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Composite material for rehabilitating river channel sludge as well as preparation method and application of composite material

A composite material and sludge technology, applied in sludge treatment, river remediation, biological sludge treatment, etc., can solve problems such as long repair period, re-contamination of aquatic plants and microorganisms, and achieve low cost and significant effect

Active Publication Date: 2017-02-15
NINGBO DAHONGYING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, bioremediation has obvious limitations, mainly including long repair period, greater influence by uncontrollable environmental factors, corruption and decomposition of aquatic plants and microorganisms may re-pollute water bodies, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add commercially available diatomite powder (purchased from Shengzhou Huali Diatomite Products Co., Ltd.) to 40 mg / L FeCl 2 In the solution, the solid-to-liquid ratio was 1:10 (mass ratio). After stirring for 4 hours, it was centrifuged, and the obtained solid was washed 4 times with deionized water, and then dried at 105°C to obtain iron-modified diatomite.

[0037] Mix 50g of calcium peroxide, 40g of iron-modified diatomite and 10g of copper oxide, then ball mill in a ball mill for 40 minutes, and pass through a 30-mesh sieve. The obtained mixed powder is the composite material for repairing river sludge.

[0038] Sprinkle 100g of the above composite material on an area of ​​0.5m 2 The surface of the river sludge (5kg in weight) was sprinkled for 5 hours and slowly added with 50kg of water. After another 6 hours, the metal ions, lead and cadmium, organic matter and total phosphorus in the water were measured. Class II water standard.

Embodiment 2

[0040] Add commercially available diatomite powder (purchased from Shengzhou Huali Diatomite Products Co., Ltd.) to 20 mg / L FeCl 2 In the solution, the solid-to-liquid ratio was 1:5 (mass ratio). After stirring for 3 hours, it was centrifuged, and the obtained solid was washed 3 times with deionized water, and then dried at 105°C to obtain iron-modified diatomite.

[0041] Mix 70g of calcium peroxide, 20g of iron-modified diatomite and 10g of copper oxide, then ball mill in a ball mill for 20 minutes, and pass through a 20-mesh sieve. The obtained mixed powder is the composite material for repairing river sludge.

[0042] Sprinkle 100g of the above composite material on an area of ​​0.5m 2 The surface of the river sludge (5kg in weight) was sprinkled for 5 hours and slowly added with 50kg of water. After another 6 hours, the metal ions, lead and cadmium, organic matter and total phosphorus in the water were measured. Class II water standard.

Embodiment 3

[0044] Add commercially available diatomite powder (purchased from Shengzhou Huali Diatomite Products Co., Ltd.) to FeCl with a concentration of 30 mg / L 2 In the solution, the solid-to-liquid ratio was 1:8 (mass ratio). After stirring for 4 hours, it was centrifuged, and the obtained solid was washed 4 times with deionized water, and then dried at 105°C to obtain iron-modified diatomite.

[0045] Mix 50g of calcium peroxide, 30g of iron-modified diatomite and 20g of copper oxide, then ball mill in a ball mill for 40 minutes, and pass through a 30-mesh sieve. The obtained mixed powder is the composite material for repairing river sludge.

[0046] Sprinkle above-mentioned 100g above-mentioned composite material on area be 0.5m 2 The surface of the river sludge (5kg in weight) was sprinkled for 5 hours and slowly added with 50kg of water. After another 6 hours, the metal ions, lead and cadmium, organic matter and total phosphorus in the water were measured. Class II water standa...

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Abstract

The invention discloses a composite material for rehabilitating river channel sludge as well as a preparation method and application of the composite material. The composite material comprises the following components by weight percent: 50%-70% of calcium peroxide, 20%-40% of iron-modified diatomite and 10%-20% of copper oxide. The preparation method comprises the steps of mixing the three components, carrying out ball milling for 20-40 minutes, and sieving by virtue of a 20-30-mesh sieve. The composite material is scattered to the surface of the river channel sludge according to a standard that 150g-250g of the composite material is scattered to 1m<2> of the river channel sludge, the components in the composite material react in water and can be mutually promoted, and heavy metal ions and phosphate in the river channel sludge can be effectively fixed by virtue of a synergistic effect of physical absorption and chemical reaction, and microorganisms and organic pollutants in the river channel sludge can be rapidly degraded, so that the effects of rehabilitating the river channel sludge and purifying a water body are obvious. Furthermore, the composite material is environmentally friendly and low in cost, and the secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a composite material for repairing river sludge, a preparation method and application thereof. Background technique [0002] In recent years, the rapid economic development has led to the discharge of a large number of refractory pollutants into water bodies. Due to the shallow and relatively static characteristics of urban river water bodies, a considerable part of pollutants are deposited in the river bottom mud, and can re-enter the water body through the exchange of water and mud interfaces. This process is particularly prominent after exogenous pollution is effectively controlled. River bottom mud is a site for natural purification of many environmental pollutants. It is a collection of various pollutants. Pollutants are adsorbed, complexed, flocculated, and settled by water particles and deposited in the bottom mud. On the other hand, river bottom mud is also a...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/02E02B3/02C02F101/30C02F101/20
CPCC02F11/00C02F11/02C02F11/06C02F2101/105C02F2101/20C02F2101/30C02F2103/007C02F2209/22C02F2305/023C02F2305/026E02B3/02Y02A20/402
Inventor 刘岚蔡鲁祥
Owner NINGBO DAHONGYING UNIV
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