A method and device for in-situ volume reduction of dredged muddy water with high efficiency

Abstract

The invention discloses a method for muddy water dredging and in-situ efficient volume reduction and a device for achieving the method. A dredge pump (1), a two-stage serial hydrocyclone system (III), a coagulant mixing adding system (II) and a centrifugal hydroextractor (IV) are arranged on a dredge ship. The centrifugal hydroextractor is directly connected with the two-stage serial hydrocyclone system. Muddy water is drawn and dredged through the dredge pump (1) on the dredge ship and fed into the two-stage serial hydrocyclone system for concentration volume reduction treatment, concentrated underflow mud obtained after volume reduction is discharged into the centrifugal hydroextractor to be dehydrated, and overflow clear liquid is directly drained into water. Mud cakes obtained after dehydration are lightered to land to be treated, one part of dehydration filter liquor is reused in the coagulant mixing adding system (II), and the rest is directly drained to the water. The method for muddy water dredging and in-situ efficient volume reduction and the device for achieving the method are small in size, small in occupied area and high in solid-liquid separation efficiency, and effluent can be directly drained into the water.

Description

technical field [0001] The invention relates to a method for volume reduction of dredging muddy water, in particular to a method for in-situ and high-efficiency volume reduction of dredging muddy water. The invention also relates to a device for realizing the method for in-situ and high-efficiency volume reduction of dredged muddy water. Background technique [0002] At present, for the dredged muddy water produced by water body dredging, the ex-situ treatment mode is mainly adopted, that is, long-distance blowing or lightering of the dredged muddy water to the land storage yard / treatment yard. However, with the rapid development of dredging technology, the dredgers currently used for dredging have a relatively high productivity, such as the Tianjin Dredging Bureau "Tianjing" cutter suction dredger, with a dredging capacity of up to 4500m 3 / h; Even the dredgers used for environmental protection dredging in small waters have a relatively large output, such as the MC-2000 en...

AI Technical Summary

Problems solved by technology

The first type of technical method requires a long time for concentration, generally more than several hours, and cannot realize in-situ treatment at the dredging site

Although the concentration time of the second type of technology has been greatly reduced, it is generally more than 0.5 hours. The equipment volume and required floor area are relatively large, and it is difficult to implement it on dredging ships.

[0006] So far, there have been no related reports on the in-situ treatment technology and equipment for dredged muddy water that can achieve high-efficiency concentration and volume reduction of dredged muddy water, and at the same time meet the third-level standard of the "Integrated Wastewater Discharge Standard" (GB8978-96)

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