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Method for solidifying sludge with high water content

A solidification method and high water content technology, applied in chemical instruments and methods, water/sludge/sewage treatment, fixed/solidified sludge treatment, etc., to achieve the effect of improving utilization rate, high early strength and low compressibility

Inactive Publication Date: 2018-06-29
HUBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, the water content of general dredged silt may exceed 180%, and the existing patents still have great shortcomings in the treatment of high water content silt

Method used

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  • Method for solidifying sludge with high water content

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The silt was taken from a construction site in Zhangzhou, Fujian. It was alluvial flow plastic to soft plastic silt with a moisture content of 52.2-92.4%, with a liquid limit of 40.9-73.1%, a plastic limit of 26.9-49.4%, and a cohesion of 3.5-11.0 kPa, the internal friction angle is 1.6-2.2°, and the compressibility coefficient is 1.48-2.32MPa -1 . The water content of the control sludge is 100%, the amount of alkali slag is 40%, the solidified material is mineral powder 15%, superabsorbent resin 0.2%, and water glass 2%. The sample was prepared by vibration method to discharge the air. After 7 days of curing in the standard curing room, the cohesion of the solidified soil was 155kPa, the internal friction angle was 30.1°, and the compressibility coefficient was 0.3MPa. -1 ; The unconfined compressive strength of the solidified soil after standard curing for 7d and 28d was 0.65MPa and 1.12MPa respectively, and the mechanical properties of the silt were well improved. ...

Embodiment 2

[0044] The silt was dredged from a lake in Wuhan City, Hubei Province. Its moisture content was about 68.2-95.5% in the grabbing and stockpiling test. It was in a flow-plastic state. The liquid and plastic limits were 66.4% and 26.2% respectively, and the organic matter content was about 1.2%. Control the water content of the sludge to 90%, the amount of alkali slag to 40%, the solidified material to be mineral powder 15%, superabsorbent resin 0.1%, and water glass 2%. The sample was prepared by vibration method to discharge the air. After 7 days of curing in the standard curing room, the cohesion of the solidified soil was 137kPa, the internal friction angle was 24.7°, and the compressibility coefficient was 0.3MPa. -1 ; The unconfined compressive strength of the solidified soil after standard curing for 7d and 28d is 0.48MPa and 0.96MPa respectively, meeting the mechanical property requirements of general engineering fill.

Embodiment 3

[0046] The silt was dredged from a certain river in Wuhan City, Hubei Province. Its water content was 140%-180% in the grabbing and stockpiling test, and it was in a flow-plastic state. The liquid and plastic limits were 97.4% and 36.2% respectively, and the organic matter content was about 9.3% burning method). Control the moisture content of the sludge to 140%, the amount of alkali slag to 50%, the solidified material to be mineral powder 20%, superabsorbent resin 0.3%, and water glass 5%. Vibration method was used to prepare samples to discharge the air. After 7 days of curing in the standard curing room, the cohesion of the solidified soil was 146kPa, the internal friction angle was 26.7°, and the compressibility coefficient was 0.4MPa. -1 ; The unconfined compressive strength of the solidified soil after standard curing for 7d and 28d is 0.41MPa and 0.86MPa respectively. Control the water content of the sludge to 180%, the amount of alkali slag to 50%, the solidified mat...

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Abstract

The invention discloses a method for solidifying sludge with a high water content. At first, dredged sludge is collected and stored, basic physical indexes of sludge are measured, the sludge and alkali residues are mixed to form matrix soil; a curing material is added and then is evenly mixed and stirred; then the matrix soil containing the curing agent is transported to a fixed location; the matrix soil is covered and cured for a prescribed period; and finally the mechanical indexes of cured sludge are measured. The optimal ratio of alkali residues to dry sludge is 30-50:100. The curing material comprises following components in percentage by the weight of dry mixed soil: 10 to 25% of mineral powder, 0.1 to 0.5% of super absorbent resin, and 2 to 6% of sodium silicate. The cooperative effect between alkali residues and sludge with a high water content is utilized to form matrix soil; super absorbent resin is used to reduce the water content of sludge, the utilization rate of alkali residues is increased, the solidification cost is reduced, and the solidified soil has the advantages of high early strength and low compressibility and meets the engineering requirements of filling soil.

Description

technical field [0001] The invention belongs to the technical field of sludge solidification treatment, and relates to a sludge solidification method, in particular to a high water content sludge solidification method. Background technique [0002] With the acceleration of urbanization and industrialization in our country, the problem of water pollution is becoming more and more serious, and dredging sediment is the need to remove the internal source of water pollution, so the output of dredging sludge is increasing day by day. For example, the amount of dredged silt produced in the Pearl River Delta is as high as 80 million m 3 Around 6 million m3 of dredging in the main rivers of Tianjin urban area 3 , the total amount of silt at the bottom of East Lake in Wuhan reached 35.22 million m 3 . Dredged silt has the characteristics of high water content, flow-plastic state and extremely low strength, and often contains pollutants such as ammonia nitrogen and heavy metals. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C02F11/00
CPCC02F11/008C04B28/006C04B2111/00017C04B2111/00767C04B2201/50C04B22/00C04B18/141C04B2103/0051
Inventor 何俊杨进马强王迎斌苏英刘永莉胡智李丽华庄心善陶高梁朱志政石小康栗志翔
Owner HUBEI UNIV OF TECH
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