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
CN104118951BInactive Publication Date: 2016-08-24KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Publication Date
2016-08-24
Estimated Expiration
Not applicable · inactive patent

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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.
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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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