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High-organic-content dredged silt composite curing material

A technology of organic matter content and dredging sludge, applied in fixed/solidified sludge treatment, sludge treatment, solid waste management, etc., can solve problems such as affecting biological growth, easily polluting the surrounding environment, endangering human health, etc. Low content, good for sustainable development, high strength and stability

Active Publication Date: 2017-05-17
NANJING UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passive stockpiling of industrial waste not only occupies a large amount of land, but also causes a waste of manpower and material resources, and easily pollutes the surrounding environment
Some wastes even silt up the river, pollute the water system, affect the growth of organisms, and endanger human health

Method used

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  • High-organic-content dredged silt composite curing material
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  • High-organic-content dredged silt composite curing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The mixing ratio of high organic matter content dredging silt composite curing material in the present embodiment is: cement 6%, fly ash 5%, slag 4%, lime 4%, phosphogypsum 3%, exciter 2%, put silt, curing agent Mix well in a mixing pot and stir for 5 minutes. For discharging, the mixed cured material is pressed into shape by a testing machine, and a cylindrical sample with a size of Φ50*50mm is prepared. Standard curing and performance test results are shown in Table 1. figure 1 It is the SEM image of the dredged silt hardened body before solidification treatment. It can be seen that the structure of the dredged silt hardened body is loose; figure 2 It is the SEM image of the dredged silt solidified soil after curing in this embodiment. It can be seen that the solidified soil has a relatively dense structure after solidification treatment.

Embodiment 2

[0043]In the present embodiment, the mixing ratio of dredging silt composite curing material with high organic matter content is: 9% cement, 7.5% fly ash, 6% slag, 6% lime, 5% phosphogypsum, and 4% activator. Mix well in a mixing pot and stir for 5 minutes. For discharging, the mixed cured material is pressed into shape by a testing machine, and a cylindrical sample with a size of Φ50*50mm is prepared. Standard curing and performance test results are shown in Table 1.

Embodiment 3

[0045] The mixing ratio of high organic content dredging silt composite curing material in the present embodiment is: cement 6%, fly ash 5%, slag 4%, lime 4%, phosphogypsum 3%, activator 2%, potassium persulfate 0.8%, Put the sludge and curing agent in a mixing pot and mix evenly, and stir for 5 minutes. For discharging, the mixed cured material is pressed into shape by a testing machine, and a cylindrical sample with a size of Φ50*50mm is prepared. Standard curing and performance test results are shown in Table 1.

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Abstract

The invention discloses a high-organic-content dredged silt composite curing material. The curing material has the advantages of being low in cost and excellent in performance, and capable of utilizing industrial waste materials, effectively curing silt with a high organic content and achieving comprehensive utilization of silt and solid waste. The high-organic-content dredged silt composite curing material of the invention is prepared from the following ingredients in mass percent: 6% to 9% of cement, 5% to 7.5% of coal ash, 4% to 6% of mineral waste residue, 4% to 6% of lime, 3% to 5% of ardealite, 2% to 4% of excitant and 0.6% to 1.8% or 1.2% to 8% of strong oxidant, wherein the use amount of each ingredient is the percent of the ingredient mass to the dredged silt mass, the strong oxidant is potassium sulphate or potassium permanganate or H oxidant, the use amount of the strong oxidant is 0.6% to 1.8% when the strong oxidant is the potassium sulphate or the postassium permanganate, and the use amount of the strong oxidant is 1.2% to 5% when the strong oxidant is the H oxidant.

Description

technical field [0001] The invention specifically relates to a solidified material, more specifically to a composite solidified material of dredged silt with high organic matter content. Background technique [0002] In order to improve the water quality of rivers and lakes, ensure the normal flood discharge capacity of rivers and the smooth flow of waterways and ports, my country has carried out large-scale dredging and dredging work, and the resulting huge amount of silt has become an unavoidable practical problem. Silt has special properties and is quite different from ordinary soil. Its color is generally dark gray or dark green, and has an odor; the natural moisture content is higher than the liquid limit, the compressibility is extremely high, the strength is extremely low, the water permeability is poor, and the shear strength is low. High moisture content and rich organic matter are the most prominent characteristics of sludge, which affect other properties. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B18/08C04B22/14C02F11/00
CPCC02F11/008C04B18/08C04B22/144C04B28/08C02F2103/007C04B2201/50C04B7/00C04B22/064C04B22/062C04B22/08C04B22/066C04B22/002C04B22/06C04B22/14Y02W30/91
Inventor 华苏东谷重姚晓刘娟赵卫星
Owner NANJING UNIV OF TECH
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