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Magnetic sludge carbon biological filler with core-at-shell structure and preparation method and application thereof

A core-shell structure and biological filler technology, which is applied in sustainable biological treatment, chemical instruments and methods, biological water/sewage treatment, etc. Magnetism, the effect of improving metabolic efficiency

Inactive Publication Date: 2015-10-07
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the low efficiency of existing sewage treatment and technical deficiencies of biological fillers, and to provide a 3 o 4 A method for preparing a sludge carbon biofiller with a core-shell structure from sludge and sludge, specifically involving the use of magnetized Fe 3 o 4 Method for preparing magnetic sludge carbon biological filler with core-shell structure using sludge carbon as core and shell material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1Fe

[0035] Example 1Fe 3 O 4 Sludge carbon (without zinc salts)

[0036] 1. Fe 3 o 4 Preparation of sludge carbon (without zinc salts)

[0037] S1. Preparation of Fe 3 o 4 dry bulb (Fe 3 o 4 magnetic microspheres): Fe 3 o 4 Add magnetic powder to 1-2g / L carboxymethyl cellulose solution, stir evenly, add it into a spherical model and extrude it into Fe with a diameter of 2.5-3.5mm 3 o 4 Balls are dried in a constant temperature drying oven at 80-100°C for 1 hour, and then heated in a charcoal-setting furnace at 400-500°C for 1 hour to form Fe 3 o 4 dry ball;

[0038] S2. Preparation of iron-containing sludge: According to the iron-sludge ratio of 1:1 (calculated as dry sludge), dewatered sludge and 4 mol / L FeSO 4 The solutions are mixed, fully stirred, and then dried in an oven to obtain iron-containing sludge with a moisture content of 90% to 110%.

[0039] S3. Coating the iron-containing sludge of S2 on the Fe of S1 by dipping-drying method 3 o 4 On a dry b...

Embodiment 2F

[0048] Example 2 Fe 3 O 4 Sludge carbon (with zinc salts)

[0049] 1. Fe 3 o 4 Preparation of sludge carbon (containing zinc salts)

[0050] S1. Preparation of Fe 3 o 4 Dry ball: with embodiment 1;

[0051] S2. Preparation of iron-containing sludge: same as Example 1;

[0052] S3. Preparation of zinc-containing sludge: According to the zinc-sludge ratio of 1:1 (calculated as dry sludge), dewatered sludge and 5 mol / L ZnCl 2 The solutions are mixed, fully stirred, and then dried in an oven to obtain zinc-containing sludge with a moisture content of 90% to 110%.

[0053] S4. Coating iron-containing sludge on Fe by dipping-drying method 3 o 4 Fe 3 o 4 Ferrous sludge balls;

[0054] S5. Using repeated dipping-drying method to coat the zinc-containing sludge on the above-mentioned Fe 3 o 4 Iron-containing sludge balls were placed in a carbon-fixing furnace under the protection of 200 ml / min of nitrogen, at a heating rate of 20 °C / min, pyrolyzed at 500-800 °C ...

Embodiment 3

[0063] Embodiment 3 strengthens magnetic Fe 3 O 4 Preparation and Properties of Sludge Carbon

[0064] 1. Enhanced magnetic Fe 3 o 4 Preparation of sludge carbon

[0065] S1. with embodiment 2, prepare the Fe that particle size is about 3.6 mm 3 o 4 sludge carbon;

[0066] S2. the Fe of core-shell structure that step S1 makes 3 o 4 The sludge carbon was pickled, washed, dried and magnetized; the magnetization was to magnetize these magnetic Fe3O4 sludge carbons in a magnetic field of 3000 GS for 30 min to obtain a strengthened magnetic Fe 3 o 4 sludge carbon.

[0067] 2. Enhanced magnetic Fe 3 o 4 Properties of Sludge Carbon

[0068] (1) Enhanced magnetic Fe 3 o 4 The specific surface area of ​​sludge carbon is 365.6 m 2 / g, the saturation magnetization is about 36.3 emu / g.

[0069] (2) The magnetic Fe was measured according to "Test Method for Acid and Corrosion Resistance of Porous Ceramics (GB / T1970-1996)" 3 o 4 The acid resistance of sludge carb...

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Abstract

The invention discloses magnetic sludge carbon biological filler with a core-at-shell structure and preparation method and application thereof. The magnetic sludge carbon biological filler is prepared by using Fe3O4 magnetic microsphere as a magnetic core, iron-containing sludge as an intermediate layer raw material and common sludge or zinc-containing sludge (preferred) as a shell raw material, adopting a repetitive impregnation-drying method to sequentially wrap the intermediate layer raw material and the shell raw material on the Fe3O4 magnetic microsphere to form a precursor of the core-at-shell structure, and then performing pyrolysis and after-treatment. Since the magnetic material is used as the core and the sludge carbon is used as the shell material, the prepared magnetic sludge carbon biological filler with the core-at-shell structure not only can solve the problem that a powder magnetic material is difficult to separate, and can also solve the problem that ferrite used as a magnetic matrix is corroded by microorganisms; the specific surface of the porous sludge carbon in a shell layer is large, a magnetic environment for growth can be provided for more microorganisms, the metabolic efficiency of the microorganisms is improved and the tail water treatment efficiency of domestic sewage plants is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a magnetic sludge carbon biological filler with a core-shell structure and a preparation method and application thereof. Background technique [0002] The magnetic field can cause a series of biochemical reactions in organisms, resulting in biomagnetic effects, which can increase the biological activity of microorganisms in water, accelerate biochemical reactions, and thus increase the efficiency of sewage treatment. For example, studies have shown that the biofilm with magnetic powder as the carrier is denser than the biofilm without magnetic carrier, and its wastewater treatment efficiency is increased by 26%. However, magnetic powder has problems such as difficult separation, difficult regeneration and high cost in water; and magnetic particles generally have the problem of small specific surface area or small adsorption capacity. Corrosion or acid d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/10C02F3/00
CPCY02W10/10
Inventor 熊亚伍志趼田双红
Owner SUN YAT SEN UNIV
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