Copper-containing wastewater treatment method and device

Abstract

The invention relates to a copper-containing wastewater treatment method and device. The method includes the steps thatradioactivecopper-containing wastewater, a basic cupric carbonateseed crystal and sodium carbonate in a mechanical stirring reactor react chemically through mechanical stirring, and a precipitate is deposited on the surface of seed crystal basic cupric carbonate to form large-particle dense crystal particles which fast precipitate on the bottom of the mechanical stirring reactor to remove most of copper ions; a small-particle precipitate and a seed crystal enter a membrane separator along with a supernate, and particulate matter is separated through a hollow fiber membrane to further remove the copper ions, so that the copper content of outlet water is substantially reduced. The particulate matter formed in the method is large in particle size, compact in structure and high in settling property, effectively overcomes the defects that a chemical precipitation method is large in sludge output and precipitates are poor in settling property, and increases the concentration multiple of copper treatment without causing serious membrane pollution, and the copper-containing wastewater treatment method is economical and practical.

Description

technical field [0001] The invention relates to a treatment technology for copper-containing wastewater, specifically to remove copper ions from wastewater. Background technique [0002] Copper resources are widely distributed on the earth, and copper metal has many applications in industry. In recent years, with the development of copper mining, metal processing, machinery manufacturing and other industries, the dramatic increase in industrial activities and the large discharge of industrial wastewater have led to increased pollution of heavy metal copper in the environment. Copper can enter water bodies and soils and cause harm to the ecological environment and human body. Excessive copper intake in humans can lead to severe mucosal irritation and corrosion, stomach upset and ulcers, liver and kidney damage, chronic copper poisoning, and brain damage. No matter from the perspective of ecological environment safety or human health, copper is a harmful heavy metal. Theref...

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Problems solved by technology

Quartz sand is usually added as a seed crystal, and sodium carbonate is added as a precipitant. However, the dosage of sodium carbonate determines the removal rate of copper to a certain extent. If the dosage of sodium carbonate is too low, there is not enough carbonate to react with copper. The effect of copper is not good, the dosage is too high, resulting in the increase of pH value and the formation of flocculent precipitated copper hydroxide

[0005] Most of present research, although can control the mol ratio of sodium carbonate and copper (the ratio of the concentration of sodium carbonate in the reaction and the concentration of copper ion) at certain value makes in inducing crystallization reaction fully generate crystal and improve sediment performance, but The effluent still cannot meet the standard of 1.0mg / L for drinking water in my country (GB5749-2006)

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