Desalination method of hydraulic fill sea mud

A desalination and bony technology, applied in the direction of site preparation methods, chemical instruments and methods, restoration of contaminated soil, etc., can solve the problems of poor permeability of dredged reclamation sea mud, limited waste resources, long desalination time, etc., to shorten Effect of desalination cycle, improvement of use efficiency, and improvement of penetration rate

Inactive Publication Date: 2010-07-07
TIANJIN SEASHORE SALINE ALKALI SOIL BIOLOGICAL PLANTING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Desalination through natural rainfall, and then improvement through the natural succession of saline vegetation takes too long a period to meet the time requirements for landscaping construction, economic development, and human settlements construction. At the same time, the permeability of dredged reclamation sea mud is poor, and the desalination time is also long. Although the improved method of mixing fly ash and alkali slag can speed up the desalination rate of dredged reclamation sea mud, the waste resources are limited and subject to geographical restrictions. Due to technological progress, fly ash is mostly processed into materials with higher added value. At present, it is difficult to use fly ash as an improved material for dredging sea mud. It is necessary to find alternatives to other wastes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The dredging reclamation sea mud in Tianjin Binhai New Area has high clay content, strong plasticity, high salt content, and low permeability coefficient. In view of this characteristic, the treatment method is as follows: (1) Lay underground pipes in the dredging reclamation area in early November and carry out 80cm soil (2) After freezing in winter and thawing in spring, the structure of the dredged sea mud is loose, and then calcium carbide slag and dredged sand are added to the dredged sea mud. The addition amount of sand is 0.05 parts, the addition amount of dredged sand is 0.4 parts, and the mechanical mixing is uniform; (3) Irrigate and wash the mixed dredged sea mud, and the water pressure of 7cm is maintained during the flushing process, and the flushing water is pumped by The underground underground pipe is discharged and lasts for 120 hours until the total salt content of the deep plowed soil layer is less than or equal to 3g / kg.

Embodiment 2

[0023] The dredging reclamation sea mud in Tianjin Binhai New Area has high clay content, strong plasticity, high salt content, and low permeability coefficient. In view of this characteristic, the treatment method is as follows: (1) Lay underground pipes in the dredging reclamation area in early November and carry out 40cm soil (2) After freezing in winter and thawing in spring, the structure of the dredged sea mud is loose, and then calcium carbide slag and dredged sand are added to the dredged sea mud. The addition amount of the sand is 0.05 parts, the addition amount of the dredging sand is 0.4 parts, and the mechanical mixing is even; (3) Irrigate and wash the mixed dredged sea mud, and the water pressure of 5cm is maintained during the flushing process, and the flushing water is pumped by The underground underground pipe is discharged for 54 hours, until the total salt content of the deeply excavated soil layer is less than or equal to 3g / kg.

Embodiment 3

[0025] The dredging reclamation sea mud in Tianjin Binhai New Area has high clay content, strong plasticity, high salt content, and low permeability coefficient. In view of this characteristic, the treatment method is as follows: (1) Lay underground pipes in the dredging reclamation area in early November and carry out 80cm soil (2) After freezing in winter and thawing in spring, the structure of the dredged sea mud is loose, and then calcium carbide slag and dredged sand are added to the dredged sea mud. The addition amount of sand is 0.25 parts, the addition amount of dredged sand is 0.25 parts, and the mechanical mixing is uniform; (3) Irrigate and wash the mixed dredged sea mud, and the water pressure of 7cm is maintained during the flushing process, and the flushing water is pumped by The underground underground pipe is discharged and lasts for 180 hours until the total salt content of the deep plowed soil layer is less than or equal to 3g / kg.

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Abstract

The invention relates to a desalination method of hydraulic fill sea mud. The method comprises the following steps: 1. laying underground buried pipes in a hydraulic fill region, deep plowing soil layer; 2. after performing alternate flooding and drying and alternate freezing and thawing in winter and spring, mixing carbide slag and skeletal material with hydraulic fill sea mud, wherein the volume ratio of hydraulic fill sea mud to carbide slag and skeletal material is 0.5-0.65:0.01-0.5:0.25-0.5, stirring evenly; and 3. irrigating and desalting the mixed hydraulic fill sea mud, discharging flushing water through the underground buried pipes. The beneficial effects of the invention are as follows: the penetration rate and chemical property of hydraulic fill sea mud are changed and the penetration ability and desalination speed of hydraulic fill sea mud are increased, thus the salinity of hydraulic fill sea mud can be reduced below the tolerance level of plant growth in a short time, the desalination cycle of the prior art can be greatly shortened, and the efficiency of water used for desalination is increased at the same time.

Description

technical field [0001] The invention relates to an improved method for dredging and reclamation of sea mud, in particular to a method for desalination of dredging and reclamation of sea mud. Background technique [0002] Most of the coastal areas in northern China have flat terrain, low altitude, high groundwater level, high salinity, sparse vegetation, high soil salinity, difficult soil desalination, and are extremely vulnerable to typhoons, storm surges, salinization, sandstorms, and salt Due to the serious impact of dust storms, the ecological system is fragile. With the development and opening of the coast, the urbanization process is accelerating. On the one hand, many places need regional padding to raise the ground. Landscaping to beautify the urban environment also requires a large amount of soil sources suitable for plant growth. If the traditional method of farmland foreign soil is used, it obviously violates the concept of sustainable development. However, dredgi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02C09K17/00B09C1/02
Inventor 张清黄明勇王振宇柯丽丽
Owner TIANJIN SEASHORE SALINE ALKALI SOIL BIOLOGICAL PLANTING ENG
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