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Immobilizing agent for waste sludge from sewage treatment plant and its preparation and application

A sewage treatment plant and immobilization agent technology, applied in the direction of sludge treatment through temperature control, dehydration/drying/thickened sludge treatment, etc., can solve the problems of non-circular conversion, high immobilization operation cost, poor economy, etc., to achieve Effect of reducing moisture content, promoting recycling process, and reducing dosage

Active Publication Date: 2017-10-17
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems existing in the prior art that solidified sludge from sewage treatment plants cannot be recycled and transformed in nature, the immobilization operation cost is high, and the economy is relatively poor, the present invention provides an immobilizing agent for waste sludge from sewage treatment plants and its Preparation and application, the immobilization agent is prepared by mixing calcium-rich clay and waterworks sludge, which can promote the immobilization of sewage treatment plant sludge, reduce the amount of attapulgite clay, reduce the cost of immobilization, and achieve the purpose of treating waste with waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing an immobilizing agent for waste sludge from a sewage treatment plant,

[0042] Select waste mud from Yeshan Sihe Waterworks in Liuhe District, Nanjing City, the content of Fe is 188g / kg, and the content of Al is 94g / kg;

[0043] The undisturbed calcium-based sepiolite clay material in Yixian County, Hebei Province was selected, and its molecular composition is Mg 4 Si 6 o 15 (OH) 2 ·6H 2 O;

[0044] The selected calcium-based sepiolite clay material has a calcium component content of 15%, and the calcium molecular composition is CaMg(CO 3 ) 2 ;

[0045] The particle size of the selected calcium-based sepiolite clay material is 0.15mm;

[0046] Its concrete preparation steps are as follows:

[0047] (1) Collect tailings from Yeshan Sihe Waterworks in Liuhe District, Nanjing, and process them in a high-pressure steam sterilizer at 100°C for 10 minutes to remove bacteria and other harmful substances in the sludge and reduce its moisture conten...

Embodiment 2

[0061] A method for preparing an immobilizing agent for waste sludge from a sewage treatment plant,

[0062] Select the waste mud of Tianmu Lake Waterworks, Tianmu Lake Town, Liyang City, Jiangsu Province, the content of Fe is 215g / kg, and the content of Al is 110g / kg;

[0063] Select the undisturbed calcium-based attapulgite clay material in Xuyi, Jiangsu, whose molecular composition is Mg 5 Si 8 o 20 (OH) 2 (OH 2 ) 4 4H 2 O;

[0064] The selected calcium-based attapulgite clay material has a calcium component content of 20%, and the calcium molecular composition is CaMg(CO 3 ) 2 ;

[0065] The particle size of the selected calcium-based attapulgite clay material is 0.3mm;

[0066] Its concrete preparation steps are as follows:

[0067] (1) Collect tailings from Liyang Tap Water Company in Changzhou, Jiangsu, and process them in a high-pressure steam sterilizer at 150°C for 15 minutes to remove bacteria and other harmful substances in the sludge and reduce its mois...

Embodiment 3

[0081] A method for preparing an immobilizing agent for waste sludge from a sewage treatment plant,

[0082] Select the waste mud of Pantang waterworks in Xuzhou City, Jiangsu Province, the content of Fe is 252g / kg, and the content of Al is 143g / kg;

[0083] Select the undisturbed calcium-based attapulgite clay material in Xuyi, Jiangsu, whose molecular composition is Mg 5 Si 8 o 20 (OH) 2 (OH 2 ) 4 4H 2 O;

[0084] The selected calcium-based attapulgite clay material has a calcium component content of 25%, and the calcium molecular composition is CaMg(CO 3 ) 2 ;

[0085] The particle size of the selected calcium-based attapulgite clay material is 0.5mm;

[0086] Its concrete preparation steps are as follows:

[0087] (1) Collect tailings from Pantang Waterworks in Xuzhou City, Jiangsu Province, and process them in a high-pressure steam sterilizer at 180°C for 20 minutes to remove bacteria and other harmful substances in the sludge and reduce its moisture content; ...

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Abstract

The invention discloses an immobilizing agent for waste sludge of a sewage treatment plant, its preparation and application, and belongs to sludge treatment of sewage treatment plants in environmental protection. The invention is to mix the heat-treated calcium-rich clay with high-efficiency heavy metal fixation capacity and waterworks tailings evenly in a certain proportion under certain temperature and pH ranges, and place them under natural environmental conditions for 8‑10 days , natural weathering to dry. Afterwards, it is mixed with the waste sludge of the sewage treatment plant in a certain proportion, and is used for the adsorption of substances harmful to the environment in the sludge of the sewage treatment plant. The present invention has a strong adsorption effect on heavy metal ions, nutrient salts and other substances, which is beneficial to promote the immobilization of sewage plant sludge; adding water plant sludge can reduce the consumption of attapulgite clay, reduce the cost of immobilization, and achieve The purpose of treating waste. The sludge treated with the immobilizing agent is used in the construction and maintenance of ecological wetlands to realize its cyclic transformation in nature, which has a strong guiding role in the development of sludge treatment and disposal technology in sewage plants.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment in sewage treatment plants in environmental protection, more specifically, it is a method for immobilizing sludge in sewage treatment plants by mixing heat-treated calcium-rich clay materials and tailings from waterworks to prepare immobilizing agents . Background technique [0002] As a by-product of urban sewage treatment, municipal domestic sludge has unique properties, such as high water content, high organic matter content, and also contains a large number of toxic and harmful substances such as pathogens and heavy metals. The properties of sludge from urban sewage treatment plants are complex and very unstable. They are extremely easy to corrode and emit a pungent smell. If they are piled up directly, they will become a living place for pathogenic microorganisms and other harmful bacteria, causing secondary pollution to the environment. Therefore, the treatment and disposal of urba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C02F11/18
Inventor 孔明张毅敏赵玉坤彭福全巫丹杨飞
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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