Preparation method of oxygen-carrying + adsorption composite functional material and its application in water restoration

Abstract

The present invention provides a preparation method of an oxygen-carrying + adsorption composite functional material and its application in water body restoration. Using the material to repair water bodies can simultaneously efficiently absorb pollutants such as nitrogen and phosphorus in water bodies and improve water body anaerobic problems, and The material has low cost and good ecological safety. The preparation method of the oxygen-carrying + adsorption composite functional material includes the following steps: 1) first impregnating and modifying the base material with a metal cation salt solution, filtering and drying, and then Impregnating and modifying by contacting with an alkaline solution, obtaining a modified matrix material after filtering and drying; 2) granulating the modified matrix material to make granules; 3) calcining the granules at a high temperature of 600-1000°C to obtain Porous granular material; 4) The porous granular material is immersed in oxygen and subjected to pressure swing adsorption-oxygen-carrying treatment, and oxygen is loaded in the pores or on the structure of the porous granular material.

Description

technical field [0001] The invention belongs to the field of environmental science and engineering technology, and specifically relates to a material with composite functions of oxygen carrying and pollutant adsorption prepared by using natural and cheap materials and its application in water environment restoration. Background technique [0002] Water environmental pollution is one of the environmental problems attracting global attention. Even if the input of exogenous pollutants is effectively controlled, the internal source pollution accumulated in the water environment will cause the water body to be polluted for a long time. The oxygen environment exacerbates the risk of release of endogenous pollutants accumulated in the sediment into the water. [0003] Bottom mud, also known as sediment, is an important destination and reservoir for pollutants entering rivers, lakes and other surface water bodies, and is also the internal source of overlying water pollution. Especi...

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Problems solved by technology

Under anaerobic conditions, it will cause the release of endogenous pollutants, including the release of phosphate, iron, manganese, sulfur and other compounds that are sensitive to the redox environment as the dominant pollutants, which will further aggravate the deterioration of water quality and cause water pollution. Continued pollution will accelerate eutrophication and even the outbreak of algal blooms, which in turn will lead to further deterioration of the anaerobic state of the water environment, forming a vicious circle

This vicious cycle of "water quality deterioration - anaerobic water body and bottom - release of endogenous pollutants" not only leads to the decline of aquatic animals and plants, hinders the restoration of water environment, but even threatens the safety of drinking water and human health

[0008] However, there are still technical bottlenecks in the market for the anaerobic bottom of the water environment, especially the anaerobic bottom of the deep water and the anaerobic sediment.

The technologies commonly used in the market to improve bottom anaerobic can be divided into artificial aeration and hydraulic circulation. Artificial aeration includes surface aeration and deep aeration technology. The advantage is that it can quickly increase the dissolved oxygen in the water body, but the disadvantage is that it needs to consume Electric aeration equipment must operate continuously or intermittently. In practical applications, it is only suitable for small water bodies. The cost of large water areas is very high and it is not sustainable. Especially deep aeration often disturbs the sediment, causing a large amount of waste in the sediment Oxygen substances are resuspended, which consumes the oxygen in the water body instead, causing the dissolved oxygen to be lower than before the aeration after the aeration is stopped.

The hydraulic cycle includes two circulation methods, horizontal and vertical, which can exchange the water in the area with high dissolved oxygen and the water in the anaerobic area to improve the anaerobic problem at the bottom, but it often requires the continuous operation of high-power circulating water pumps. Applications are cost prohibitive and inefficient

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