Electroplating wastewater treatment is a long-standing problem for electroplating enterprises. The components of electroplating wastewater contain heavy metal ions such as chromium, cadmium, nickel, copper, zinc, gold, silver, and cyanide, which are highly toxic and cannot be degraded by simple biochemical methods. Some pollutants are highly toxic substances that cause cancer and mutagenesis. The physical and chemical treatment process is relatively simple, and the treatment cost is high. It is recognized in the industry as a highly difficult wastewater to treat
Wastewater contains complexing agents, and conventional physical and chemical methods are difficult to treat heavy metals and phosphorus to meet standards
Difficulties: Chemical nickel wastewater treatment is difficult and costly
Using the dilution method to enter the wastewater station will result in excessive discharge of heavy metals and phosphorus at the end high outsourcing treatment costs
Preheating
The water pump generates vacuum when running, and water automatically enters the evaporator. The compressor generates heat when running to heat the wastewater in the evaporator. Under vacuum, the wastewater temperature rises and begins to evaporate, and preheating is completed.
Evaporation and concentration process
The evaporation temperature is set to 35-40℃. The compressor compresses the refrigerant to generate heat. While the water evaporates quickly, the refrigerant absorbs heat and refrigerates after being vaporized by the expansion valve. The vapor rises and meets the cold liquid to liquefy and enter the water storage tank. The refrigerant absorbs heat and is compressed and heated by the compressor to reheat the wastewater. If bubbles rise during the evaporation process, the sensor detects it and the defoamer is automatically added to defoam. After one cycle is completed, the concentrate begins to be discharged (the time of one cycle can be set).
Concentrate discharge
After one evaporation cycle is completed, the compression pump stops working, the pneumatic valve of the concentrate pipeline opens, the evaporator is pressurized, and the concentrate is pressed into the concentrate barrel.
Background
The customer is a high-tech enterprise specializing in the research and development of electroless nickel plating surface treatment technology. Chemical nickel wastewater was originally outsourced, producing 5T of wastewater per day, about 3800 yuan /T, and the disposal cost is high
Solution
After the use of our low-temperature evaporator, the waste water directly into our LT-5T low-temperature evaporator, the total monthly treatment of 150T, concentrated 70% of the waste liquid, evaporated clear liquid directly discharged into the sewage station, the remaining part of the sludge after disposal, greatly reducing outsourcing costs, saving about 4.05 million yuan annually.
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