A method for treating complex metal ion wastewater

Abstract

The invention relates to the technical field of metal ion wastewater and in particular relates to a method for treating complex metal ion wastewater. The method comprises the following steps: (1) enabling the wastewater to pass through a microfiltration treater at a high speed under the action of a high-pressure pump of 1.5-4.5MPa to separate out fresh water and concentrated water; (2) treating the fresh water separated in the step (1) by use of a nanofiltration membrane for further separation, and feeding the concentrated water into a filter pressing system for solid-liquid separation; (3) performing two-stage purification on the fresh water separated by the nanofiltration membrane by use of a reverse osmosis purifier, and performing repeated concentration on the concentrated water separated by the nanofiltration membrane in the step (2) by additionally arranging a precision filter device in front of a nanofiltration concentrator; and (4) extracting metal ions from the concentrated water separated by the nanofiltration membrane in the step (3) by use of the filter pressing system. The method for treating the complex metal ion wastewater has no requirement on addition of any chemical substance and is simple in process, and as a result, the extraction of the complex metal ions and the recycling of the water resource are well realized; the obtained purified water is up to the standards of drinking water.

Description

Technical field: [0001] The invention belongs to the field of metal ion wastewater treatment, and particularly relates to a physical method for cleaning equipment and products in circuit boards, flexible electromagnetic shielding fabrics, non-ferrous metal smelting, electronics, electroplating and surface treatment workshops, which are relatively dirty and cannot be returned. A method for treating complex metal ion wastewater used in the production line. Background technique: [0002] At present, chemical precipitation, ion exchange and membrane treatment are mainly used for metal ion treatment, but these methods have certain application ranges and limitations. The chemical precipitation method occupies a large area, consumes a large amount of chemicals, and causes serious pollution. And the stability is poor, the treatment capacity of the ion exchange method is limited and the regeneration is troublesome, and the membrane treatment method is easy to block the membrane, freq...

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Problems solved by technology

[0002] At present, chemical precipitation, ion exchange and membrane treatment are mainly used for metal ion treatment, but these methods have certain application ranges and limitations. The chemical precipitation method occupies a large area, consumes a large amount of chemicals, and causes serious pollution. And the stability is poor, the treatment capacity of the ion exchange method is limited and the regeneration is troublesome, and the membrane treatment method is easy to clog the membrane, frequent replacement, and high cost

[0003] In order to overcome the shortcomings of large floor space, high cost and cumbersome process in the existing treatment methods, the present invention adopts a physical treatment method of complexed metal ions, which not only has simple equipment, small floor space, and does not need to add chemical substances , to achieve the extraction of complex metal ions and the recycling of water resources

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