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Method and device for removing heavy metals in industrial sewage by electromagnetic stirring paddle

An industrial wastewater, electromagnetic stirring technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. nZVI recycling and other issues, to achieve the effect of low cost, low energy consumption and simple structure

Inactive Publication Date: 2013-04-17
TONGJI UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, using nZVI to treat industrial wastewater is still a new method. It has great application prospects because of its simple operation, short treatment cycle and good treatment effect. Realize solid-liquid separation with water, which affects the turbidity of effluent and the recovery of nZVI. At the same time, most of the reaction devices of nZVI are batch reactors, which cannot realize continuous operation of the device

Method used

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  • Method and device for removing heavy metals in industrial sewage by electromagnetic stirring paddle
  • Method and device for removing heavy metals in industrial sewage by electromagnetic stirring paddle
  • Method and device for removing heavy metals in industrial sewage by electromagnetic stirring paddle

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Embodiment 1

[0036] Such as Figure 1-Figure 7 As shown, the device includes a diversion area 1, a reaction area 2, a precipitation area 3 and a recovery area 4, industrial waste water enters the diversion area 1 through a water inlet pipe 5, and the diversion area 1 communicates with the reaction area 2 through a diversion port 6 , the reaction zone 2 communicates with the precipitation zone 3 through the water outlet 7 . The removal process of heavy metals and the solid-liquid separation process of nZVI mainly take place in the reaction zone 2, wherein: the electromagnetic stirring paddle 8 is the main component of the reaction zone 2, and the effluent of the precipitation zone 3 flows into the overflow type sump 10 through the zigzag weir 9 Finally, the device is discharged through the water outlet pipe 11. When the device needs to be drained for maintenance or nZVI is recovered, the water or nZVI is discharged from the device through the drain port 12, and the electromagnetic stirring ...

Embodiment 2

[0039] The electroplating wastewater stock solution at the outlet of the electroplating workshop of an electroplating factory is taken, and the electroplating wastewater stock solution is firstly pretreated by adding flocculant, so that the suspended impurities in the electroplating wastewater stock solution are removed with the formation of flocculant precipitation, thereby obtaining clarified electroplating wastewater. Pretreated electroplating wastewater containing Cu 2+ 300-800 mg / L, pH value between 7-8.5. In this study, a certain amount of nZVI is added to the pretreated electroplating wastewater in batches. After the pretreated clarified electroplating wastewater enters the reaction area through the diversion port in the diversion area, the diversion port and the water outlet pass through the baffle at the same time. The area is sealed, and under the rapid stirring of the stirring paddle, it can fully contact and react with nZVI for 0.5-2.0 h, so as to realize the remo...

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Abstract

The invention relates to a method and device for removing heavy metals in industrial sewage by an electromagnetic stirring paddle. The method comprises the steps that the industrial sewage after the pretreatment is fully mixed with nano zero-valent iron, a part of the heavy metals in the industrial sewage is reduced by n ZVI, a part of the heavy metals is absorbed on the surface of the n ZVI, after a reaction, clean water and n ZVI are separated through an electromagnetic stirring paddle device, the n ZVI containing the heavy metals is absorbed by a magnetic field acting force sent by the electromagnetic stirring paddle after energized, so that the n ZVI can be fixed on the electromagnetic stirring paddle to be effectively separated. The change for physicochemical property of the industrial sewage during the removing process or after the removing can be reduced through physical separation. According to the invention, the operation is simple, the effect is remarkable, the heavy metals such as zinc, copper, nickel, cadmium, lead and the like which exist in sewage can be removed once, and then the heavy metals absorbing on the n ZVI are recycled and separated through the electromagnetic stirring paddle. The n ZVI technology which is utilized to treat the sewage polluted by the heavy metals has the characteristics of low cost, high treating efficiency and the like; and the electromagnetic stirring paddle device is used to recycle resources, so that the secondary pollution is prevented.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the purification technology of heavy metals in industrial wastewater, in particular to a method and a device for removing heavy metals in industrial wastewater by using an electromagnetic stirring paddle. Background technique [0002] Industrial wastewater is a kind of wastewater that is extremely harmful to the environment and human beings. The main pollution factors are zinc, copper, nickel, cadmium or lead. Heavy metals are difficult to be degraded, they can only transfer their existing positions or change their physical and chemical forms. Industrial wastewater is mainly produced in mechanical processing, electroplating, mining, etc. The types, contents and forms of heavy metals vary with different production industries. For example, printing plants produce acidic waste water containing lead and zinc in the process of iron plating and galvanizing. The electro...

Claims

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Application Information

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IPC IPC(8): C02F9/12
Inventor 张亚雷张伟贤代朝猛梁文
Owner TONGJI UNIV
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