Porous adsorption materials and oxygen-carrying + adsorption composite functional materials and their applications

Abstract

The invention provides a porous adsorption material, an oxygen-carrying+adsorption composite functional material and their applications. Using the oxygen-carrying+adsorption composite functional material to repair water bodies can simultaneously efficiently adsorb pollutants such as nitrogen and phosphorus in the water body and improve the anaerobic problems of the water body. , and low cost and good ecological security. The composite functional material provided by the present invention is prepared by adopting porous particles made of modified base material through pressure swing adsorption-carrying oxygen, wherein the modified base material is that the base material is successively impregnated with metal cation salt solution and alkaline solution After modification, it is obtained by calcining at a high temperature of 600-1000°C; the matrix material is selected from one or a combination of two or more of natural clay minerals, industrial solid waste and activated carbon.

Description

technical field [0001] The invention belongs to the field of environmental science and engineering technology, and in particular relates to a water body restoration material prepared from 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. Especially when exogenous pollution is effectively cont...

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Problems solved by technology

However, the passivation effect is affected by the pH value and redox state of the water body. When the pH value and redox state change, phosphorus is easily re-released to cause pollution.

At present, the internationally well-known "Phoslock" and other phosphorus fixative technologies use chemically modified clay minerals such as lanthanum and aluminum to cover the bottom mud to achieve the effect of fixing phosphorus in the bottom mud for a certain period of time and preventing it from being released again. This technology cannot effectively improve the anaerobic environment of polluted sediment, and has no effect on pollutants other than phosphorus, such as ammonia nitrogen, organic pollutants, heavy metals, etc., and the cost is very high

[0007] On the other hand, usually in polluted water bodies, due to unfavorable factors such as the reduction of water transparency, the decay and decomposition of organic matter in the bottom mud, including sedimentation algae and plant debris, etc., which consume a large amount of dissolved oxygen, the interior of the water body is often in an anaerobic or anoxic state.

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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