electroplating wastewater features
Electroplating wastewater has become the focus of attention in the field of environmental protection due to its large discharge, complex composition, and high hazard characteristics.
The electrolysis method is to generate hypochlorite through the electrolysis of sodium chloride. The principle is the same as that of the alkaline chlorination method. Installation of cyanide-containing copper-containing electroplating wastewater system The existing cyanide-containing copper-containing electroplating wastewater treatment process is complex, the pollutants are difficult to remove, the amount of sludge is large, the copper is difficult to recover, and the cost is high. We first used the alkaline chlorination method to preliminarily remove the free cyanide ions and partially complexed cyanide in the electroplating wastewater; then adjusted the pH value to strong alkalinity to selectively convert the copper ions in the electroplating wastewater into easy-to-use The precipitate separated by flotation, and then use sodium hypochlorite to further oxidize complex copper ions and complex cyanide, and destroy the copper and cyanide ions complexed with organic matter through oxidation, makes the ions in the complex state become free, and the copper ions in the free state are precipitated and converted into precipitates that are easy to be separated by flotation under strong alkaline conditions. The oxidation of sodium hypochlorite can remove part of the free cyanide; then Select a suitable sediment collector to increase the hydrophobicity of the sediment surface, and use a two-stage flotation recovery process to flotate copper ions, grease, phosphorus, etc. Phosphorus and other substances; the residual complex cyanide that is difficult to remove in the wastewater after flotation treatment, and then use ferrous sulfate to form insoluble complex cyanide precipitation for advanced treatment.
installation and testing matters when the diaphragm differential pressure transmitter measure the cyanide-containing copper-containing electroplating wastewater
1. It should be installed in a ventilated, dry, non-corrosive, cool place with small temperature changes. For example, if it is installed in the open air, it is necessary to add a protective cover to avoid direct sunlight and rain, so as to avoid product performance degradation or failure.
2. It is strictly forbidden to knock, impact, disassemble, and use strong clamping or poke pressure holes or metal diaphragms with sharp instruments.
3. Before installing the pressure transmitter, read the product manual carefully, wire it correctly, and pay attention that the product must not have wiring errors.
4. When measuring liquid medium, the air in the pipeline must be drained with a shut-off valve before pressurization to prevent the sensor from being overloaded due to the high pressure generated by the compressed air.
5. It is forbidden to use the overloaded indicator.
6. Attention should be paid to the protection of the cables leading out of the product, and the cable joints must be sealed to prevent water or moisture from affecting the performance and life of the whole machine.
7. When measuring steam or other high temperature medium, be careful not to make the working temperature of the transmitter exceed the limit. If necessary, add a pressure pipe or other cooling device to connect.
8.When the pressure transmitter is installed, a pressure shut-off valve should be installed between the transmitter and the medium in order to maintain and prevent the pressure port from being blocked and affecting the measurement accuracy. In the occasions where the pressure fluctuation range is large, a pressure buffer device should be installed.
9.When the explosion-proof transmitter is used in dangerous places, the cover of the transmitter must be tightened. In order to ensure the safety of use, the safety regulations should be strictly followed, and it is forbidden to open the cover of the transmitter during power-on.
