Preparation method of lightweight sediment cover material and river sediment restoration method

Abstract

The invention relates to a preparation method of a lightweight bottom mud covering material and a river bottom mud restoration method. Its components and parts by weight: 100 parts of inorganic binder, 0.1-10 parts of organic binder, 100-1000 parts of magnetic adsorption material, 0.1-10 parts of reinforcing fiber, 0.5-5 parts of expanded particles, and 0.1 parts of catalytic material ‑10 servings. Each component is made by mixing, granulating and natural curing. The prepared covering material has a particle size of 5-50mm and is slightly alkaline, which is beneficial to improve the acidic microenvironment of the sediment; it has a large specific surface area and strong adsorption capacity, especially for phosphorus; it has high strength and is not easy to break; it is light and durable The specific gravity is controllable to achieve the best coverage effect; it is beneficial to promote the growth of microorganisms to form a film, and improve the effect of long-term inhibition of sediment and water purification. The bottom mud covering material and its manufacturing process are simple, low in cost and suitable for large-scale production and application.

Description

technical field [0001] The invention belongs to the field of water environment treatment, and in particular relates to a preparation method of a lightweight bottom mud covering material and a river bottom mud restoration method. Background technique [0002] The bottom mud of rivers and lakes is an important reservoir of pollutants. The main pollutants accumulated are heavy metals, nutrients such as N and P, and refractory organic matter. The content can reach hundreds of times that in the water body, and maintain a certain dynamic balance with the water phase. When environmental conditions change, pollutants in the sediment may be released and re-contaminate the water body. Therefore, polluted bottom sludge has seriously threatened human health and the world's environment, and the treatment of polluted bottom sludge is urgent. [0003] At present, the control technologies of polluted sediment mainly include in-situ treatment technology and ex-situ treatment technology. Th...

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Problems solved by technology

However, most of the current masking materials are inorganic sandstone, which has a wide range of sources and low cost, but it has a large proportion, is easy to fall into the sediment and is covered by the sediment, has a small specific surface area, poor adsorption performance, is not conducive to the growth of microorganisms, and has a slow growth rate. , and easy to fall off, non-functional, easy to cause anaerobic or facultative anaerobic environment, unable to achieve long-term inhibition of sediment pollutant release and water quality improvement effect

CN 102617089A reports the covering material prepared by cement curing material, but the alkalinity is too strong, which will cause secondary pollution to the water body, and the specific surface area is small, the adsorption is poor, the specific gravity is large, the requirement for the bearing capacity of the bottom mud is high, and the bottom mud is easy to deposit , can not play a covering role

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