Magnetic separation device and method for treating oily sludge

A magnetic separation device and sludge technology, applied in sludge treatment, fertilization equipment, biological sludge treatment, etc., can solve the problems of unstable operation, large differences, long cycle, etc., and achieve good degreasing effect and wide application range Wide, easy-to-operate effects

Inactive Publication Date: 2018-12-14

BINZHOU UNIV

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AI-Extracted Technical Summary

Problems solved by technology

[0003] Oily sludge is generally a stable suspoemulsion system composed of oil-in-water (o/w), water-in-oil (w/o) and suspended solids. The dehydration effect is poor, and the sludge composition and physical properties are affected by sewage water quality, treatment process, Influenced by factors such as dosing agents, the differences are large, the treatment is difficult, and the oil content varies greatly. Some of them have the value of recycling and reuse, and the oily sludge contains PAHs, heavy metals and ot...

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Method used

A kind of magnetic separation device, comprises magnetic roller 1 and the shell 2 outside magnetic roller 1, and described magnetic roller 1 comprises cylindrical rotating shaft 3 and the helical fin 4 that surrounds rotating shaft 3, and described rotating shaft 3 and helical An electromagnet 5 is arranged in the fin 4, and the electromagnet 5 is connected to a power supply (not shown in the figure), and the rotating shaft 3 is connected to the motor 7 outside the housing 2 through the transmission rod 6; the housing 2 is close to the motor One end of 7 is provided with sludge inlet 8, and one end far away from motor 7 is provided with sludge outlet 9. The thickness of the spiral fin 4 is 3cm. The magnetic...

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Abstract

The invention relates to a sludge treatment method and device, and particularly relates to a magnetic separation device and a method for treating oily sludge. The magnetic separation device comprisesa magnetic roller and a shell outside the magnetic roller; the magnetic roller comprises a cylindrical rotating shaft and spiral fins surrounding the rotating shaft; an electromagnet is arranged inside the rotating shaft and the spiral fins; the electromagnet is connected with a power supply; the rotating shaft is connected with a motor outside the shell through a transmission rod; one side, closeto the motor, of the shell is provided with a sludge inlet; and one side, away from the motor, of the shell is provided with a sludge outlet. The method for treating the oily sludge comprises the following steps: adjusting the pH value of the oily sludge to be treated to 10-12; adding a magnetizing agent, and uniformly carrying out stirring; carrying out treatment by using the magnetic separationdevice; sending discharged sludge to a filter press for dewatering; and then, carrying out fermentation to prepare an organic fertilizer. According to the invention, cutting, uniform mixing and grease adsorption are carried out continuously in a process of conveying the sludge, and the oil removal effect is good.

Application Domain

Sludge treatment by de-watering/drying/thickeningClimate change adaptation +2

Technology Topic

Organic fertilizerSludge +4

Image

Examples

Experimental program(2)

Example Embodiment

[0028] Example 1

[0029] A magnetic separation device, comprising a magnetic roller 1 and a housing 2 outside the magnetic roller 1, the magnetic roller 1 includes a cylindrical rotating shaft 3 and a helical fin 4 surrounding the rotating shaft 3, the rotating shaft 3 and the helical fin 4 An electromagnet 5 is provided inside, and the electromagnet 5 is connected with a power supply (not shown in the figure), and the rotating shaft 3 is connected to the motor 7 outside the housing 2 through the transmission rod 6; A sludge inlet 8 is provided, and a sludge outlet 9 is provided at one end away from the motor 7 . The thickness of the spiral fin 4 is 3cm. The magnetic roller 1 is 2 cm away from the lower shell 2 and 8 cm away from the upper shell 2 . The magnetic roller 1 is at a certain distance from the casing 2, which is beneficial to the throwing and mixing of the sludge in the casing under the action of the rotation of the magnetic roller, which is beneficial to improving the treatment efficiency. The magnetic roller 1 is connected with a controller 10 .

[0030] The casing 2 is provided with a plurality of purge ports 11 , and the purge ports 11 are connected to an air compressor 13 through a delivery pipe 12 . The purge port 11 is provided with a protective net 14, which can prevent the purge port 11 from being blocked. The sludge inlet 8 is provided with a valve 15 .

[0031] During operation, first start the power supply of the motor 7 and the electromagnet 5, open the valve 15 of the sludge inlet 8, and send the oily sludge added with a magnetizer into the housing 2, and the sludge will flow on the magnetic rotating shaft 3 and the spiral fin. Under the action of sheet 4, it is continuously cut, thrown, and mixed, and absorbs the magnetic aggregates (grease) therein, and is continuously pushed forward to the sludge outlet 9 under the action of rotating shaft 3. After the device runs for a while, close the sludge inlet 8 valve 15, turn off the electromagnet 5 power supply, keep the motor 7 running normally, start the air compressor 13, use the purge port 11 to purge the rotating shaft 3 and the spiral fin 4, and blow the air The grease and magnetizing agent swept down are discharged and collected from the sludge outlet 9.

Example Embodiment

[0032] Example 2

[0033] A method of treating oily sludge, comprising:

[0034] (1) The pH value of the oily sludge to be treated is adjusted to 11.5;

[0035] (2) Add Fe to the oily sludge obtained in step (1) 3 o 4 , and stir evenly;

[0036] (3) The oily sludge obtained in step (2) is processed with the magnetic separation device described in Example 1;

[0037] (4) The sludge discharged from the magnetic separation device is sent to the filter press for dehydration;

[0038] (5) Ferment the dehydrated sludge to make organic fertilizer.

[0039] The oily sludge with a water content of 88% and an oil content of 10% was treated according to the above steps. The control group was directly dehydrated by a filter press, and the water content, oil content, etc. of the treated sludge were measured respectively. The data are as follows :

[0040] Table 1 Comparison of treatment effects

[0041]

[0042] From the above experimental results, it can be seen that the device and method of the present invention can be used to treat oily sludge, and the treatment effect is better than that of direct filter press dehydration, and the oily sludge treated by the present invention can be reused, and the recovered grease can be reused. The mud can also be reused. Compared with the previous methods such as dehydration first and then incineration, the utilization rate of resources is improved, and it will not cause secondary pollution.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Good degreasing effect
Easy to operate

Magnetic separation device and method for treating oily sludge

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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