Activated Carbon For Industrial Wastewater Treatment In Electroplating Plants Heycarbons Manufacturer From China
Electroplating plants use activated carbon to remove organic pollutants, heavy metal ions, and remove odors and discoloration in industrial wastewater.
Why Does Electroplating Plant Wastewater Need to Be Treated?
Electroplating plants are industrial enterprises that carry out electroplating processing. Their main work is to plate a layer of metal or alloy on the surface of various objects (usually metals) through electrochemical methods to improve the appearance, corrosion resistance, wear resistance, conductivity or other physical and chemical properties of the objects.
Common electroplating plants include zinc plating, nickel plating, chrome plating, copper plating, and multi-layer composite plating plants.
The electroplating process involves a large number of chemicals and heavy metals, which have a great impact on the environment. If untreated electroplating wastewater is directly discharged into water bodies or soil, it will cause water pollution, soil heavy metal accumulation, groundwater pollution and other problems.
Therefore, wastewater treatment is a very critical part of the environmental protection management of electroplating plants.
Why Activated Carbon is Better Adsorbent?
Activated carbon has well-developed pores, a high specific surface area, and strong adsorption capacity. It can remove a variety of organic pollutants and trace heavy metal ions that are difficult to remove through ordinary chemical treatment. The following is a detailed introduction to the advantages of using activated carbon to treat industrial wastewater from electroplating plants:
1. Adsorption of organic pollutants
Electroplating wastewater often contains: brighteners, wetting agents, surfactants, complexing agents, dyes and oils.
These organic substances are often difficult to remove by traditional precipitation or neutralization methods, and activated carbon can effectively adsorb these residues due to its high specific surface area and strong adsorption capacity, thereby improving the chemical oxygen demand (COD) removal rate of the effluent.
2. Removal of complexed heavy metal ions
In electroplating wastewater, some metal ions (such as copper and nickel) often exist in a complex state, combined with organic complexing agents, and are not easily removed by precipitation.
Activated carbon can adsorb or destroy some complexes through: physical adsorption and surface chemical action (such as ion exchange), thereby promoting further removal of heavy metals.
3. Reduce color and odor
Electroplating wastewater often has color (such as blue-green containing copper and orange-yellow containing chromium).
Activated carbon can adsorb coloring substances such as pigments and organic dyes to make the effluent clearer. At the same time, it adsorbs odor molecules to improve the smell of wastewater.
4. Stabilize the effluent water quality
In some electroplating workshops where the water quality fluctuates greatly, activated carbon can be used as the last “insurance” purification process to make the drainage indicators more stable and facilitate long-term discharge or reuse.
Activated Carbon Adsorption For Wastewater Treatment Process
In order to effectively treat electroplating wastewater, the “classification treatment + comprehensive treatment” method is usually adopted. The specific process is as follows:
1. Classification pretreatment
According to the different sources of wastewater, electroplating wastewater is usually divided into four categories: cyanide-containing wastewater, chromium-containing wastewater, acid-base wastewater and comprehensive wastewater, and preliminary treatment is carried out respectively.
2. Treatment of cyanide-containing wastewater
The oxidation method is adopted, usually using sodium hypochlorite or liquid chlorine as an oxidant to oxidize the highly toxic cyanide into non-toxic nitrogen or stable cyanate. The main reaction is as follows:
CN⁻ + Cl₂ + H₂O → CNO⁻ + 2H⁺ + Cl⁻
After treatment, further neutralization and precipitation are carried out to ensure that the cyanide is completely decomposed.
3. Treatment of chromium-containing wastewater
The reduction precipitation method is mainly adopted. Hexavalent chromium is reduced to trivalent chromium (the toxicity is greatly reduced), and then precipitated into Cr(OH)₃ by adding alkali. Commonly used reducing agents include sodium bisulfite, ferrous sulfate, etc.
4. Acid-base neutralization
For acidic or alkaline wastewater, the pH is adjusted by adding lime, NaOH or H₂SO₄ to provide suitable conditions for subsequent treatment processes (usually adjusted to pH 6.5~9.0).
5. Heavy metal precipitation
Add precipitants (such as lime, sodium sulfide, sodium carbonate, etc.) under neutralization conditions to make metal ions form insoluble hydroxide or sulfide precipitation, and then remove them through sedimentation tanks or pressure filters.
6. Coagulation, sedimentation and filtration
Add coagulants (such as polyaluminium chloride PAC) and coagulants (such as polyacrylamide PAM) to further remove suspended matter and colloids and improve the clarity of the effluent.
7. Activated carbon adsorption
Use activated carbon adsorption to remove residual organic matter, odour and colour, COD, and trace heavy metals.
8. Sludge dehydration and disposal
All sludge produced by precipitation must be dehydrated by filter pressing and uniformly treated as hazardous waste by qualified units. Random stacking or dumping is strictly prohibited.
Activated Carbon For Electroplating Wastewater Application Scenarios
Activated carbon is very suitable for the following electroplating wastewater scenarios:
- As a deep treatment process, it is placed after chemical precipitation or filtration;
- The wastewater contains a large amount of organic additives (brighteners, surfactants, etc.);
- The effluent must meet high standards for discharge or reuse (pre-RO system);
- Small batch high-volume wastewater treatment, such as precision electroplating or frequent switching of electroplating workshops.
Activated Carbon for Industrial Wastewater Treatment Customer Case
Coal powdered activated carbon for electroplating plant wastewater customer case
A Taiwanese customer uses coal-based powdered activated carbon for wastewater treatment. The specific specifications of the activated carbon are as follows:
- Coal powdered activated carbon
- 200 mesh
- Iodine value 950mg/g
- Moisture: max. 10%
Coal granular activated carbon for electroplating plant wastewater customer case
A Russian customer wants to use coal-based granular activated carbon for electroplating plant wastewater treatment. The product specifications are as follows:
- Coal granular activated carbon
- 12-40 mesh
- Iodine value: 950-1000mg/g
Coal Activated Carbon
Coconut granular activated carbon for electroplating plant wastewater customer case
A French customer requested to use coconut shell activated carbon to remove heavy metals from electroplating wastewater.
Based on the communication between the customer and heycarbons professional sales staff, the product specifications were finally determined as follows:
- Coconut shell granular activated carbon
- 8-30 mesh
- Iodine value 1050mg/g
In addition to coal powdered activated carbon and coal granular activated carbon, Heycarbons can also provide honeycomb activated carbon for your electroplating wastewater treatment business. Please tell us your needs and we will provide you with quality products, professional advice and free samples.
How to Choose Activated Carbon Type for Different Electroplating Plants?
The specific form (powder or granule) used is related to the treatment system design, wastewater type, enterprise scale, treatment capacity, etc., rather than which one is fixedly used by certain specific electroplating plants. The following scenarios are for your reference:
Electroplating plants using coal-based powdered activated carbon (typical situation)
1. Small and medium-sized electroplating plants
- The system is simple, there is no fixed adsorption tower, and intermittent dosing treatment is used.
- For example, some companies engaged in electroplating of small hardware parts.
2. Plants that mainly treat complex organic matter
- Such as nickel-plating and copper-plating wastewater with high COD (chemical oxygen demand).
3. Plants with emergency treatment needs
- Add powdered activated carbon to quickly reduce pollutant indicators.
Electroplating plants using coal-based granular activated carbon (typical situation)
1. Large electroplating parks or automation enterprises
- Have fixed activated carbon adsorption towers or filtration systems.
- For example, auto parts electroplating bases and environmental protection park centralized treatment stations.
2. Plants that require continuous and stable operation
- Such as 3C electronics factories and electroplating plastic parts factories, which have strict requirements on water quality.
3. Plants with carbon regeneration systems
- Granular carbon can be recycled and reused, reducing operating costs.
Heycarbons Activated Carbon For Industrial Wastewater Treatment
Custom Heycarbons Activated Carbon Solution For Industrial Wastewater
Heycarbons provides a full range of activated solutions at competitive prices.
Custom Heycarbons Activated Carbon For Industrial Wastewater
Heycarbons has proudly served the activated carbon industry with high-quality products since 2005, we can customize your activated carbon for your project.
- Personalized service and advice based on your needs and preferences. Different raw materials for different applications.
- Customized size, iodine value , methylene blue, PH, ash, etc. Also acid washing.
- Heycarbons customized package to promote your brand, and free design service.
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Steps to Custom Heycarbons Activated Carbon For Industrial Wastewater
Consultation
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Quotation
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