Treatment method for high-organic-matter bottom mud and application of water solution of high-organic-matter bottom mud

Abstract

The invention discloses a treatment method for high-organic-matter bottom mud and application of a water solution of the high-organic-matter bottom mud. The treatment method comprises the following steps: (1) conveying high-organic-matter bottom mud into a pipeline after dredging; (2) feeding a strong alkali solution into a first pipeline, and enabling the strong alkali solution to sufficiently contact and react with the dredging bottom mud by using a static mixer; (3) feeding a flocculant solution into a second pipeline, and enabling the flocculant solution to sufficiently react with the dredging bottom mud in the pipeline by using the static mixer; (4) conveying the dredging bottom mud reacted in the step (3) into a vacuum pre-pressurized water reduction tank for dehydration volume reduction, and performing resource utilization on the dredging bottom mud after dehydration volume reduction. By adopting the treatment method, bottom mud dredging, alkali treatment, a flocculant and a vacuum pressurizing technique are combined with one another, so that the dredging bottom mud treatment capacity is large, a small space can be occupied, the process is simple, and the water content of the treated dredging bottom mud is remarkably reduced; due to the application, the resource utilization rate can be increased as a water solution containing humic acid is recycled to process composite chemical fertilizers.

Description

technical field [0001] The invention relates to the treatment of bottom mud in oceans, rivers and waterways, in particular to a treatment method for high organic matter bottom mud and the application of the aqueous solution obtained by dehydration and volume reduction in the treatment. [0002] technical background [0003] The treatment of dredged sediment is a worldwide problem. There is a certain amount of organic matter in the dredged sediments of oceans, lakes, and rivers. According to statistics (article number 1000-7598-(2008)01-0033-04), the average variation range of organic matter content in sediments in different regions and years in Taihu Lake is 0.68% to 1.9%, and the highest value can reach more than 10%. The content of organic matter in the bottom sediment of Hangzhou West Lake is abnormally high, and the average content in different regions reaches 20%. 6% and 2% to 9% and so on. It is an effective resource recycling method to treat dredged sediment by solid...

AI Technical Summary

Problems solved by technology

However, the inhibitory effect of organic matter on dehydration and solidification is not considered, and the useful substance humic acid in dredging mud is not able to be used twice, so it is difficult to achieve higher economic benefits

Patent Publication No. CN101693590B proposes a method for the treatment of heavy metal sediment. The sediment is dredged through the combination of heavy metal chelating agent and flocculant geobag technology, which solves the problem of heavy metal secondary pollution while dehydrating and reducing capacity. However, this method A large number of sites are required and the situation where this method is applicable is relatively special, and the applicability is not great

Another example is the utility model patent 200520044977.X, which discloses a dredging cutter head device that reduces the dispersion of sediment, and transports the dredged mud through a sealed pipeline to solve the problem of secondary pollution, but does not further treat the high content of organic matter in the dredged mud

[0005] At the same time, in the prior art, when the vacuum preloading technology is generally used to dewater and reduce the volume of the dredged sediment, because the particle diameter of the dredged sediment is relatively small, the phenomenon of clogging of the drainage plate often occurs, resulting in a decrease in drainage efficiency; and when mixing strong alkali The mechanical equipment used in the solution or flocculant has a large capital investment and high operating costs

There is still a considerable gap in the technology for the treatment of high organic matter sediment. The inhibitory effect of organic matter on sediment consolidation has not been properly resolved. The recovery and reuse efficiency of humic acid, the main component of organic matter, has not been able to maximize economic benefits.

[0006] In summary, there are still deficiencies in the existing technology, and there is a large technical vacuum in the treatment of high organic matter sediment.

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