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Method for activating precipitated sludge and reinforced processing domestic sewage using the same

A technology for domestic sewage and chemical sludge, which is used in flocculation/sedimentation water/sewage treatment, sludge treatment, oxidation treatment of sludge, etc.

Inactive Publication Date: 2005-04-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional enhanced chemical primary treatment method is to directly return the chemical sedimentation sludge to increase the removal rate of organic matter. Although this has a certain effect, it cannot achieve the best effect, and the removal rate of organic matter is relatively low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific embodiment one: the activation method of the chemical precipitation sludge in this embodiment is realized in the following way: a, domestic sewage is injected into the mixing tank, and 2-100mg / L chemical agent is added in the mixing tank; b, sewage and chemical After the reagents are mixed, they are reacted in the reaction tank, and then the substances that can be precipitated in the reaction tank are separated from the mud and water through the sedimentation tank; c. The sedimentation sludge obtained in the sedimentation tank is aerated, and the aeration time is controlled to be 30 to 120 minutes. The dissolved oxygen content is 2-5 mg / L, the pH value is 3.0-8.0, and activated chemical sludge is obtained. The chemical agents are aluminum salts or iron salts.

specific Embodiment approach 2

[0005] Specific embodiment two: This embodiment carries out the chemical strengthening treatment to domestic sewage like this: (one) domestic sewage enters in the mixing tank, adds chemical agent thereinto; Reaction; (3) separating sedimentation material from mud and water through sedimentation tanks, adding activated chemical sludge in the front section of the reaction tank in the (2) process, and the activated chemical sludge is obtained in this way: a, domestic sewage enters To the mixing tank, add 2~100mg / L chemical agent (based on the pure metal salt in the chemical agent) at the mixing tank; b. After the sewage and the chemical agent are mixed, they pass through the reaction tank for reaction, and then the sedimentation in the reaction tank The substances in the sedimentation tank are separated from mud and water; c. Aeration is performed on the sedimentation sludge obtained in the sedimentation tank. The aeration time is controlled to be 30-120 minutes, the dissolved oxy...

specific Embodiment approach 3

[0006] Specific embodiment three: present embodiment carries out chemical strengthening treatment to domestic sewage like this: a, domestic sewage enters in the mixing tank, adds 12mg / L ferric chloride (calculated as iron) at the mixing tank place; b, Sewage and chemicals are mixed and reacted in the reaction tank, and then the sediment produced in the reaction tank is separated from the mud and water through the sedimentation tank; c. The sedimentation sludge obtained in the sedimentation tank is aerated, and the aeration time is controlled to 40 minutes. Dissolved oxygen content is 2~5mg / L, and pH value is 4.0, obtains activated chemical sludge, standby; d, domestic sewage enters in the mixing tank, in mixing tank, add 6mg / L ferric chloride (calculated as iron) ), 10 seconds after the addition of ferric chloride, add 300ml sludge / L sewage activated chemical sludge to the front of the reaction tank, and the precipitated sludge produced by the reaction will be separated from th...

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Abstract

The invention relates to a method to active chemical deposition sludge and the method to use it to reinforced process domestic sewage. The chemical deposition sludge can be gained following the steps: first, pouring the domestic sewage into compound pool and putting chemical into the pool; second, domestic sewage passed reaction pool and taking turbid water separating in the deposition pool; third, aerating the sludge to gain chemical sludge. The method to process domestic sewage is the following steps: pouring sewage into compound pool, reaction pool and deposition pool taking turbid water separating, adding chemical into compound pool and adding chemical sludge into compound pool and reaction pool. The chemical and chemical active sludge has a good synergetic effect. When ferric chloride is 2mg / L, the reinforced removing ratio of turbidity, UV254 and COD is increased about 26.42%, 9.09%, and 11.46%.

Description

Technical field: [0001] The invention relates to an activation method of chemical precipitation sludge and an intensified treatment method for domestic sewage after activation of the chemical precipitation sludge. Background technique: [0002] There are many small and medium-sized cities and towns in my country, with wide distribution, large sewage discharge (accounting for about 70% of the total urban sewage), and lack of funds. Strengthening the primary treatment process has the advantages of saving investment, small footprint, and convenient operation and management. Therefore, Should vigorously develop and strengthen the primary treatment process. At present, the United States, Hong Kong and mainland China have built large-scale and reliable chemically enhanced primary treatment sewage treatment plants. After studying the sewage coagulation treatment of two domestic sewage treatment plants abroad, it is pointed out that the chemically enhanced primary treatment process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F11/00C02F11/06
Inventor 许国仁
Owner HARBIN INST OF TECH