentonite ratio of the prepared product is increased to 18%, and the control effect of the product on the sediment pollutants is the same as that of Example 1. ~3 is close, but the anti-scour performance of the product has declined. Considering the endogenous inhibitory effect, anti-scour performance and product cost of the product, the preferred particle size is 3-7mm gravel: CMC: sodium bentonite: active agent = 86:1.5 :10.5:2 is the preferred formula for the product.

[0105] Comparison of the application effects of different materials covering

[0106] In one example, the application effect of the granular product in Example 1 and the conventional covering material (river sand) was compared.

[0107] The test device is the same as in Test Example 3, and the granular product prepared in Example 1 is placed on the soil surfac...

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Abstract

The invention discloses sediment pollution blocking particles as well as a preparation method and application thereof. According to the particles, natural minerals such as gravels are used as framework materials, and expandable functional materials such as sodium bentonite are adhered to aggregate through an adhesive, so that the particles can quickly reach the surface layer of the bottom mud and absorb water to expand, and a continuous and highly impermeable isolating layer resistant to scouring of certain water flow is formed on the surface layer of the polluted bottom mud. The particles are combined with various covering materials to achieve oxidation reduction, supporting, blocking and protection effects respectively, and after the particles are laid in sequence, a stable composite covering layer is formed between muddy water. Polluted sediment is effectively prevented from releasing pollutants such as ammonia nitrogen and total phosphorus to overlying water after covering, and benign improvement of water quality of a water body is promoted. AVS release and bottom mud gas production are effectively prevented, and the problems of black and odorous water body and mud cake caused by release of gas such as bottom mud AVS are solved. Heavy metals, POPs and the like are effectively prevented from migrating to overlying water, and the exposure risk of toxic pollutants is reduced.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a sediment pollution blocking particle and a preparation method and application thereof. Background technique [0002] At present, a large number of rivers and lakes, especially urban rivers, lakes, ponds, and reservoirs, have suffered from different degrees of pollution, which has led to environmental problems such as eutrophication, algal blooms, and black and odorous water bodies. Sediment is an important part of the river and lake ecosystem. When the river or lake is polluted, beyond the self-purification capacity of the water body, a large amount of pollutants are deposited and form a polluted bottom mud layer. At this time, the polluted bottom mud continuously releases ammonia nitrogen, hydrogen sulfide and phosphoric acid into the water body. Salt and other pollutants increase the pollution burden of water bodies. [0003] In 2015, the Ministry of Housing and Urban...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/28B01J20/16B01J20/20B01J20/30B01J20/24C02F11/00C02F11/02C02F11/04
CPCB01J20/12B01J20/2803B01J20/28004B01J20/28016B01J20/10B01J20/165B01J20/04B01J20/20B01J20/24C02F11/00C02F11/02C02F11/04
Inventor 吴闪闪苏蕾刘付文晓乔毅苏玉婷许志国张亮
Owner GUANGZHOU RESOURCE ENVIRONMENTAL PROTECTION TECH CO LTD
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