Common methods for treatment technology of electroplating reclaimed water equipment
The authors plating water reuse equipment processing techniques commonly used methods: electroplating industry, water reuse: that is, through in-depth technical treatment of industrial waste water, to remove all impurities, removal of toxic and hazardous substances and some heavy metals polluted water, disinfection Sterilized, the water is colorless, tasteless, clear and transparent, and meets recycling standards. The water reuse system in the electroplating industry uses industrial wastewater discharged up to the standard as raw water, which is pre-pretreated and then treated by RO reverse osmosis. After a series of pre-treatments, particles, colloids, organic impurities, heavy metal ions, bacteria, viruses, heat sources and 99% of dissolved salt can be removed from the reclaimed water. 1. Chemical precipitation method: Chemical precipitation method is a method to convert heavy metals in the dissolved state of heavy metal wastewater into heavy metal compounds that are insoluble in water, including neutralization precipitation and sulfide precipitation methods. 2. Redox treatment (chemical reduction method): Chemical reduction method treatment is one of the earlier applied treatment technologies, which has a wide range of applications in my country. Its treatment principle is simple, easy to handle, and can withstand the impact of large water and high-concentration wastewater. . Chemical reduction method is used to treat Cr-containing wastewater. Lime is generally used for alkalization, but there are many waste residues. With NaOH or Na2CO3, there is less sludge. 3. Solvent extraction separation: Solvent extraction is a commonly used method for separating and purifying substances. When using this method, it is necessary to choose an extractant with higher selectivity. The heavy metals in the wastewater generally exist in the form of cations or anions. Although the extraction method has great advantages, the loss of solvent in the extraction process and the large energy consumption during the regeneration process make this method have certain limitations and its application is greatly restricted. 4. Adsorption method: Adsorption method is an effective method to remove heavy metal ions by using the unique structure of the adsorbent. The adsorbents used to treat electroplating heavy metal wastewater by adsorption method include activated carbon, humic acid, sepiolite, polysaccharide resin and so on. Activated carbon is simple in equipment and widely used in wastewater treatment. However, the regeneration efficiency of activated carbon is low, and the treated water quality is difficult to meet the reuse requirements. It is generally used for the pretreatment of electroplating wastewater. The content of heavy metals in the treated wastewater is significantly lower than the comprehensive sewage discharge standard. Environmental water treatment equipment company reminds you: Wastewater treatment, reclaimed water reuse, and zero discharge of wastewater are widely used in various industries. Interested parties are welcome to follow our website and get in touch with us.
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