How does UV disinfect electroplating wastewater?
Electroplating can be done in a variety of ways. The wastewater produced differs due to the various electroplating methods.
Pre-treatment wastewater, such as acid and alkali, cyanide-containing wastewater from cyanide copper plating, copper-containing wastewater, nickel-containing wastewater, chromium-containing wastewater, and other heavy metal wastewater are all included in the wastewater discharged by general electroplating companies. A number of electroplating waste liquids are also produced.
For electroplating wastewater containing various types of contaminants, many treatment procedures are available, as follows:
1. Disinfection procedure using UV sterilization of cyanide-containing wastewater (i.e., using an ultraviolet sterilizer).
The alkaline chlorination approach is currently the most established technology for treating cyanide-containing wastewater. To avoid combining with metal ions such as nickel and iron, cyanide-containing wastewater must be kept separate from other wastewaters. Otherwise, treatment will be difficult. The idea behind this technology is to use chlorine-based oxidants in the wastewater under alkaline conditions to degrade and eliminate cyanide.
There are two steps to the therapeutic process.
-The first stage involves converting cyanide to cyanate, which isn't entirely eliminated. The incomplete oxidation stage is what it's termed.
-The complete oxidation stage is the second stage, in which the cyanate is further oxidized and decomposed into carbon dioxide and water.
Flow chart for the treatment process
Cyanide-containing wastewater → conditioning tank → primary cyanide breaking tank → secondary cyanide breaking tank → inclined sedimentation tank → filter tank → callback tank → ultraviolet disinfection equipment (ultraviolet sterilizer or ultraviolet disinfector) → discharge
The treated cyanide-containing wastewater is mixed into the electroplating comprehensive wastewater for treatment together.
2. Chromium-containing wastewater is sterilized with ultraviolet light
The chromium reduction method is used to treat hexavalent chromium-containing wastewater. Under acidic conditions, reducing chemicals such as ferrous sulphate, sodium sulfite, sodium bisulfite, Sulphur dioxide, and others are added to convert hexavalent chromium to trivalent chromium. The pH is then adjusted with sodium hydroxide, calcium hydroxide, lime, and other chemicals, resulting in the precipitation and separation of trivalent chromium hydroxide from the wastewater.
Flow chart for the treatment process
Wastewater containing Cr6+→adjustment tank→ reduction reaction tank→ coagulation reaction tank→ sedimentation tank → filter→ pH callback tank→ discharge
3. A disinfection technique that includes comprehensive ultraviolet sterilization of heavy metal wastewater (i.e., the use of an ultraviolet sterilizer).
Non-complex heavy metal wastewater containing copper, nickel, zinc, and other non-complex chemicals, as well as acid and alkali pre-treatment effluent, make up comprehensive heavy metal wastewater. The process of creating hydroxide precipitation under alkaline circumstances is used for treatment in this sort of wastewater treatment technology, which is quite easy.
Flow chart for the treatment process
Comprehensive heavy metal wastewater → regulating tank → fast mixing tank → slow mixing tank → inclined tube sedimentation tank → filtration → pH callback tank → ultraviolet sterilization equipment (ultraviolet sterilizer or ultraviolet sterilizer) → discharge
4. Treatment of a wide range of electroplating wastewaters UV sterilization is a disinfection procedure that involves the use of a UV sterilizer.
When an electroplating factory produces a wide range of electroplating wastewater, such as cyanide-containing wastewater, hexavalent chromium-containing wastewater, acid-base, heavy metal copper, nickel, zinc, and other comprehensive wastewaters, the wastewater is usually diverted.
First, there are cyanide- and chromium-containing wastewaters. Wastewater from the production line should be collected separately, and cyanide- and chromium-containing wastewater should be treated using the procedures described above. The treated wastewater, together with the coagulation sedimentation process, should be incorporated into the comprehensive wastewater for later treatment.
Flow chart for the treatment process
Cyanide-containing wastewater → regulating tank → primary cyanide breaking tank → secondary cyanide breaking tank → comprehensive wastewater tank
Chromium-containing wastewater → conditioning tank → chromium reduction tank → comprehensive wastewater tank
Comprehensive wastewater → comprehensive wastewater tank → fast mixing tank → slow mixing tank → inclined tube sedimentation tank → intermediate tank → filter → pH callback tank → ultraviolet disinfection equipment (UV sterilizer or ultraviolet disinfector) → discharge
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