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Sludge dewatering additive, and preparation process and application thereof in sludge dewatering

A sludge dewatering and additive technology, applied in water/sludge/sewage treatment, sludge treatment, dewatering/drying/concentrated sludge treatment, etc. The effect of reducing drag, increasing permeability and pore size

Inactive Publication Date: 2017-01-25
河南君和环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic and foreign domestic sewage and industrial wastewater are mostly treated biologically. After dehydration, the solid content of biochemical sludge is only about 20%, which cannot meet the national legal requirement of 40% solid content for clean landfill.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of the sludge dewatering additive of the present embodiment is as follows:

[0023] Take 100 kg of flue gas desulfurization gypsum obtained by sodium-calcium double-alkali desulfurization and air oxidation, add 1.2 kg of anhydrous sodium sulfate, stir and react for 2 hours, and obtain a sludge dehydration additive.

[0024] The method of utilizing the sludge dewatering additive of the present embodiment to carry out sludge dewatering is as follows:

[0025] Add the sludge dehydration additive to the biochemical sludge through the pipeline, the addition amount is 10.2% of the solid content of the biochemical sludge, mix evenly, dehydrate in the plate and frame filter press under the pressure of 0.6MPa, and finally obtain the solid mud cake The content is 52.0%.

Embodiment 2

[0027] The preparation method of the sludge dewatering additive of the present embodiment is as follows:

[0028] Take 100 kg of flue gas desulfurization gypsum obtained by sodium-calcium double-alkali desulfurization and air oxidation, add 2.6 kg of anhydrous sodium sulfate, stir and react for 2 hours, and obtain a sludge dehydration additive.

[0029] The method of utilizing the sludge dewatering additive of the present embodiment to carry out sludge dewatering is as follows:

[0030] Add the sludge dehydration additive to the biochemical sludge through the pipeline, the addition amount is 15.5% of the solid content of the biochemical sludge, mix evenly, dehydrate in the plate and frame filter press under the pressure of 0.8MPa, and finally obtain the solid mud cake The content is 54.5%.

Embodiment 3

[0032] The preparation method of the sludge dewatering additive of the present embodiment is as follows:

[0033] Take 100 kg of flue gas desulfurization gypsum obtained by sodium-calcium double-alkali desulfurization and air oxidation, add 4.8 kg of anhydrous sodium sulfate, stir and react for 2 hours, and obtain a sludge dehydration additive.

[0034] The method of utilizing the sludge dewatering additive of the present embodiment to carry out sludge dewatering is as follows:

[0035] Add the sludge dehydration additive to the biochemical sludge through the pipeline, the addition amount is 19.8% of the solid content of the biochemical sludge, mix evenly, dehydrate in the plate and frame filter press under the pressure of 1.0MPa, and finally obtain the solid mud cake The content is 59.0%.

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Abstract

The invention discloses a sludge dewatering additive, and a preparation process and application thereof in sludge dewatering. The sludge dewatering additive is composed of a solid flue gas desulfurization gypsum and sodium sulfate, wherein the sodium sulfate accounts for 1-5% of the solid flue gas desulfurization gypsum in mass. The preparation method comprises the following steps: sufficiently stirring and mixing the solid flue gas desulfurization gypsum and Na2SO4, and reacting for 2-3 hours to obtain the sludge dewatering additive. The application of the sludge dewatering additive in sludge dewatering is as follows: adding the sludge dewatering additive into biochemical sludge through a pipeline, wherein the addition of the sludge dewatering additive accounts for 10-20% of the solid content of the biochemical sludge; uniformly mixing; and performing dewatering treatment, wherein a plate and frame type filter press is used as a dewatering apparatus. The modified desulfurization gypsum is used to perform dewatering treatment on the sludge, so that waste can be fully utilized; and when the modified desulfurization gypsum is added into the sludge for dewatering treatment, the dewatering property of the biochemical sludge can be favorably improved, thus obviously enhancing the sludge dewatering effect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a sludge dewatering additive, a preparation process thereof and a sludge dehydration method. Background technique [0002] The water in sludge can be divided into four types according to its existing state: ① interstitial water, which is free water surrounded by sludge particles, generally accounting for about 70% of the total water content of sludge; ② capillary water, capillary water is sewage The water between the mud particles or in the particle cracks combined with the sludge particles due to capillary action accounts for about 20% of the total water; ③ Adsorbed water, the adsorbed water is the water adsorbed on the surface of the sludge particles due to the effect of surface tension. Sludge particles are small and have strong surface adsorption; ④Bound water, bound water is the water contained in microbial cells in sludge, and only by changing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/12
CPCC02F11/14C02F11/122
Inventor 代吉华娄威吕林倩梁家伟武彦巍刘飞飞王文涛滕龙孙辉李迅
Owner 河南君和环保科技有限公司
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