Agent vacuum pre-compression method for treating engineering waste slurry

Abstract

The invention belongs to the field of technologies for protecting environments, and particularly discloses an agent vacuum pre-compression method for treating engineering waste slurry. The agent vacuum pre-compression method includes basic steps of adding appropriate quantities of appropriate types of chemical agents into the waste slurry to reduce the water content of the waste slurry and forming sediments with certain framework structures; applying vacuum loads to the sediments to pre-compress the sediments, reducing the water contents of the sediments until preset requirements are met, stopping applying the vacuum loads to the sediments, disassembling vacuum drainage systems and transporting mud to required places after solid and liquid in the mud are separated from each other. The agent vacuum pre-compression method has the advantages that the agent vacuum pre-compression method is high in treatment capacity and treatment efficiency, tens of thousands of squares of slurry to hundreds of thousands of squares of slurry can be treated at one step, and accordingly the agent vacuum pre-compression method is particularly applicable to intensive slurry treating; the mud is low in water content and high in strength after the solid and the liquid in the mud are separated from each other, and can be used as raw materials of building materials, and shortage of earthwork can be overcome if the mud is used for brick manufacturing or building place backfill; the agent vacuum pre-compression method can be used for land reclamation, enclosure regions can be filled with the ultimately treated mud, accordingly, the construction periods can be shortened, and the cost can be lowered.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a rapid solid-liquid separation method for mud with high water content. Background technique [0002] With the increasing number of underground projects such as underground diaphragm walls, shield tunnels and bored piles, more and more engineering waste mud is generated during the construction of these projects. The waste mud generally has the following characteristics: 1) High clay content , Strong dispersibility, it is not difficult to complete self-weight consolidation within a short period of time or all the time; 2) The moisture content is extremely high, generally about 160-300%, and it is in a flowing state for a long time, which will cause serious pollution to the place where it is placed. [0003] At present, there are four common treatment methods for engineering waste mud (hereinafter referred to as "waste mud"): direct external discharge, ...

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Problems solved by technology

The treatment efficiency of this method is very high, but if it is discharged to land, it will cause the undisturbed soil to compact and make it lose its cultivation ability, and if it is discharged to rivers and oceans, it will pollute the waters where it is located; (2) Vacuum filtration uses a vacuum filter press An effective treatment method for solid-liquid separation of waste slurry, the disadvantage is that the treatment efficiency is low, and because it is easy to generate silt when treating slurry with high clay content, it also faces a technical bottleneck

(3) Centrifugal filtration is a method that puts mud into a centrifugal pump, and the liquid is discharged in a high-speed rotating centrifugal pump, and the solid remains. The disadvantage is that the processing efficiency is relatively low; (4) Mechanical pressure filtration can The solid particles in the waste slurry are separated from the liquid in a short period of time, and the mud cake produced after separation can be used as engineering materials (such as fired bricks). The disadvantage is that the processing efficiency is low, and it takes up a lot of space, so it is not suitable for limited sites. Construction site treatment of waste slurry

[0004] Among the above four disposal technologies, Sinotrans discharge is often used at present. High processing costs and other reasons related to

The long-term use of this way of transporting and discharging has polluted the ocean, land and other receiving places or is about to face potential serious pollution threats, and this situation has been intensifying in recent years

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