Treatment method for solidifying bed mud in river

A technology for solidification treatment and bottom mud, applied in the field of environmental engineering, can solve the problems of poor soil mechanics, difficult to dispose of on a large scale, difficult to control costs, etc., and achieve the effects of saving processing costs, low costs, and easy operation.

Active Publication Date: 2007-10-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, various disposal methods have problems such as excessive land occupation, poor soil mechanical properties, difficult cost control, difficulty in large-scale disposal, and possible secondary pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take Suzhou Creek sludge with a water content of 90%, and add 2% coal-fired slag, 3% quicklime and 3% gypsum to the bottom sludge based on the weight of the bottom sludge, and stir and mix to form a mixture. Afterwards, based on the weight of the mixture, 6% of brick chips were added to the mixture, and the solidified precursor was formed after thorough mixing. Spread the cured precursor with a thickness of 30cm in a ventilated rain shelter and add sacks to cover it for curing. The curing temperature is kept above 0°C. When the curing time is less than 7 days, the cured block should avoid contact with moisture such as rainwater. After 7 days, the compressive strength of the cured block can reach 5.3MPa; after 7 days, pour water on the covering such as sacks to keep the covering wet state, continue curing, after 28 days of curing, the compressive strength of the cured block reaches 12.2MPa. The formed cured body can be used to replace concrete blocks in pavement and par...

Embodiment 2

[0019] Take Suzhou Creek sludge with a moisture content of 95%, and add 4% coal-fired slag, 2% quicklime and 2% gypsum to the bottom sludge based on the weight of the bottom sludge, and stir and mix to form a mixture. Afterwards, based on the weight of the mixture, 4% brick chips were added to the mixture, and the cured precursor was formed after thorough mixing. Spread the cured precursor with a thickness of 5cm in a ventilated rain shelter and add sacks to cover it for curing. The curing temperature is kept above 0°C. When the curing time is less than 7 days, the cured block should avoid contact with moisture such as rainwater. After 7 days, the compressive strength of the cured block can reach 6.1MPa; after 7 days, pour water on the covering such as sacks to keep the covering wet state, continue curing, after 28 days of curing, the compressive strength of the cured block reaches 13.6MPa.

Embodiment 3

[0021] Take Suzhou Creek sludge with a water content of 98%, and add 6% coal-fired slag, 1% quicklime and 1% gypsum to the bottom sludge based on the weight of the bottom sludge, and stir and mix to form a mixture. Afterwards, based on the weight of the mixture, 6% of brick chips were added to the mixture, and the solidified precursor was formed after thorough mixing. Spread the cured precursor with a thickness of 30cm in a ventilated rain shelter and add sacks to cover it for curing. The curing temperature is kept above 0°C; when the curing time is less than 7 days, avoid contact between the cured block and rainwater and other moisture. In one day, the compressive strength of the cured block can reach 3.6 MPa; after 7 days, pour water on the covering such as sacks to keep the covering in a moisture-wet state, and continue curing. After 28 days of curing, the compressive strength of the cured block can reach 10.3 MPa.

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Abstract

This invention relates to a method for solidifying river bottom sludge. The method utilizes coal slag, quicklime and gypsum to react with water in the river bottom sludge to solidify river bottom sludge. In addition, construction garbage including bricks and concrete chips are utilized as a supporting material to maintain the solidified river bottom sludge for a certain time. Quicklime as an alkali activator can react with SiO2 and Al2O3 in coal slag. The products can further react with gypsum to obtain calcium sulfoaluminate hydrate. The residual products are further subjected to hydration to solidify river bottom sludge. The solidified river bottom sludge can be used as a substitute for concrete blocks to construct road surface of parks.

Description

technical field [0001] The invention relates to a solidification treatment method for river bottom mud, which directly solidifies the excavated river bottom mud at low cost. It belongs to the field of environmental engineering technology. Background technique [0002] At present, many rivers in our country are beginning to face the problem of sediment dredging and dredging for remediation. For example, the third phase of the comprehensive improvement project of Suzhou Creek in Shanghai will remove sediment from the urban area of ​​about 16.7 kilometers from the mouth of Suzhou Creek to Zhenbei Road Bridge. Dredging, by then, the dredging process is expected to produce 130×10 4 m 3 bottom mud. One of the characteristics of river dredged sediment is high water content and different levels of pollutants. If it is not properly treated and disposed of, it is likely to cause secondary pollution. Therefore, the outlet problem of a large amount of dredged sediment must be proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C04B28/14C04B18/30C04B18/10C04B18/16B28B11/24
CPCY02W30/91
Inventor 朱南文车承丹李艳林赵玲叶清林克明奉均衡
Owner SHANGHAI JIAO TONG UNIV
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