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Deep purification and recycling method for waste water containing heavy metal ions

A heavy metal ion and deep purification technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve problems such as difficult treatment, achieve good treatment effect, convenient operation, and simple process

Inactive Publication Date: 2015-10-14
广西冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is often easier to treat wastewater containing one heavy metal, and it can be treated according to its characteristics, but it is relatively difficult to treat wastewater containing multiple heavy metal ions, such as smelting wastewater, electroplating wastewater, ore dressing wastewater, etc.

Method used

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  • Deep purification and recycling method for waste water containing heavy metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The wastewater quality of a lead-zinc enterprise is as follows: the advanced treatment capacity is 500m 3 / d

[0021] project

pH

Zn

Pb

Cu

CD

As

Actual mg / L

2.0～5.4

80～120

2～8

0.5～3.0

1～3

0.5～3.0

[0022] (1) will contain Zn 2+ , Pb 2+ 、Cu 2+ 、Cd 2+ 、As 3+ Wastewater such as heavy metal ions is measured by the electromagnetic flowmeter and discharged into the mixing reaction tank. Add 5-10% lime milk or quicklime, stir for not less than 15 minutes, make the pH of the solution reach 6-8, flow into the sedimentation tank, and then add non-ionic Type polypropylene amine flocculant, the amount of flocculant added is 10-30mg / L, most of the heavy metal ions in the wastewater are converted into heavy metal hydroxides and precipitated by neutralization and precipitation, after the mud and water are separated, the effluent from the sedimentation tank is sent to the next step Wastewater treatment system....

Embodiment 2

[0028] The wastewater quality of a lead-zinc enterprise is as follows: the advanced treatment capacity is 500m 3 / d

[0029] project

pH

Zn

Pb

Cu

CD

As

Actual mg / L

2.0～4.8

75～112

2～8

0.6～2.8

1～3

0.8～3.0

[0030] (1) will contain Zn 2+ , Pb 2+ 、Cu 2+ 、Cd 2+ 、As 3+ Wastewater such as heavy metal ions is measured by the electromagnetic flowmeter and discharged into the mixing reaction tank. Add 5-10% lime milk or quicklime, stir for not less than 15 minutes, make the pH of the solution reach 6-8, flow into the sedimentation tank, and then add non-ionic Type polypropylene amine flocculant, the amount of flocculant added is 10-30mg / L, most of the heavy metal ions in the wastewater are converted into heavy metal hydroxides and precipitated by neutralization and precipitation, after the mud and water are separated, the effluent from the sedimentation tank is sent to the next step Wastewater treatment system....

Embodiment 3

[0036] The wastewater quality of a lead-zinc enterprise is as follows: the advanced treatment capacity is 500m 3 / d

[0037] project

pH

Zn

Pb

Cu

CD

As

Actual mg / L

2.0～4.4

90～120

2.5～7.8

0.5～3.5

1～3.5

0.5～3.0

[0038] (1) will contain Zn 2+ , Pb 2+ 、Cu 2+ 、Cd 2+ 、As 3+Wastewater such as heavy metal ions is measured by an electromagnetic flowmeter and discharged into the mixing reaction tank, adding 5-10% lime milk or quicklime, stirring for not less than 15 minutes, making the pH of the solution to 6-8, flowing into the sedimentation tank, and then adding polymeric sulfuric acid Iron flocculant, the amount of flocculant added is 1.5g / L. Most of the heavy metal ions in the wastewater are converted into heavy metal hydroxides and precipitated by neutralization and precipitation. After the mud and water are separated, the effluent from the sedimentation tank is sent to the next step of wastewater treatmen...

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Abstract

The invention relates to a deep purification and recycling method for waste water containing heavy metal ions. The deep purification and recycling method comprises the following steps: performing chemical neutralization and sedimentation on the waste water containing one or more heavy metal ions to remove most heavy metal ions in water; adding dimethyl carbamodithioic acid or potassium dimethyldithiocarbamate and a polymer flocculating agent, and fundamentally removing the heavy metal ions in the waste water through coagulation sedimentation; adopting sand filtration, ultrafiltration and nanofiltration units to treat effluent water after sedimentation, removing suspended substances, SS, organic matters and partial heavy metal ions in the waste water, wherein the water quality reaches the water quality recycling standard of circulating cooling water after treatment. The waste water containing one or more heavy metal ions at different concentrations can be treated, the application range is large, the operation is simple, and the removal rate is high.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for deep purification and recycling of wastewater containing heavy metal ions. technical background [0002] Heavy metal pollutants are a typical class of priority pollutants. The pollution and harm of heavy metals in the environment depend on the content distribution, chemical characteristics, environmental chemical behavior, migration and transformation of heavy metals in the environment, and the toxicity of heavy metals to organisms. Heavy metal pollution mainly comes from industry, agriculture, cities and pollution accidents. The mining, smelting, processing and commercial manufacturing activities of heavy metals are increasing day by day, the use of heavy metals is becoming more and more widespread, and the pollution of heavy metals is becoming more and more serious. become an urgent worldwide issue. [0003] At present, the general methods used to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 容继范庆丰韦真周戴伟明覃用宁陶媛刘晨何航军满露梅李婷唐海明慕江容王瑶
Owner 广西冶金研究院有限公司
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