Activated Carbon For Printing And Dyeing Plants Wastewater Treatment Heycarbons Manufacturer From China
Printing and dyeing wastewater is a typical industrial wastewater with high pollution, high chroma, high organic content and difficult biodegradation. It must be properly treated before discharge to avoid damage to water bodies and ecosystems.
Activated Carbon For Dye Removal Wastewater Treatment
Printing and dyeing wastewater mainly refers to the wastewater generated during the printing, dyeing and finishing process of textiles (such as cotton, wool, silk, chemical fiber, etc.). It is one of the industrial wastewaters with the largest discharge and the heaviest pollution load in the textile industry.
Printing and dyeing wastewater is a typical industrial wastewater with high pollution, high chroma, high organic content and difficult biodegradation. It must be properly treated before discharge to avoid damage to water bodies and ecosystems.
The main sources of printing and dyeing wastewater include:
- Desizing wastewater: produced when removing the sizing agent from the yarn, containing a large amount of organic matter (such as starch, PVA, etc.).
- Scouring wastewater: produced when textiles are scoured with alkali to remove impurities, containing soap, grease, etc.
- Bleaching wastewater: produced when bleaching fabrics, containing bleaching agents (such as hypochlorite or hydrogen peroxide) and by-products.
- Dyeing wastewater: wastewater generated by washing textiles after dyeing, containing residual dyes, auxiliaries, salts, etc.
- Printing and finishing wastewater: wastewater used for printing slurry, resin finishing, softening treatment and other links.
Activated Carbon Applications in Adsorption of Dye
Activated carbon has become one of the preferred materials for decolorizing dye wastewater due to its unique physical and chemical properties and excellent adsorption performance. The rich functional groups and developed pore structure on the surface of activated carbon enable it to effectively adsorb various dye molecules, thereby achieving the purpose of decolorization.
Decolorization
Dyeing wastewater often contains a large number of dye molecules, resulting in high chromaticity of the wastewater and serious visual pollution. Activated carbon can effectively adsorb dyes (including disperse dyes, reactive dyes, vat dyes, etc.), thereby significantly reducing the chromaticity of the wastewater.
Removal of organic matter
Dyeing wastewater contains a large amount of difficult-to-degrade organic matter (such as surfactants, dyeing aids, slurries, finishing agents, etc.). These substances are often not easily degraded by microorganisms during the biochemical treatment stage, resulting in high COD (chemical oxygen demand).
The porous structure of activated carbon can adsorb these organic pollutants and further reduce the COD in wastewater.
Deodorization
In addition to decolorization and organic matter adsorption, printing and dyeing wastewater may also contain some trace amounts of toxic or odorous substances (such as chlorine-containing additives, dispersants, etc.) that need to be treated.
Activated carbon can remove volatile organic compounds (VOCs) and other odor-causing molecules through physical or partial chemical adsorption. Improve the effluent quality and make it easier for wastewater to meet discharge standards or reuse.
Heycarbons Best Activated Carbon For Dye Decolorization
According to the characteristics of wastewater and treatment requirements, there are usually two forms of powdered activated carbon (PAC) or granular activated carbon (GAC). Both types of activated carbon have their own characteristics and are suitable for different treatment scenarios.
GAC Granular Activated Carbon
Due to its large particle size and high mechanical strength, granular activated carbon is more suitable for fixed-bed continuous treatment systems. It is not only easy to maintain, but can also be reused through thermal or chemical regeneration, which significantly reduces long-term operating costs.
Granular activated carbon is an economically viable option for printing and dyeing plants that require long-term stable operation and large water treatment volumes. Especially in the deep treatment stage, fixed-bed granular activated carbon can continuously ensure the stability of effluent water quality.
Granular Activated Carbon
PAC Powdered Activated Carbon
For the decolorization of wastewater from printing and dyeing plants, Heycarbons recommends the use of wood powder or coal powder. The following activated carbon specifications are available for your reference:
Wood powdered activated carbon specification for dye decolorization
- 200 mesh
- Ash content: max 5%
- Bulk weight: 0.35-0.45 g/cm³
- Methylene blue: 270 mg/g
Coal powdered activated carbon specification for dye decolorization
- 200 mesh
- Ash content: max 10%
- Bulk weight 400-500 kg/m³
Powdered Activated Carbon
If you have other specific needs, please tell Heycarbons. Heycarbons can customize activated carbon products for you.
How to Use Activated Carbon For Dye Decolorization in Printing And Dyeing Factory
Step 1: Pretreatment
Before the wastewater enters the activated carbon adsorption unit, it usually undergoes pretreatment:
- Regulating tank: balance water quality and quantity, stabilize pH;
- Coagulation sedimentation/flotation: remove most suspended solids (SS) and colloidal substances, and reduce the load on activated carbon;
- Biochemical treatment (such as activated sludge method or biofilm method): remove most biodegradable organic matter and reduce COD.
Purpose: Protect activated carbon and prevent suspended solids from clogging the activated carbon pores.
Step 2: Adsorption of dyes using activated carbon
Depending on the scale and operation mode, there are usually two methods:
Powdered activated carbon (PAC) dosing method
Powdered activated carbon is directly added to the wastewater (usually in a coagulation tank or a special adsorption tank), fully mixed with the wastewater to adsorb organic matter and dyes, and then separated through a sedimentation tank or flotation tank after forming flocs.
Advantages:
- Simple equipment and strong flexibility;
- Suitable for small-scale, intermittent or emergency treatment;
- Can be used in combination with coagulants (to form coagulation and adsorption effects);
Disadvantages: Frequent dosing is required, the amount of mud is large, and activated carbon is difficult to recycle and regenerate.
Granular activated carbon (GAC) adsorption tower
The pretreated wastewater enters the adsorption tower (or adsorption bed), and the wastewater flows through the loaded granular activated carbon layer by gravity or pump pressure. The dye, COD, etc. are adsorbed by the activated carbon, and the effluent quality is significantly improved.
Advantages:
- Continuous operation, suitable for large flow
- Easy to manage
- High adsorption efficiency, can decolorize and remove part of COD.
Disadvantages: The activated carbon needs to be replaced or regenerated regularly.
Step 3: Subsequent treatment
When the activated carbon is saturated with adsorption (usually manifested as an increase in effluent chromaticity or COD), it is necessary to:
Replace or regenerate the activated carbon
There are two methods for regenerating activated carbon: thermal regeneration and chemical regeneration.
- Thermal regeneration method (high temperature heating): Applicable to granular activated carbon, but the regeneration efficiency is low for dye pollutants.
- Chemical regeneration method (acid washing, alkali washing, oxidant treatment): For activated carbon in dye wastewater, the effect is often limited.
In fact, many printing and dyeing factories will directly replace the activated carbon instead of regenerating it.
Sludge treatment
The wastewater after PAC adsorption needs to be precipitated or flotated. The separated activated carbon sludge contains pollutants and needs to be dehydrated and safely disposed of.
Membrane Separation And Electrochemical Oxidation Technology For Treating Wastewater From Printing And Dyeing Plants
In addition to activated carbon adsorption, membrane separation technology and electrochemical oxidation technology can also be used to treat printing and dyeing wastewater.
Membrane separation technology
Membrane separation technologies used for deep treatment of printing and dyeing wastewater mainly include microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO).
MF and UF are often used as pretreatment for NF and RO. UF can separate macromolecular organic matter, colloids and suspended solids; NF can desalinate and concentrate at the same time; RO can remove soluble metal salts, organic matter, colloidal particles, etc., and can intercept all ions.
In wastewater with high color requirements, high-quality water reuse, or when the effluent needs to meet the discharge standards and the water volume is large, membrane separation technology is an ideal choice for deep treatment and water reuse of printing and dyeing wastewater.
Electrochemical oxidation technology
Under the action of an external electric field, electrochemical technology produces a large number of free radicals (such as hydroxyl radicals, etc.) in a specific reactor through specific chemical reactions, electrochemical processes or physical processes.
These free radicals have extremely strong oxidizing properties and can quickly and thoroughly degrade organic pollutants in wastewater. They are especially suitable for treating difficult-to-degrade, high-chromaticity pollutants such as printing and dyeing wastewater and chemical wastewater.
Electrochemical technology not only has environmental advantages such as simple operation, easy control, and low (or even no) pollutant emissions, but also has high flexibility and strong applicability. It can be optimized and adjusted according to different water quality conditions. Therefore, it has a wide range of application value and good development prospects in the field of wastewater treatment.
Activated Carbon For Printing And Dyeing Plants Customer Case
A Malaysian customer needed to treat the wastewater from the printing and dyeing factory to meet the local emission standards. He finally decided to use coal-based powdered activated carbon. The specifications are as follows:
- 200 mesh
- Iodine value: 650 mg/g
- Moisture: max 10%
- Ash: max 15%
- Apparent density: 560 g/L
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.
Call Us
+86-180 3788 5195
Our Email
info@heycarbons.com
Steps to Custom Heycarbons Activated Carbon For Printing Dyeing Factory
Consultation
By understanding your needs and requirements, our salesmen work with you to submit the appropriate activated carbon solution.
Quotation
Heycarbons expert customer service will provide you with a free quote based on your requirements as well as product specifications and quantities.
Production
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