Industrial electroplating wastewater treatment equipmentWhen treating electroplating wastewater, a variety of treatment methods are usually used to ensure that harmful substances in the wastewater are effectively removed and meet environmental emission standards or recycling standards. The following are some commonly used treatment methods and their brief introductions:
Chemical precipitation method:
The chemical precipitation method is to add chemical agents to the wastewater to react with the heavy metal ions in the wastewater to generate insoluble precipitates, and then separate the precipitates from the wastewater through precipitation, filtration and other steps. This method is simple and easy to operate, with high treatment efficiency, but the amount of sludge produced is large and requires further treatment.
Oxidation-reduction method:
The oxidation-reduction method is a method of converting harmful substances in wastewater into harmless substances using oxidants or reductants. In electroplating wastewater, there are often some heavy metal ions that are difficult to remove by precipitation, such as chromium ions, which can be converted into low-valent ions by oxidation-reduction method, so as to facilitate subsequent removal.
Ion exchange method:
The ion exchange method uses the selective adsorption characteristics of ion exchange resins to adsorb heavy metal ions in wastewater on resins, thereby achieving wastewater purification. This method has good treatment effect and stable effluent quality, but the cost of resin regeneration and replacement is high.
Electrolysis:
The electrolysis method is to remove heavy metal ions in wastewater from wastewater by oxidation-reduction reaction on electrodes through electrolytic cells under the action of direct current. This method is suitable for treating heavy metal wastewater with high concentration, but it consumes a lot of energy and is complicated to operate.
Membrane separation technology:
Membrane separation technology uses the selective permeability of membranes to separate harmful substances from water molecules in wastewater. Common membrane separation technologies include reverse osmosis, electrodialysis, nanofiltration, etc. This method has good treatment effect, but the equipment investment and operating costs are high.
Biological method:
Although biological method is used in some industrial wastewater treatment, it is relatively limited in electroplating wastewater treatment. Because heavy metal ions and organic matter in electroplating wastewater are highly toxic to microorganisms, the treatment effect of biological method may be limited. However, in recent years, with the continuous advancement of microbial technology, the application of biological method in electroplating wastewater treatment has gradually increased.
In summary, Industrial electroplating wastewater treatment equipment usually adopts a combination of multiple treatment methods to ensure that the wastewater is effectively treated and meets environmental protection requirements.
