Environment-friendly dredging and curing modification integrated equipment for bottom mud dredging

Abstract

The invention relates to the technical field of bottom mud dredging, and discloses environment-friendly dredging and curing modification integrated equipment for bottom mud dredging, wherein the equipment comprises a sand-water separator; with a cutter suction dredging vessel, bottom mud dredging is achieved under the condition of not constructing a cofferdam, disturbance of traditional water conservancy dredging to natural water is avoided, and release of pollutants in bottom mud to non-flowing water is limited; the environment quality of a water body is comprehensively improved to the maximum extent through ex-situ treatment of the pollutants in water body sediments, according to the technological process of solidification modification treatment and resource utilization of the dredged bottom mud, firstly, impurities in the bottom mud are separated through a vibrating screen so as to protect follow-up treatment equipment; secondly, an organic conditioner is added to improve the water holding performance of the bottom mud, and bottom mud concentration and reduction and enhancement of water holding are achieved; and finally, a dehydration curing agent is added into the concentrated bottom mud, dehydrating and drying are achieved by using mechanical filter pressing equipment, and a dried mud cake is transported outwards for resource utilization.

Description

technical field [0001] The invention relates to the technical field of dredging bottom mud, in particular to integrated equipment for dredging bottom mud for environmental protection and curing and modification. Background technique [0002] The water flow received by urban rivers includes urban surface runoff, domestic sewage and industrial wastewater. The particulate matter and dissolved substances carried in these water flows will settle under certain hydraulic conditions, chemical and biological effects, and turn into water sediments. , during the formation of water body sediments, heavy metals, POPs and other pollutants entering the water body are gathered through a series of physical and chemical actions such as adsorption, complexation, and chemical reactions. When the environmental conditions at the interface between water and sediments change, such as pH changes, redox potential changes, hydraulic disturbances, etc., the pollutants enriched in the sediment will be r...

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Problems solved by technology

[0003] The moisture content of the dredged sediment is usually as high as 90%, and its fluidity is extremely strong. The mechanical properties are poor and it is difficult to meet the relevant requirements for the utilization of building materials. The sediment particles are evenly dispersed in the water and there is almost no mechanical force between them, so it has a low Shear strength, transportation and subsequent utilization are very difficult. The content of heavy metals in the sediment is much higher than the environmental background value. Its high leaching toxicity will cause serious pollution risks to groundwater and soil, and it also limits the utilization of sediment resource products. The scope of use has an extremely adverse impact on the large-scale safe treatment and resource utilization of the bottom sludge. The organic matter content of the bottom sludge is much lower than the remaining sludge of the sewage plant, resulting in poor water holding capacity and high permeability coefficient. The low plasticity index is difficult to meet the relevant index requirements of geotechnical engineering soil

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