A composite soil-based material and its use in preparing green planting soil from river and lake dredging mud

A soil-based and composite technology, applied in the field of environmental waste treatment and resource utilization, can solve the problems of long-term land occupation, lack of strength, and heavy metal pollution of nitrogen and phosphorus nutrients in surrounding water bodies, and achieve cost economy, increased strength, and The effect of heavy metal stabilization

Active Publication Date: 2021-03-26
CHINA CONSTR SECOND ENG BUREAU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These high-moisture, fluid dredging muds have almost no strength. Conventional disposal methods not only occupy land for a long time, but also pose pollution risks such as nitrogen, phosphorus, nutrients, and heavy metals to the surrounding water bodies and soil environments.

Method used

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  • A composite soil-based material and its use in preparing green planting soil from river and lake dredging mud
  • A composite soil-based material and its use in preparing green planting soil from river and lake dredging mud
  • A composite soil-based material and its use in preparing green planting soil from river and lake dredging mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]The raw material components of the composite soil material are referred to as the weight component ratio, with the main agent for cationic polyacrylamide 2.0 kg, polymers 5.0 kg, silicate cement 30.0kg, modified fly ash 35.0kg of pulverized straw; the auxiliary agent is 1.5 kg of formate, polyglutamic acid 3.0kg, activated humic acid 2.5kg.

[0029]Among them, the preparation method of modified powder coal ash and straw is as follows: Select crop straw, crush, crushing and controlling the length of 5mm in the surrounding area of ​​corn, rice, and mixing the fly ash and pulverizing straw by mass than 1: 2, Add 1-3 wt.% Sodium hydroxide solid, then add water than 1 kg: 10 L, 10 min at 300 ° C, solid phase residual separation, washing, and dry after drying, and obtained modified fly ash and straw.

[0030]The raw materials of the agencies and the aids are given to 200 mean left and right sieves, respectively, and the auxiliary and auxiliary agents and auxiliaries are uniformly obtained...

Embodiment 2

[0033]The raw material components of the composite soil material are referred to as the weight fraction of the weight of the composite soil material, with the main agent for cationic polyacrylamide 2.0 kg, polymerized ferric chloride 5.0kg, silicate cement 30.0kg, fly ash and pulverization 35.0kg of straw (the mass ratio of fly ash and pulverized straw is 1: 2); the auxiliary agent is 1.5 kg of calcium carboxylate, polyglutamic acid 3.0kg, activated humic acid 2.5kg.

[0034]The test was selected as the Wangjia River dredging slurry as a test sample (Test Sample and Example 1 Test Sample as the same place, the same batch collection), and the dredging slurry content was 95%. The above-mentioned compound soil material main agent, the auxiliary and dredging mud are mixed into a homogenized pool than 6: 1: 50, and then pumped into a plate filter press for dehydration reduction treatment, filtration The pressure is 1.6 MPa, the pressure filter time is 15 min, and the mud cake after dehydrat...

Embodiment 3

[0037]According to the weight of the weight part ratio, the raw material components of the composite soil material, 35.0kg of silicate cement, 30.0kg, fly ash (fly ash with pulverized straw) The mass ratio of the pulverized straw is 1: 2).

[0038]The test was selected as the Wangjia River dredging slurry as a test sample (Test Sample and Example 1 Test Sample as the same place, the same batch collection), and the dredging slurry content was 95%. The composite soil material prepared above and the dredged slurry were mixed in a homogenized pool than 7:50, and then pumped into the plate frame filter machine for dehydration reduction treatment, filtering pressure 1.6MPa, pressure filter time For 15 min, the mud cake after dehydration enters the maintenance process, and the maintenance time is 14d.

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Abstract

The invention discloses a composite soil material and application of the composite soil material in preparation of greening planting soil from river and lake dredging mud. The composite soil materialcomprises the following components in parts by weight: main agents: 1-3 parts of cationic polyacrylamide, 4-6 parts of polyferric chloride, 20-40 parts of Portland cement, and 25-45 parts of modifiedfly ash and straw; and auxiliaries: 1-2 parts of calcium formate, 2-4 parts of polyglutamic acid and 2-3 parts of activated humic acid. The functions of dehydration reduction, heavy metal stabilization, strength improvement, soil structure and nutrient improvement and the like are integrated for the first time, and repeated technological operation during single implementation of traditional functions or functional compounding is avoided; and the final way-out problem of dredging mud treatment is solved in a resource utilization form of greening planting soil products, the use requirements of planting greening soil in surrounding areas are supplemented, the goal of returning non-point source pollution collected by river and lake dredging mud to soil in a stable form is achieved, and the invention has operable good application prospects.

Description

Technical field[0001]The invention belongs to the field of environmental waste treatment and resource utilization, and the treatment and application of dredging mud, and specifically, the use of a composite soil material and is used for the use of green planting soil for the preparation of green planting soil.Background technique[0002]In the water environmental governance project of the river lake, in order to remove the internal source pollution or recovery of river lake, a large number of dredged mud will inevitably produce a large amount of dredging mud. These high aqueous rates, there is almost no intensity of dredging slurry, and conventional abandoning methods are not only long-term occupied land, and there will be pollution risks such as nitrogen phosphorus nutrients and heavy metals such as peripheral water, soil environment. Solving the reduction of dredged mud, harmless and resourceping is already a top priority in the problem of resolving the environmental governance of r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40A01G24/10A01G24/30C05G3/00C05G3/80C09K101/00C09K109/00
CPCA01G24/10A01G24/30C05D9/00C05G3/00C09K17/40C09K2101/00C09K2109/00C05G3/80C05F7/00C05F11/00C05F11/02
Inventor 黄达琦张耀吴邦硕周伟
Owner CHINA CONSTR SECOND ENG BUREAU LTD
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