Method for rapidly and ecologically treating coastal beach sludge

Abstract

The invention provides a method for rapidly and ecologically treating coastal beach sludge and belongs to the technical field of coast enclosure for field, port engineering, beach development and the like. The method includes the following steps that firstly, a cofferdam is established and filled with the sludge at a certain height in a blowing manner, and straw blankets are laid on the sludge and connected with a vacuum device through pipes; secondly, the position, on the upper layer of the straw blankets, of the cofferdam is continuously filled with the sludge in a blowing manner to the assigned height; thirdly, crushed straw is added to the sludge on the upper layer of the straw blankets and stirred to form a straw and sludge mixture; fourthly, straw drainage bodies are inserted in the cofferdam; fifthly, the drainage bodies are sleeved with plastic waterproof pile caps; sixthly, a fresh water layer is formed on the surface of the mixture; seventhly, vacuum treatment is performed; and eighthly, the sixth step and the seventh step are repeated so as to finish rapid ecological treatment. By the adoption of the method, the good water permeability of the straw, the straw and sludge mixture and the like is used, and under the assistance of vacuum negative pressure, the salt-leaching and solidification processes of the sludge are accelerated; and meanwhile, the straw can be degraded to improve fertility and the purposes of sludge solidification, salt reduction and fertility improvement are achieved at a time.

Description

technical field [0001] The invention relates to a method for ecological treatment of tidal flats, which belongs to the technical fields of land reclamation, port engineering, tidal flat development and the like. Background technique [0002] A large amount of silt is required to be dredged and filled in projects such as land reclamation and tidal flat development in coastal areas. On the one hand, due to the current dredging by hydraulic means such as cutter suction, the dredged silt has problems such as high water content, high clay content, low strength, and poor drainage performance. Under natural air-drying and consolidation conditions, the silt foundation It usually takes several years to use. On the other hand, the water in the silt produced along the coast is seawater, which contains a lot of salt. When the water evaporates, a lot of salt remains in the soil to form saline soil. The soil fertility is low and cannot be used for a long time for arable land. Therefore...

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Problems solved by technology

[0006] However, in the current patents on coastal silt treatment, it is necessary to divide the silt consolidation treatment, salt reduction, and fertilization into several steps, which is not only complicated, but also takes a long time. There is no reasonable and effective method to reduce the waste process in one with great results

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