Science and technology is a double-edged sword, the 20th century since the rapid development of science and technology, promote the development of the economy, improve people's standard of living, however, at the same time, mankind has paid a heavy price for all kinds of environmental pollution, heavy metal wastewater refers to the mining and metallurgy, machinery manufacturing, chemical industry, electronics, instrumentation and other industrial production processes. Heavy metal-containing wastewater discharged. Heavy metal (such as cadmium, nickel, mercury, zinc, etc.) wastewater is one of the most serious pollution of the environment and the most harmful industrial wastewater to human beings, and its water quality and water quantity and production process. Heavy metals in wastewater generally can not be decomposed and destroyed, but only to transfer its location and change its physical form. Treatment is the first reform of the production process, do not use or less toxic heavy metals, in the production site in situ treatment (such as not discharged from the production plant) often use chemical precipitation, ion exchange method, etc. for treatment, treatment of heavy metals in the water below the emission standards can be discharged or reuse. Formation of new heavy metal concentration products as far as possible recycling or harmless treatment.
How to treat the heavy metal wastewater for non-polluting discharge, and even recycling, which depends on the integration of wastewater treatment equipment to help, Changzhou Guangbiao Technology Co., Ltd. in response to this environmental issue, specializing in the development of research on special environmental protection equipment, the next step is for me to give you an introduction to the principle of integrated wastewater treatment equipment for the treatment of heavy metal wastewater.
Heavy metals in wastewater is a variety of commonly used methods can not be decomposed and destroyed, but only to transfer their presence and transform their physical and chemical form. Heavy metal wastewater after treatment to form two kinds of products, one is basically removed from the heavy metal of the treated water, one is the heavy metal of the concentrated product.
Heavy metal wastewater treatment methods can be divided into two categories:
One is to make the wastewater in the dissolved state of heavy metals into insoluble heavy metal compounds or elements, by precipitation and flotation from the wastewater removal, can be applied to neutralization and precipitation, sulfide precipitation, flotation separation, ion flotation, electrolytic precipitation or electrolytic flotation, diaphragm electrolysis, etc.;
The second is the heavy metals in the wastewater in the insoluble state of heavy metals. Second, the heavy metals in wastewater without changing its chemical form under the conditions of concentration and separation, can be applied to reverse osmosis, electrodialysis, evaporation, ion exchange method. The treatment principle is as follows:
1) Electrolysis:
Widely used in the treatment of heavy metal wastewater containing cyanide. Electrolytic oxidation to decompose the cyanide and heavy metals to form hydroxide precipitation to remove cyanide and heavy metals in wastewater. Mercury sulfide waste can be treated by electrolysis to efficiently recover pure mercury or mercury compounds.
2) flotation method:
The heavy metal hydroxides and sulfides in wastewater can also be removed by gas flotation, which is most effective in pressurized dissolved gas flotation method. Electrolytic flotation method can effectively deal with a variety of heavy metal wastewater, especially wastewater containing heavy metal complexes.
3) Ion flotation method:
Heavy metal wastewater into the anionic surfactants, such as sodium xanthate, sodium dodecylbenzene sulfonate, gelatin, and so on, and the heavy metal ions to form surface-active complexes or chelates. Different surfactants for different metal ions or the same surfactant in different pH and other conditions for different heavy metal ions with selective complexation, so that the heavy metals in the wastewater can be separated by flotation.
4) membrane method
Mainly electrodialysis and reverse osmosis. Electrodialysis is characterized by the concentration of a limited number of times, subject to multi-stage electrodialysis treatment, in order to concentrate the useful substances in the wastewater to the extent that can be reused. Reverse osmosis is used to deal with nickel plating, copper plating, galvanizing, cadmium plating and other electroplating rinse wastewater.
After treatment of heavy metal wastewater, still can not meet the discharge requirements, you can directly cast heavy metal capture agent treatment. The agent has fast reaction speed, excellent treatment effect, suitable for heavy metal wastewater post-treatment, is a good auxiliary treatment agent.
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