What is Process flow of Electroplating Wastewater Treatment System?
The electroplating industry is a traditional industry that is inextricably linked to our lives. It is one of the world's three most polluting industries.
The electroplating sector is rapidly expanding at the moment, and the damage produced by electroplating effluent to the environment is severe. Every year, the nation's electroplating sector generates approximately 4 billion m3 of wastewater, which exacerbates the country's water deficit and limits the electroplating industry's sustainable development.
Wastewater quality of electroplating sector
As long as electroplating wastewater comprises plating parts rinse water, waste bath liquid, cooling water, and so on, it is generally classified as cyanide wastewater, wastewater containing chromium (20-100mg/L), and heavy metals, acid, and alkali.The flow of wastewater varies depending on the scale and technique of production.
Electroplating wastewater has a high concentration of toxic and other hazardous compounds, such as hydrochloric acid, zinc, copper, heavy metals, organic brighteners, and so on, and is combined with other pre-treatments to generate comprehensive wastewater.
To eliminate contaminants from wastewater, chemical reaction additives and flocculants (PAV, PAM) are utilized. Heavy metals are removed from the effluent after a biological reaction and membrane treatment technique.
Advanced Electroplating Wastewater Treatment Technology
1: Alkaline cyanide method: Cyanide is oxidized in two steps using the alkaline cyanide method, i.e., adding oxidants in alkaline circumstances to convert cyanide ion into CO2 and N2 by two-stage oxidation, achieving the goal of removing cyanide ion.
2: Electrolysis method:It is primarily suitable for high-concentration cyanide-containing wastewater. The ferrite method is used to treat chromium-containing wastewater by using FeSO4 as a reducing agent to reduce Cr6+ to Cr3+, then adding alkali to co-precipitate Cr3+ and other heavy metal ions to produce litres of M(OH)n. Fe(OH)3, which is then passed through the air, heating, and other processes to eventually form ferrite.
Traditional Electroplating Wastewater Treatment Technology
1: Chemical Precipitation method:Chemical methods have become widely used in numerous processes in recent decades of electroplating industry development due to their mature processes and affordable investment.
The following diagram depicts the general course of the chemical precipitation method:
2: Membrane Treatment: The membrane separation method is a method of separating chemicals that makes use of the selectivity of a polymer. Membrane separation technology requires little capital input. At the same time, electroplating wastewater and contaminants may be effectively separated, resulting in significant economic and environmental benefits.
Advantages of using Membrane Technology in Wastewater Treatment
The advantages of membrane bioreactor treatment of electroplating wastewater include:
1: Low energy consumption,
2: No pollution,
3: A high concentration ratio,
4: Metal ions can be employed,
5: Reusing wastewater, reducing the amount of washing water used to achieve further treatment and discharge, and reducing the scale of biochemical, physical, and chemical treatment,
6: The membrane effluent water quality is good,
7: The system is simple to run, and it takes up little space,
8: The investment recovery period is rather short.
3: Zero Emission Treatment: The zero-emission treatment of salt-containing wastewater can be broken down into many typical process units, including pre-treatment, membrane concentration, and evaporativecrystallization.
The positive and negative ions in the solution flow to the positive and negative poles under direct current drive in electrodialysis technology. To construct a continuous arrangement of a concentrated chamber and a light chamber, the anion-cation exchange membrane is alternatively distributed between the positive and negative poles.
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