Cation montmorillonite sludge dehydrant as well as preparation method and application thereof

A sludge dehydrating agent, montmorillonite-type technology, applied in the direction of dehydration/drying/concentration sludge treatment, oxidation treatment sludge, etc., can solve the limitation of Fenton reaction sludge dehydration, sludge weight gain and reduce sludge heat Value, impact on sludge resource utilization and other issues, to achieve good application value and promotion potential, good variety of properties, huge specific surface area effect

Inactive Publication Date: 2019-01-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of these substances added, the ratio of the added amount to the sludge dry matter is 6-30:10, which not only increases the weight of the sludge significantly but also reduces the calorific value of the sludge, thus affecting the subsequent recycling of the sludge use
[0003] The classic Fenton reaction has many shortcomings due to the limitation of reaction conditions, such as Fe 3+ Accumulation, strict control of Fe 2+ with H 2 o 2 Severely limit the practical application of Fenton reaction to sludge dewatering

Method used

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  • Cation montmorillonite sludge dehydrant as well as preparation method and application thereof
  • Cation montmorillonite sludge dehydrant as well as preparation method and application thereof
  • Cation montmorillonite sludge dehydrant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the preparation of dehydrating agent

[0033] (1) Mix 100 parts by weight of montmorillonite, 600 parts by weight of deionized water, 1.5 parts by weight of CTAB, and 100 parts by weight of absolute ethanol at room temperature, stir with a constant temperature magnetic stirrer at 60°C for 24 hours, and then cool to room temperature.

[0034] (2) The mixed solution is placed in an 8000rpm / min centrifuge for 5 minutes, and the centrifuged solid material is repeatedly washed with deionized water until no bromide ions exist in the eluate (use AgNO 3 Titrate the eluate until no white precipitate is formed).

[0035] (3) The remaining solid matter was dried in a vacuum drying oven at 110°C for 12 hours. After the material was cooled, it was ground through a 200-mesh sieve, and the powder material was saved for later use. The prepared material was named MMT-CTAB 0.5 .

Embodiment 2

[0036] Embodiment 2: the preparation of dehydrating agent

[0037] (1) Mix 100 parts by weight of montmorillonite, 600 parts by weight of deionized water, 3 parts by weight of CTAB, and 100 parts by weight of absolute ethanol at room temperature, stir with a constant temperature magnetic stirrer at 60°C for 24 hours, and then cool to room temperature.

[0038] (2) The mixed solution is placed in an 8000rpm / min centrifuge for 5 minutes, and the centrifuged solid material is repeatedly washed with deionized water until no bromide ions exist in the eluate (use AgNO 3 Titrate the eluate until no white precipitate is formed).

[0039] (3) The remaining solid matter was dried in a vacuum drying oven at 110°C for 12 hours. After the material was cooled, it was ground through a 200-mesh sieve, and the powder material was saved for later use. The prepared material was named MMT-CTAB 1 .

Embodiment 3

[0040] Embodiment 3: the preparation of dehydrating agent

[0041] (1) Mix 100 parts by weight of montmorillonite, 600 parts by weight of deionized water, 6 parts by weight of CTAB, and 100 parts by weight of absolute ethanol at room temperature, stir with a constant temperature magnetic stirrer at 60°C for 24 hours, and then cool to room temperature.

[0042] (2) The mixed solution is placed in an 8000rpm / min centrifuge for 5 minutes, and the centrifuged solid material is repeatedly washed with deionized water until no bromide ions exist in the eluate (use AgNO 3 Titrate the eluate until no white precipitate is formed).

[0043] (3) The remaining solid matter was dried in a vacuum drying oven at 110°C for 12 hours. After the material was cooled, it was ground through a 200-mesh sieve, and the powder material was saved for later use. The prepared material was named MMT-CTAB 2 .

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Abstract

The invention discloses a cation montmorillonite sludge dehydrant as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) fully grinding montmorillonite; (2) uniformly mixing the montmorillonite, deionized water, CTAB (Cetyl Trimethyl Ammonium Bromide) and ethanol proportionally, stirring the mixture for 18 to 24 hours at a constant temperature under the action of magnetic force, and cooling the mixture to room temperature; (3) centrifuging the mixture prepared in step (2), and repeatedly cleaning the centrifuged solid substance with the deionized water till the eluate is free from bromide ions; (4) drying the solid substance cleaned in step (3) in vavuum at the temperature of 80 to 110 DEG C for 8 to 12 hours, and grinding the solid substance after the solid substance is cooled to obtain the sludge dehydrant. By adopting the method, the modified montmorillonite is taken as a carrier, and meanwhile H2O2 is added, so that waterin the sludge can be efficiently removed. Meanwhile, the efficient running of a Fenton reaction can be catalyzed without adding exogenous ferrite.

Description

technical field [0001] The invention belongs to the field of sludge dewatering agents, and in particular relates to a preparation method of a cationic montmorillonite-type advanced oxidation sludge dewatering agent for sludge dewatering and a sludge dewatering method thereof. Background technique [0002] Due to the electronegative characteristics of sludge, there is a relatively stable state between sludge flocs and it is difficult to flocculate and settle, thus affecting the sludge dewatering performance. PAM is used as a conventional polymer cationic sludge dewatering agent. Due to its electropositive property and the adsorption of long polymer chains, it can reduce the Zeta potential of sludge and cause flocculation and sedimentation of sludge to improve the dewatering performance of sludge. However, the refractory and biological toxicity of PAM limit the wide application of PAM. As a cationic surfactant, CTAB (cetyltrimethylammonium bromide) can reduce sludge SRF by re...

Claims

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Application Information

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IPC IPC(8): C02F11/14C02F11/06
CPCC02F11/06C02F11/14
Inventor 朱能武李敏婷尹富华吴平霄
Owner SOUTH CHINA UNIV OF TECH
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