Preparation method of lightweight sediment cover material and river sediment restoration method
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A covering material and sediment technology, applied in chemical instruments and methods, polluted waterways/lakes/ponds/rivers treatment, sludge treatment, etc. Facultative anaerobic environment and other issues
Active Publication Date: 2022-04-22
HUATIAN ENG & TECH CORP MCC +1
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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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[0036] Step 1: Ultrasonic dispersion of 100 parts of activated carbon in 200 ml of water, adding 0.1 g of hyperbranched polyethyleneimine,
[0037] Step 2: The activated carbon dispersion in step 1 is aerated and heated to 90° C. under the condition of an aeration rate of 15 L / min; at the same time, 100 ml of ferrous sulfate solution with a concentration of 0.1 M and 100ml concentration is 0.25M sodium hydroxide solution;
[0038] Step 3: The ferrous sulfate salt and the alkali solution are added dropwise synchronously, and the temperature is kept at 90°C, and the aeration rate is 15L / min, aerated and stirred for 3 minutes;
[0039] Step 4: Magnetic separation, washing with water to neutrality, vacuum drying at 100° C. to constant weight, to prepare magnetic activated carbon adsorption material.
[0040] Manufacturing example of magnetic attapulgite clay adsorption material
[0041] Step 1: Ultrasonic dispersion of 100 parts of attapulgite clay in 200 ml of water, adding 0.1...
Embodiment 1-6
[0046] The preparation of the described lightweight sediment covering material and its manufacturing method comprises the following steps:
[0047] (1) Fully stir and mix cement, hemihydrate gypsum, hydroxypropyl methyl cellulose, magnetic activated carbon, magnetic attapulgite clay, polypropylene fiber, expanded polypropylene, and nano-titanium dioxide according to a certain proportion;
[0048] (2) Add water to the mixture in step (1), stir well and evenly, granulate, the particle size is 5-10mm, and place it under normal temperature and pressure for natural curing for 3-7 days.
[0049] Prepare materials A~F respectively
[0050] Each raw material parameter of embodiment is shown in Table 1
[0051] Table 1
[0052]
[0053] Remarks: Nano-titanium dioxide: prepared as a 10% suspension
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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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