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Method for deodorizing sludge with metal salt and tannin extract, deodorizing sludge and application thereof

A technology of metal salts and sludge, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problem of tannin extract and other problems that are not recognized, achieve improved dehydration and drying performance, and a wide range of sources. , the effect of low cost

Active Publication Date: 2022-07-29
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above invention patents only focus on the role of tannin extract in improving the dewatering performance of sludge, but do not realize that tannin extract with polyphenolic hydroxyl structure can inhibit the formation of malodorous substances in sludge, and has a certain potential for deodorization of sludge
On the other hand, ammonia, hydrogen sulfide, methyl mercaptan, methyl sulfide, carbon disulfide and other odors will still appear in the sludge treated by the technical method of the above-mentioned invention patent application in the subsequent resource utilization process such as incineration, pyrolysis or carbonization. The problem of toxic and harmful substances such as odor gas and dioxin needs to be properly resolved

Method used

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  • Method for deodorizing sludge with metal salt and tannin extract, deodorizing sludge and application thereof
  • Method for deodorizing sludge with metal salt and tannin extract, deodorizing sludge and application thereof
  • Method for deodorizing sludge with metal salt and tannin extract, deodorizing sludge and application thereof

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Embodiment 1

[0038] The present embodiment provides a method for removing the odor of sludge with metal salts and tannin extract, comprising the following specific steps:

[0039] First, put 9320 parts of the sludge to be deodorized from domestic sewage into the stirring device, control the reaction temperature to 25 ° C, then add 100 parts of the metal salt treatment solution, turn on the stirrer and stir at a speed of 120 r / min for 1 hour to make it well mixed. Then, 500 parts of tannin extract treatment solution and 80 parts of pH adjuster were mixed and added to the stirring device. The pH was controlled to 6.2 and stirred at a speed of 120r / min for 3 hours. After standing for 12 hours, the odor in the sludge could be effectively removed. . In this embodiment, the metal salt treatment solution is an aqueous solution of ferrous sulfate with a mass percentage of 2.5%, the tannin extract treatment solution is an aqueous solution of bayberry tannin extract with a mass percentage of 50%, a...

Embodiment 2

[0041] The present embodiment provides a method for removing the odor of sludge with metal salts and tannin extract, comprising the following specific steps:

[0042] First, put 9910 parts of the sludge to be deodorized from industrial wastewater into the stirring device, control the reaction temperature to 60 ° C, then add 20 parts of the metal salt treatment solution, turn on the stirrer and stir at a speed of 15r / min for 1h to make it well mixed. Then 50 parts of tannin extract treatment solution and 20 parts of pH adjuster were mixed and added to the stirring device, and the pH was controlled to 7.5 and stirred at a speed of 15r / min for 2 hours. After standing for 12 hours, the odor in the sludge could be effectively removed. . In this embodiment, the metal salt treatment solution is an aqueous solution of aluminum sulfate with a mass percentage of 0.5%, the tannin extract treatment solution is an aqueous solution of myrica tannin extract with a mass percentage of 5%, and...

Embodiment 3

[0044] The present embodiment provides a method for removing the odor of sludge with metal salts and tannin extract, comprising the following specific steps:

[0045] First, put 9780 parts of the sludge to be deodorized from the urban sewage treatment plant into the stirring device, control the reaction temperature to 40 ℃, then add 100 parts of the metal salt treatment solution, turn on the stirrer and stir at a speed of 90r / min for 1h, Mix it well. Then, 100 parts of tannin extract treatment solution and 20 parts of pH adjuster were mixed and added to the stirring device. The pH was controlled to 7.5 and stirred at a speed of 90r / min for 2 hours. After standing for 12 hours, the odor in the sludge could be effectively removed. . In this embodiment, the metal salt treatment solution is an aqueous solution of ferrous sulfate with a mass percentage of 2.5%, the tannin extract treatment solution is an aqueous solution of bayberry tannin extract with a mass percentage of 10%, an...

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Abstract

The invention belongs to the technical field of sludge treatment, and more particularly relates to a method for deodorizing sludge with metal salts and tannin extract, deodorizing sludge and applications thereof. The invention provides a sludge deodorization technology with high treatment efficiency, environmental friendliness, low investment cost and meeting the harmless requirements of subsequent incineration, pyrolysis or carbonization and other resource utilization. Taking advantage of the rich phenolic hydroxyl groups in tannin extract, it is used as a polybasic ligand to undergo complex reaction with metal ions, reducing the bioavailability of proteins and other macromolecules, and effectively inhibiting the production of low-volatile sulfides. Significantly remove the stench generated during the two processes of sludge standing and combustion. The whole deodorization process of the invention is simple and feasible, flexible in operation, does not require complex and harsh reaction conditions and expensive equipment, low operating cost, and can be used as a matching pretreatment technology for resource utilization such as sludge incineration, pyrolysis or carbonization.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and more particularly relates to a method for deodorizing sludge with metal salts and tannin extract, deodorizing sludge and applications thereof. Background technique [0002] Sludge is an inevitable product of sewage treatment plants in the process of treating domestic and industrial wastewater. It is characterized by a large amount of production and complex components. It contains a large number of pathogenic microorganisms, heavy metals and organic matter, and is easily corrupted and smelly. Sludge that has not been properly and safely treated is likely to cause harm to soil, water sources and even human bodies through the food chain after re-entering the environment. Moreover, proper and reasonable treatment and utilization of sludge can make it "turn waste into treasure", resulting in a huge amount of waste. Ecological, economic and social benefits. At present, the use of concentr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/147
CPCC02F11/00C02F11/147C02F2303/02Y02A50/20C02F11/148
Inventor 刘明华林剑涛姜疏雨杨宇川周郁欣刘以凡
Owner FUZHOU UNIV
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