Dehydration drying method capable of improving bearing capacity of dredged sediment stock dump

A technology for dredging sediment and bearing capacity, which is applied in the fields of soil protection, construction, and infrastructure engineering, etc. It can solve the problems of reducing the drying speed of dredged sediment, low land utilization rate, secondary pollution, etc., and achieve faster muddy water Separation rate, reduce energy consumption, and improve the effect of sediment bearing capacity

Inactive Publication Date: 2012-03-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dredged sediment has occupied the dry storage yard for a long time, and the land utilization rate is low. In case of precipitation, it wi

Method used

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  • Dehydration drying method capable of improving bearing capacity of dredged sediment stock dump
  • Dehydration drying method capable of improving bearing capacity of dredged sediment stock dump
  • Dehydration drying method capable of improving bearing capacity of dredged sediment stock dump

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Experimental program
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Embodiment 1

[0032] The yard structure that the present invention builds is as figure 1 , figure 2 , image 3 As shown, including: 1 sediment storage yard, 2 drainage outlet, 3 drainage ditch, 4 drainage pipe, 5 gravel, 6 plastic drainage board, 7 plastic water collection pipe, 8 sealing film, 9 external vacuum system, 10 dehydrating agent mixer , 11 improver mixer, 12 mud pipe.

[0033] Such as figure 1 , figure 2 , image 3 As shown, the present invention builds a drainage system in the bottom mud stockyard, and the drainage system is composed of an upper drainage outlet 2, a lower drainage ditch 3 and a drainage pipe 4, and a plastic drainage board 6 running through the middle.

[0034] Firstly, a drainage outlet 2 is set on one side of the sediment storage yard 1, the lower side of the drainage outlet 2 is 1-1.2m away from the bottom of the storage yard, and the upper side of the drainage outlet 2 is flush with the top of the storage yard. The width of the drain outlet 2 is 1.2...

Embodiment 2

[0043] A dehydration and drying method capable of improving the bearing capacity of a dredged sediment stockpile, which adopts the following steps: after the dredged mud is evenly mixed with a dehydrating agent and a modifier, it enters a stockyard surrounded by a cofferdam; Vacuum dehydration devices are installed at the drain outlet and the top of the storage yard, and several drainage ditches, drainage pipes and seepage gravels are arranged parallel to each other at the bottom of the storage yard. Among them: the drainage pipes are laid in the drainage ditch, wrapped with non-woven fabrics outside, and the seepage gravels are set on Between the drainage ditch and the drainage pipe, holes are drilled around the pipe wall of the drainage pipe, and the drainage outlet is arranged on the edge of the cofferdam on one side of the stockyard.

[0044] The dehydrating agent used is PAC or FeCl 3 , what adopted in the present embodiment is PAC, and improving agent can be the fly ash ...

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Abstract

The invention relates to a dehydration drying method capable of improving the bearing capacity of a dredged sediment stock dump. In the method, before dredged sediment enters a stock dump, a dehydrating agent and an modifying agent are added in a dredging pipe, a water outlet is arranged at one side of the stock dump, the upper side of the water outlet is abreast with the top of the stock dump, a plurality of parallel drainage ditches are arranged at the bottom of the stock dump at intervals, drain pipes are laid in the drainage ditches and slope towards the water outlet by a certain gradient, holes are formed on the peripheries of the drain pipes at regular intervals, plastic drainage boards are inserted to the bottom from the top of the stock dump, plastic water collecting pipes are laid on the top of the stock dump, then sealing films are laid, and the separated free water flows in the bottom drainage ditches via a sediment precipitation layer, flows through gravel, enters drain pipes and is discharged from the stock dump after being collected by the drain pipes. Compared with the prior art, the dehydration drying method can improve the bearing capacity of a dredge sediment stock dump, and shorten the occupation time of a temporary dredged sediment stock dump land.

Description

technical field [0001] The invention belongs to the technical field of dredging sediment treatment and disposal in environmental engineering, and in particular relates to a method that can accelerate the dehydration and drying process of dredging sediment and then improve the bearing capacity of the storage yard, quickly reduce the moisture content of the storage yard sediment, and shorten the storage time of the storage yard. The land occupation cycle improves the recycling rate of the storage yard and saves land resources. Background technique [0002] Environmental dredging is considered to be an important lake reconstruction technology. It controls the release of pollutants or reduces the bioavailability of pollutants by removing pollutant-rich surface sediments. effective way. [0003] During the dredging process, a large amount of polluted sediment will be produced, which has high moisture content, fine particles, negative charge, and rich in nutrients such as nitroge...

Claims

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Application Information

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IPC IPC(8): E02D3/10E02D3/12
Inventor 戴鼎立何圣兵高建文谢希王虹杨峰峰
Owner SHANGHAI JIAO TONG UNIV
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