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Flocculation technology of activated sludge by pre-dosing of trivalent cations

A trivalent cation, activated sludge technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of large dosage and waste of resources, improve flocculation performance, improve flocculation performance, and save dosage. Effect

Inactive Publication Date: 2014-11-12
李海松 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] 2. Large dosage
After adding trivalent cations at the end to make it chemically flocculate, it is discharged from the sewage treatment system, which causes a waste of resources

Method used

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  • Flocculation technology of activated sludge by pre-dosing of trivalent cations
  • Flocculation technology of activated sludge by pre-dosing of trivalent cations
  • Flocculation technology of activated sludge by pre-dosing of trivalent cations

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Experimental program
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Embodiment Construction

[0033] 1. Control the dissolved oxygen content at the water inlet at 2-3mg / L, and the pH value at 6.8-7.2.

[0034] 2. Keep the activated sludge mixture concentration (MLSS) at about 3000mg / L.

[0035] 3. Through the mesh flocculation mixer (such as figure 1 ) Dosing chemicals into the water, the mesh flocculation mixer is installed at the water inlet port and connected to the external dosing equipment. In the flocculation mixer, grid plates are arranged vertically along the direction of water flow, and along the direction of water flow, 5 grid plates are arranged staggeredly from small to large openings. The opening of No. The plate is 55×55mm, and the No. 5 grid plate is 70×70mm. When the sludge and chemicals pass through the grid, not only can the trivalent cations in the chemicals fully contact and mix with the activated sludge, but also convert part of the energy of the influent into the power of activated sludge flocculation, which plays a certain role in energy dissip...

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Abstract

The invention discloses a flocculation technology of activated sludge by pre-dosing trivalent cations. The traditional coagulation treatment method by tail-end dosing of trivalent cations is improved to a method by pre-dosing at an inflow end. A trivalent cation medicament in the inflow passes through a designed grid flocculation mixer and is fully contacted with activated sludge and is closely combined with activated sludge. By the above mode, DLVO total potential and LB-EPS content of sludge can be reduced remarkably. In addition, the functioning time of trivalent cations is equal to sludge age. Thus, flocculation performance of sludge can be raised remarkably for a long time, and dosage of the trivalent cation medicament can be reduced substantially (the dosage is only one tenth or less than one tenth of dosage by a traditional method).

Description

Technical field: [0001] This technology relates to the sewage process using activated sludge method. The adoption of this technology can significantly improve the flocculation performance of activated sludge, thereby significantly improving the water quality of sewage (including other types of sewage such as domestic sewage and industrial wastewater). [0002] Technical theory: [0003] After a large number of long-term theoretical research and experimental operations by the applicant team (the specific experimental data is given and demonstrated in the accompanying drawings), the following conclusions are obtained, which is sufficient to prove the correctness and feasibility of the present invention. [0004] 1. The total potential energy of sludge DLVO and the content of LB-EPS are important factors affecting the flocculation performance of sludge, while the content of multivalent cations closely combined with sludge is an important factor affecting the total potential energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 李海松代吉华毛圣捷贾晓凤王岩
Owner 李海松