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Electromagnetic coagulation treatment method

A treatment method and coagulation technology, which are applied in the fields of flocculation/sedimentation water/sewage treatment, magnetic field/electric field water/sewage treatment, etc., which can solve the problems of high water content, large volume, and slow floc formation in sedimentation sludge.

Inactive Publication Date: 2011-06-29
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a large amount of coagulant, and the sedimentation sludge has high moisture content, large volume, slow floc formation speed, and low sedimentation speed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Treat raw water: Yellow River water, turbidity is 680NTU

[0011] Coagulant: 2% polyferric sulfate (PFS) solution

[0012] Coagulation conditions and equipment: laboratory standard coagulation mixing conditions, intelligent coagulation experimental mixer

[0013] ① Take the coagulant solution directly for coagulation experiment, the optimal dosage is 60mg / l, the turbidity of the precipitated water is 5.88NTU, and the moisture content of the sludge is 91.4%;

[0014] ② Install a magnetization device on the coagulant dosing tube to magnetize the coagulant solution in the electromagnetic device (magnetic field strength 44.6mT, magnetization time 5min), and then carry out coagulation experiments. The optimal dosage is 40mg / l, and the precipitation The water turbidity is 1.66NTU, and the moisture content of the sludge is 87%;

[0015] ③The magnetized coagulation effect is significantly better than the non-magnetized coagulation effect (the turbidity is reduced by 4.22NTU),...

Embodiment 2

[0018] Treat raw water: Yellow River water, turbidity is 700NTU

[0019] Coagulant: 7% rare earth coagulant solution (PRC)

[0020] Coagulation conditions and equipment: laboratory standard coagulation mixing conditions, intelligent coagulation experimental mixer

[0021] ① Take the coagulant solution directly for coagulation experiment, the optimal dosage is 28mg / l, the turbidity of the precipitated water is 4.32NTU, and the moisture content of the sludge is 78.6%;

[0022] ② Install a magnetization device on the coagulant dosing tube to magnetize the coagulant solution in the electromagnetic device. The optimum magnetic field strength is 60.1mT, and the magnetization time is 6min. l, the turbidity of sedimentation water is 3.51NTU, and the moisture content of sludge is 75%;

[0023] ③The effect of magnetized coagulation is significantly better than that of non-magnetized coagulation (the turbidity is reduced by 0.81NTU), the dosage can be reduced by 25%, the moisture conte...

Embodiment 3

[0026] Raw water treatment: secondary sedimentation tank of municipal sewage plant, turbidity is 6NTU, COD is 68mg / l

[0027] Coagulant: polyferric sulfate (PFS) solution, polyaluminum chloride (PAC) solution, rare earth coagulant solution (PRC)

[0028] Coagulation conditions and equipment: laboratory standard coagulation mixing conditions, intelligent coagulation experimental mixer

[0029] ① Take coagulant solution directly for coagulation experiment;

[0030] ② Take the coagulant solution and magnetize it in the electromagnetic device, and then carry out the coagulation experiment.

[0031] ③ Due to the low turbidity of raw water, there is no significant difference in dosage, turbidity of sedimentation water and COD removal rate

[0032] However, the effect of magnetization is better than that of non-magnetization; it is observed that the formation rate of magnetized flocs is fast and dense, the sedimentation performance is good, and the sludge volume is very small.

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Abstract

The invention relates to an electromagnetic coagulation treatment method, and belongs to the field of coagulation treatment of water. According to the invention, a prepared coagulant solution is magnetized through an electromagnetic device and then added to a mixing reaction tank to be coagulated. The coagulant solution prepared at a certain concentration is magnetized by the electromagnetic device through a chemical dosing device and then added to mixing equipment to be mixed, and then a flocculation reaction, sedimentation and subsequent treatment are conducted on the coagulant solution. Under the circumstance that other conditions are the same, when being compared with the coagulation effect of an un-magnetized coagulant solution, the coagulation effect of the magnetized coagulant solution is that the best chemical dosing quantity can be reduced by 25 percent to 35 percent, the sludge moisture content is reduced by 3 percent to 5 percent, the sludge volume can be reduced by 15 percent to 40 percent; and meanwhile, the flocculating constituent forming speed is increased, the sludge sedimentation speed is increased, the flocculation time and the sedimentation time are shortened, the chemical dosing quantity and the sludge volume are greatly reduced, and subsequent sludge transportation and treatment costs are greatly reduced.

Description

technical field [0001] The invention relates to an electromagnetic coagulation treatment method, which belongs to the field of water coagulation treatment. Background technique [0002] At present, the coagulation treatment of water is generally to prepare a coagulant solution with a certain concentration, and directly add it to the mixing equipment through the dosing device and mix it for flocculation reaction, precipitation and subsequent treatment. This method uses a large amount of coagulant, and the sedimentation sludge has high moisture content, large volume, slow formation speed of flocs, and low sedimentation speed. Contents of the invention [0003] The purpose of the present invention is to provide an electromagnetic coagulation treatment method with good coagulation effect, less coagulant dosage, fast settling speed, low sludge water content and small sludge volume in the water treatment process. [0004] Technical solution: [0005] In the present invention, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/48
Inventor 延克军李光芝敬双怡史冬雪
Owner INNER MONGOLIA UNIV OF SCI & TECH
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