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A dredging sediment heavy metal stabilizing agent and its use method and application

A technology for dredging sediment and heavy metals, which is applied in chemical instruments and methods, fixed/solidified sludge treatment, sludge treatment, etc., and can solve the problems of high alkalinity, secondary pollution, and large addition amount.

Active Publication Date: 2021-04-20
浙江广川工程咨询有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the problems in the prior art that the stabilizing and solidifying reagents have high alkalinity, the large addition amount leads to unsatisfactory leaching effects, and the risk of secondary pollution, the present invention provides a dredging sediment heavy metal stabilizing and solidifying reagent and its use method and Application, the specific scheme is as follows:

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  • A dredging sediment heavy metal stabilizing agent and its use method and application
  • A dredging sediment heavy metal stabilizing agent and its use method and application
  • A dredging sediment heavy metal stabilizing agent and its use method and application

Examples

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Embodiment 1

[0051] A preparation method and planting application of a dredging sediment heavy metal stabilizing agent. The total amount of the stabilizing agent is 100 parts, and the dosage is calculated by the percentage of dry matter of the sediment.

[0052] The components of the stabilizing agent proportioning material parts by weight are as follows:

[0053] 31.5 parts of fly ash

[0054] lime 7 parts

[0055] Kaolin 20 parts

[0056] Sodium carbonate 20 parts

[0057] 20 parts iron sulfate

[0058] 1.5 parts rice straw

[0059] Operation method:

[0060] (1) Dry the dredged sediment of rivers, lakes, reservoirs and ponds to a moisture content of 81% (soil mechanical moisture content);

[0061] (2) Mix and grind lime, fly ash, kaolin, sodium carbonate and iron sulfate, and pass through a 600-mesh sieve to obtain a solidification agent;

[0062] (3) Weigh 1 kg of the dried dredged bottom mud obtained in step (1), and weigh 82 g of the stabilizing and solidifying reagent, mix th...

Embodiment 2

[0082] A preparation method and planting application of a dredging sediment heavy metal stabilizing agent. The total amount of the stabilizing agent is 100 parts, and the dosage is calculated by the percentage of dry matter of the sediment.

[0083] The components of the stabilizing agent proportioning material parts by weight are as follows:

[0084] 31 parts of fly ash

[0085] lime 7 parts

[0086] Kaolin 20 parts

[0087] Sodium silicate 7 parts

[0088] 7 parts sodium carbonate

[0089] Magnesium sulfate 7 parts

[0090] 20 parts iron sulfate

[0091] 1 part rice straw

[0092] Operation method:

[0093] (1) Dry the dredged sediment of rivers, lakes, reservoirs and ponds to a moisture content of 81% (soil mechanical moisture content);

[0094] (2) Mix and grind lime, fly ash, kaolin, sodium silicate, sodium carbonate, magnesium sulfate and iron sulfate, and pass through a 600-mesh sieve to obtain a stable curing agent;

[0095] (3) Weigh 1 kg of the dried dredged...

Embodiment 3

[0115] A preparation method and planting application of a dredging sediment heavy metal stabilizing agent. The total amount of the stabilizing agent is 100 parts, and the dosage is calculated by the percentage of dry matter of the sediment.

[0116] The components of the stabilizing agent proportioning material parts by weight are as follows:

[0117] 32.5 parts of fly ash

[0118] lime 7 parts

[0119] Kaolin 20 parts

[0120] Magnesium sulfate 20 parts

[0121] 20 parts iron sulfate

[0122] Rice straw 0.5 parts

[0123] Operation method:

[0124] (1) Dry the dredged sediment of rivers, lakes, reservoirs and ponds to a moisture content of 81% (soil mechanical moisture content);

[0125] (2) Mix and grind lime, fly ash, kaolin, magnesium carbonate and iron sulfate, and pass through a 600-mesh sieve to obtain a solidification agent;

[0126] (3) Weigh 1 kg of the dried dredged bottom mud obtained in step (1), and weigh 82 g of the stabilizing and solidifying reagent, mi...

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Abstract

The invention belongs to the field of environmental management and protection, and relates to a method for treating and disposing dredged sediment of rivers, lakes, reservoirs, and ponds, in particular to a heavy metal stabilizing agent for dredged sediment and its use method and application. The present invention is a heavy metal stabilizing agent for dredging bottom mud, which is composed of the following raw materials: 25-35 parts of fly ash, 5-10 parts of lime, 15-20 parts of kaolin, 0-10 parts of silicate, 1 part of carbonate ‑20 parts, 1‑20 parts of sulfate and 0.1‑1.5 parts of organic conditioner. The present invention is a dredging sediment heavy metal stabilizing agent and its use method and application. The pH of the stabilizing agent is controllable, can be used for planting applications, and the addition amount is small, the treatment time is short, the stabilizing treatment effect is good, and the stabilizing treatment takes 7 days After dredging, the leaching concentration of heavy metals in the dredged sediment is greatly reduced, the reduction rate of copper, lead, mercury, and arsenic is as high as 90%, and the cadmium is as high as 85%, which can effectively avoid secondary pollution.

Description

technical field [0001] The invention belongs to the field of environmental management and protection, and relates to a method for treating and disposing dredged sediment of rivers, lakes, reservoirs, and ponds, in particular to a heavy metal stabilizing agent for dredged sediment and its use method and application. Background technique [0002] As an important part of urban landscape, flood control and drainage, domestic irrigation and other functions, rivers, lakes, ponds, mountain ponds, and reservoirs are easy to deposit silt in these water bodies, resulting in a reduction in water body area and a decline in water storage capacity. The project of dredging the water body is huge. For example, the dredged silt produced in the Pearl River Delta reaches 80 million m3 every year 3 In 2016, the dredging volume in Zhejiang Province exceeded 100 million m³. Due to the high moisture content, difficult consolidation, large volume, and difficulties in dehydration and consolidation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F101/20
CPCC02F11/008C02F2101/20
Inventor 史燕南韩申秋汤明礼俞炯奇张超杰吴文华许小杰何华军姜建芳姜永兴占川黄阳杰
Owner 浙江广川工程咨询有限公司