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A process and device for removing heavy metal ions in sewage by pressurized dissolved air flotation

A technology of heavy metal ions and pressurized dissolved gas, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. , the low efficiency of removing heavy metals, etc., to achieve the effect of improving the technical content, realizing the reuse of resources, and improving the efficiency of sewage treatment

Inactive Publication Date: 2016-08-24
KUNMING UNIV OF SCI & TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is complicated to operate, requires harsh conditions, and has low efficiency in removing heavy metals
[0005] The Chinese invention patent with publication number CN102126801A introduces a process and equipment for processing heavy metal ions. The processing equipment is expensive, the entire process is relatively complicated, prone to failure, and the stability of the entire process is not high. In addition, the water quality after treatment , cannot ensure compliance with emission requirements

Method used

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  • A process and device for removing heavy metal ions in sewage by pressurized dissolved air flotation
  • A process and device for removing heavy metal ions in sewage by pressurized dissolved air flotation
  • A process and device for removing heavy metal ions in sewage by pressurized dissolved air flotation

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Embodiment 1

[0029] The technical process of removing heavy metal ions in waste water by pressurized dissolved air method described in this embodiment includes the following steps, such as figure 1 Shown:

[0030] In this example, waste water from Huize, Yunnan Province is used as the treatment object, and the waste water mainly contains pb 2+ , Zn 2+ , algae and other substances of which pb 2+ , Zn 2+ The contents were 1.5mg / L and 3.2mg / L respectively.

[0031](1) First pass calcium hydroxide into the wastewater at a ratio of 1.5g / L to neutralize the acidic ions in the wastewater, and then introduce sodium oleate at a ratio of 25mg / L to make the formed precipitate hydrophobic and achieve The wastewater was pretreated, and the pH value was adjusted to 8.5 with calcium carbonate, and the residence time was 60 min.

[0032] (2) Compressed air and return water are made into high-pressure dissolved air water.

[0033] (3) Pass the high-pressure dissolved air water into the pretreated was...

Embodiment 2

[0041] In this embodiment, waste water from Chihong, Yunnan is used as the treatment object, and the waste water mainly contains Zn 2+ , algae and other substances in which Zn 2+ 、Cd 2+ The contents were 4.5mg / L and 2.5mg / L respectively.

[0042] The simultaneous desulfurization, denitrification and demercuration dry flue gas purification process described in this embodiment includes the following steps:

[0043] (1) First pass calcium hydroxide into the wastewater at a ratio of 40kg / t to neutralize the acid ions in the wastewater, and then introduce sodium oleate at a ratio of 120kg / t to make the formed precipitate hydrophobic and achieve The wastewater was pretreated, and the pH value was adjusted to 10 with calcium carbonate, and the residence time was 60 min.

[0044] (2) Compressed air and return water are made into high-pressure dissolved air water.

[0045] (3) Pass the high-pressure dissolved air water into the pretreated wastewater obtained in step (1) according t...

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Abstract

The invention discloses a process and a device for removing heavy metal ions in sewage by a pressurized dissolved air flotation method, and belongs to the field of environmental engineering treatment. In this process, calcium hydroxide is first introduced into the wastewater to neutralize the acidic ions in the wastewater, and then sodium oleate is introduced to hydrophobize the formed precipitate, and then the particles are flocculated; The saturated dissolved air water generated after pressurization is released into the flocculated sewage for flotation; finally, the flotation scum is collected and treated. The process is a pressurized dissolved air flotation purification process, with simple process, convenient operation and continuous operation.

Description

technical field [0001] The invention relates to a process and a device for removing heavy metal ions in sewage by a pressurized dissolved air flotation method, belonging to the field of environmental engineering water treatment. Background technique [0002] Heavy metal pollutants mainly include mercury, cadmium, lead, copper, chromium, arsenic, nickel, iron, manganese, zinc, etc. Their pollution to the natural environment is basically an irreversible process. At present, the treatment technologies for heavy metal wastewater mainly include precipitation methods (hydroxide precipitation method, sulfide precipitation method, reduction precipitation method and flocculation flotation precipitation method), physical methods (activated carbon method, reverse osmosis method and ion exchange method), physical and chemical methods. method (adsorption method, solvent extraction method, liquid membrane method, electrodialysis method, ion flotation method), electrochemical treatment tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 龙威凌在帅吴张永魏镜弢张晓龙莫子勇
Owner KUNMING UNIV OF SCI & TECH
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