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Method for Improving the Dewatering Performance of Surplus Sludge in Urban Sewage Treatment Plant

A technology for excess sludge and municipal sewage, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/concentrated sludge treatment, etc.

Active Publication Date: 2021-04-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dewatering performance of sludge directly affects the cost and effect of sludge disposal. However, the more economical dehydration treatment method can only reduce the moisture content of the dehydrated sludge cake to 70% to 85%.

Method used

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  • Method for Improving the Dewatering Performance of Surplus Sludge in Urban Sewage Treatment Plant
  • Method for Improving the Dewatering Performance of Surplus Sludge in Urban Sewage Treatment Plant
  • Method for Improving the Dewatering Performance of Surplus Sludge in Urban Sewage Treatment Plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Take 1000mL of remaining sludge sample, its moisture content is 85%, and its sludge specific resistance is 5.864×10 11 m / kg, pH 6.7, with 1mol / L H 2 SO 4 Solution and 10g / L NaOH solution to adjust its pH to 7.0, 1000mL sludge sample was divided into 10 sealed sample bottles with a capacity of 100mL, and each volumetric bottle was filled with 100mL sludge sample. Divide 10 volumetric flasks containing sludge samples into Group 1 and Group 2, 5 in each group, and the 5 volumetric flasks in Group 1 are labeled 1-1, 1-2, 1-3, 1- No. 4 and No. 1-5, in which the 5 volumetric flasks in the second group are respectively marked No. 2-1, 2-2, 2-3, 2-4 and 2-5.

[0017] (2) Add 0.02g of CaTiO with a diameter of 10nm to the sample vials 1-1, 1-2, 1-3, 1-4 and 1-5 of the first group 3 powder and shake it by hand.

[0018] (3) Place the first group of samples and the second group of samples in the central channel of gamma irradiation for irradiation treatment. The irradiation...

Embodiment 2

[0022] (1) Take 1000mL of remaining sludge sample, its moisture content is 85%, and its sludge specific resistance is 5.864×10 11 m / kg, pH 6.7, with 1mol / L H 2 SO 4 Solution and 10g / L NaOH solution to adjust its pH to 10.0, divide 1000mL sludge sample into 10 sealed sample bottles with a capacity of 100mL, and each volumetric bottle contains 100mL sludge sample. Divide 10 volumetric flasks containing sludge samples into Group 1 and Group 2, 5 in each group, and the 5 volumetric flasks in Group 1 are labeled 1-1, 1-2, 1-3, 1- No. 4 and No. 1-5, in which the 5 volumetric flasks in the second group are respectively marked No. 2-1, 2-2, 2-3, 2-4 and 2-5.

[0023] (2) Add 0.02g of CaTiO with a diameter of 10nm to the sample vials 1-1, 1-2, 1-3, 1-4 and 1-5 of the first group 3 powder and shake it by hand.

[0024] (3) Place the first group of samples and the second group of samples in the central channel of gamma irradiation for irradiation treatment. The irradiation time of vo...

Embodiment 3

[0028] (1) Take 1000mL of remaining sludge sample, its moisture content is 85%, and its sludge specific resistance is 5.864×10 11 m / kg, pH 6.7, with 1mol / L H 2 SO 4 Solution and 10g / L NaOH solution to adjust its pH to 7.0, 1000mL sludge sample was divided into 10 sealed sample bottles with a capacity of 100mL, and each volumetric bottle was filled with 100mL sludge sample. Divide 10 volumetric flasks containing sludge samples into Group 1 and Group 2, 5 in each group, and the 5 volumetric flasks in Group 1 are labeled 1-1, 1-2, 1-3, 1- No. 4 and No. 1-5, in which the 5 volumetric flasks in the second group are respectively marked No. 2-1, 2-2, 2-3, 2-4 and 2-5.

[0029] (2) Add 0.02g of CaTiO with a diameter of 100nm to the sample vials 1-1, 1-2, 1-3, 1-4 and 1-5 of the first group 3 powder and shake it by hand.

[0030] (3) Place the first group of samples and the second group of samples in the central channel of gamma irradiation for irradiation treatment. The irradiatio...

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Abstract

The invention provides a method for improving the dehydration performance of excess sludge in urban sewage treatment plants, adjusting the pH value of the excess sludge produced in urban sewage treatment plants to 6.8-7.2, and adding CaTiO to the excess sludge 3 It is then treated with ionizing radiation. The present invention utilizes gamma rays to CaTiO 3 The irradiation of nanomaterials promotes the redox reaction, destroys the sludge floc structure, decomposes the macromolecular substances in the solid phase of the sludge, and leads to the death of microorganisms in the sludge, releases internal bound water, and effectively improves the remaining Sludge dewatering performance.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for improving the dewatering performance of excess sludge in urban sewage treatment plants. Background technique [0002] Excess sludge refers to the activated sludge discharged out of the system from the secondary sedimentation tank (or sedimentation area) in the activated sludge system. Homogeneous body, because it contains a large number of harmful substances such as pathogenic microorganisms, parasite eggs and heavy metals, has a great impact on the environment and needs to be disposed of properly. The main characteristics of excess sludge are high water content, which can be as high as 95%, high organic matter content, and it is difficult to separate solid and liquid by sedimentation. Sludge dewatering is an extremely important link in the whole sludge treatment process, its purpose is to enrich solids, reduce the volume of sludge, and create condi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/15C02F11/145C02F11/12C02F11/00
CPCC02F11/00C02F11/12C02F11/14
Inventor 凌永生费雄辉贾文宝单卿黑大千
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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