Soil treatment method for dredged sediment

A treatment method and technology for dredging sediment, which can be used in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., and can solve the problems of high hardness of solidified soil, unsuitable for plant growth, and high pH value of solidified soil. , to achieve cost-saving effect

Active Publication Date: 2010-08-18
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these patents, silicate and volcanic ash materials are basically used as solidifying agents to solidify the sludge. Although this method can obtain high-strength solidified soil, it will also lead to a high pH value of the solidified soil. , the hardness of the solidified soil is too large, the structure is dense, and it is not suitable for plant growth

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  • Soil treatment method for dredged sediment

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Effect test

Embodiment 1

[0019] (1) Solidification treatment of dredged sediments The dredged sediments of Wuxi Gonghu Bay have a moisture content of 66%, a clay content of 19%, an organic matter content of 3.2%, and a pH value of 7.2. When the amount of cement added is 50kg / m3 When it is muddy, the 7-day unconfined compressive strength of solidified sludge is 30kPa, the pH value is 11, and the density is 1.42g / cm 3 , the porosity is 35%, at this time the solidified soil is completely unsuitable for the growth of plants.

[0020] (2) Soil treatment of solidified soil Add 6% of crushed rice stalk after crushing the above solidified soil and mix evenly, the density of the soil is 1.11g / cm 3 , the porosity is 54%, the ground pressure of the fill is 30kPa, and the pH value of the fill is 8.5 after being placed for 10 days. The improved silt at this time can fully meet the cultivation intensity and plant growth requirements required as greening soil. After trial planting of rapeseed, green vegetables and ...

Embodiment 2

[0022] (1) Solidification treatment of dredged bottom mud The dredged bottom mud of Wuxi Wulihu Bay has a moisture content of 108%, a clay content of 36%, an organic matter content of 1.45%, and a pH value of 7.6. When the amount of cement added is 75kg / When the amount of mud and gypsum added is 8kg / square mud, the 7-day unconfined compressive strength of the solidified mud is 40kPa, the pH value is 11.5, and the density is 1.44g / cm 3 , the porosity is 38%, at this time the solidified soil is completely unsuitable for the growth of plants.

[0023] (2) Soil treatment of solidified soil After the above solidified soil is crushed, add 8% of crushed corn stalks and mix evenly. The density of the soil is 1.08g / cm 3 , the porosity is 60%, the ground pressure of the fill is 35kPa, and the pH value of the fill is 8.7 after 14 days of placement. The improved silt at this time can fully meet the cultivation intensity and plant growth requirements required as greening soil. After tria...

Embodiment 3

[0025] (1) Solidification treatment of dredged bottom mud The dredged bottom mud of Shenzhen Dongguan Canal has a moisture content of 112%, a clay content of 36%, an organic matter content of 10.79%, and a pH value of 6.5. When the amount of cement added is 100kg / cubic mud , when the amount of fly ash added is 20kg / square mud, and the amount of gypsum added is 10kg / square mud, the 7-day unconfined compressive strength of solidified sludge is 58kPa, the pH value is 11, and the density is 1.41g / cm 3 , the porosity is 39%, at this time the solidified soil is completely unsuitable for the growth of plants.

[0026] (2) Soil treatment of solidified soil After the above solidified soil is crushed, add 8% rice husk and mix evenly. The density of the soil is 1.06g / cm 3 , the porosity is 53%, the ground pressure of the fill is 50kPa, and the pH value of the fill is 7.9 after being placed for 14 days. The improved silt at this time can fully meet the cultivation intensity and plant gro...

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Abstract

The invention discloses a soil treatment method for dredged sediment, which comprises a solidification step for the dredged sediment and a soil treatment step for solidified soil. After grinded biomass is mixed with the crushed dredged sediment solidified soil, the requirement on the plant growth can be met through filling treatment for a period of time. Therefore, during the solidification treatment for the sediment, the cost of the solidification treatment is greatly saved only by meeting the requirement of the lowest intensity man-machine cultivation. After the solidification treatment, the crushed biomass is added for mixing so as to regulate the structure and pores of the solidified soil; and the pH value of the solidified soil is reduced by using the characteristics that the biomass is degraded to generate humic acid. Due to the soil treatment method for the dredged sediment, high water content dredged sediment in the flow state can be rapidly converted into soil for greening or planting.

Description

technical field [0001] The invention relates to a soil treatment method for dredged bottom mud, which is suitable for rapid treatment and resource utilization of high water content bottom mud produced in dredging projects such as rivers, lakes, reservoirs, ponds, ports, and waterways, and belongs to water conservancy and Environmental engineering technology field. Background technique [0002] Dredged sediment is a kind of engineering solid waste with high water content, which cannot be used directly. The dredged sediment of inland products is usually placed permanently in a storage yard, which requires a large amount of land resources, and the storage yard The pollutants are also easy to diffuse to the outside world, and there is a great risk of secondary pollution. With the development of a large number of water conservancy and water environment improvement projects, the problem of storage yard land has become a bottleneck that plagues the progress of the project. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 张春雷汪顺才李磊朱伟
Owner HOHAI UNIV
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