A sediment passivation system suitable for aquatic ecological reconstruction and its construction technology

Abstract

The invention discloses a bottom mud passivation system suitable for aquatic ecological reconstruction. The bottom mud passivation system comprises a lower layer, a middle layer and an upper layer, wherein the lower layer, the middle layer and the upper layer are sequentially connected from bottom to top. The lower layer is a mineralizer powder layer, the middle layer is an elastic porous continuous material layer, and the upper layer is a porous high-intensity material layer. After the scheme is adopted, the ecological bottom mud passivation technology is adopted in the bottom mud passivation system, compared with a traditional bottom mud passivation and bottom mud closure technology, most of bottom mud pollutants can be passivated and guided, sludge accumulated on the upper portion is easy to clean and pump and permeates into the bottom mud along with a reagent thrown later on easily for further bottom mud disposal, strong and long-term waterflow scouring can be resisted, and the bottom mud passivation system can adapt to non-cracking damage such as bottom mud compression and geology vibration, and is beneficial for survival and reproduction of microorganisms, aquatic plants and benthonic animals. The implementing technology is pioneered, substances verified to be safe through nature observation are selected for materials of the reagent, and the implementing technology can be transplanted to other underwater engineering and used for construction.

Description

technical field [0001] The invention relates to the technical field of water body pollution endogenous treatment engineering, in particular to a sediment passivation technology suitable for aquatic ecological reconstruction. Background technique [0002] Sediment is the sink and endogenous source of water pollutants. Usually, in addition to migrating to other ecosystems, most of the soluble substances in the sediment eventually enter the air through mineralization and form carbon sinks and insoluble minerals such as phosphate and pyrite. , gypsum and other patterns into the formation. Due to human activities and natural disasters, it is often necessary to intervene in the migration path and rate of pollutants. Sediment dredging, chemical passivation, physical closure, and in-situ biological digestion are currently the four main types of engineering technologies for internal source disposal of water pollution. [0003] At present, the mainstream passivation technology is to ...

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Problems solved by technology

[0014] 1. From an ecological point of view, a common feature of traditional sediment passivation technologies is that they are all pure chemical reactions and physical covering behaviors, without fully considering the migration pathways, thermodynamics and kinetic behaviors of pollutants, and not fully considering Ecological construction and connection in the core area of ​​pollution source-buffer area-diffusion area

[0015] Soluble aluminum, iron, and calcium salts will have a great impact on the pH value and salinity of the water body after being put into the water body, which will bring corresponding ecological risks to the water body, and it is difficult to control due to changes in the hydrological status of the water body. The above problems are more serious when the amount is used to prolong the time of phosphorus fixation

If clay minerals modified by calcium, iron, aluminum, and lanthanum are used, the suspended solids in the water body will exceed the standard by a large amount, the effective chemical components for fixing phosphate ions will be less, and the dosage of the agent will be significantly increased. At the same time, the thickness and density It may lead to the accumulation of sediment fermentation gas that cannot be discharged smoothly, and increase the pressure diffusion behavior of various soluble pollutants in the sediment

In addition, aluminum salt passivation has the possibility that aluminum ions are leached out by complex organic acids generated by microbial activities to inhibit microbial activity, which may slow down the mineralization rate of sediments, which is not conducive to the natural digestion of sediments. Sediment ecological risk

[0016] The existing passivation technology does not take into account the migration of multiple species such as greenhouse gases, soluble organic matter, and ammonia nitrogen; nor does it take into account whether the sediment layer after passivation is suitable for the reconstruction of algae-aquatic higher plant ecosystems, and does not really solve the problem

[0017] 2. From the geotechnical point of view, the above sediment passivation method has poor physical sediment compression effect, especially for thick floating mud layers

[0023] 4. The passivation layer must have a certain self-healing ability;

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