Powdered Activated Carbon Application in Wastewater Treatment
Author : Andy Activated Carbon Manufactur | Published On : 15 May 2026
1. Introduction
Sewage produced by industrial production and urban daily life contains a large amount of refractory organics, colloids, pigment substances, odorous gases, heavy metal ions and emerging micro-pollutants such as antibiotics and microplastics.
Traditional water treatment technologies including activated sludge and coagulation sedimentation have limited effect on high-concentration COD, persistent chroma and toxic pollutants, making it hard to meet stable discharge standards.
Powdered Activated Carbon is made from coconut shell, wood chips and coal raw materials through high-temperature activation and ultrafine grinding. It has a specific surface area of 500–1500 m²/g, with rich micro-pore and meso-pore structure. It is widely used in sewage treatment industries such as chemical industry, printing and dyeing, pharmaceutical, electroplating and municipal water plants.
2. Performance and Adsorption Mechanism
Basic Performance
- Large specific surface area provides sufficient adsorption sites
- Multi-level pore structure adapts to organic pollutants of different molecular weights
- Rich surface oxygen-containing functional groups enhance chemical adsorption and heavy metal chelating capacity
- Fine particle size, good dispersion, fast mixing and rapid adsorption reaction
Working Principle
1. Physical Adsorption
Relying on Van der Waals force, PAC quickly captures small molecular organics, suspended colloids, pigment particles, hydrogen sulfide and ammonia odor substances, effectively reducing COD, BOD and water chroma.
2. Chemical Adsorption
Surface functional groups react and chelate with phenols, pesticide residues, antibiotics and heavy metal ions such as lead, mercury and chromium, stably removing toxic and harmful pollutants that are difficult to degrade by conventional processes.
3. Biological Synergistic Effect (PACT Process)
Powdered activated carbon is added into the aeration tank as a carrier for microbial attachment to form high-density biofilm. It enriches refractory organics locally, improves dissolved oxygen utilization, accelerates microbial degradation, enhances impact load resistance and optimizes sludge sedimentation performance.
3. Main Application Processes
PACT Process (Powdered Activated Carbon-Activated Sludge)
Dosed at the front end of the aerobic aeration tank. Combined with activated sludge for mixing and reflux, it realizes adsorption, microbial degradation and integrated sedimentation. It is widely used in printing and dyeing, petrochemical, coking and pharmaceutical high-difficulty wastewater treatment.
Coagulation Combined with PAC Process
Add powdered activated carbon first for preliminary adsorption, then add flocculant for coagulation and precipitation. It features low investment, fast effect, high decolorization rate and obvious heavy metal removal effect.
Advanced End Water Treatment
Applied after secondary sedimentation tank, before MBR or sand filter tank. It removes residual trace COD, chroma and peculiar smell, ensuring effluent reaches Class A standard and water reuse requirements.
Emergency Water Treatment
Used for black and odorous river regulation, algae outbreak and chemical leakage accidents. Rapid dosing can quickly control pollution diffusion and improve water quality and visual effect.
4. Typical Application Scenarios
- Printing and Dyeing Wastewater: Efficient decolorization, removal of dye intermediates and refractory COD.
- Chemical & Pharmaceutical Wastewater: Elimination of organic solvents, aromatic compounds and antibiotic pollutants.
- Electroplating Heavy Metal Wastewater: Adsorption and removal of chromium, lead, mercury and cadmium ions.
- Municipal Sewage Plant: Water quality upgrading and stable standard discharge.
- Black Odorous Water Body Restoration: Fast deodorization, turbidity reduction and ecological water quality improvement.
5. Advantages of Powdered Activated Carbon
1. Strong adsorption capacity, fast reaction speed, complete removal of COD, color and odor.
2. Flexible dosing amount, no need for complex equipment, simple operation and low maintenance cost.
3. Good compatibility with various water treatment processes, easy for old sewage plant upgrading.
4. Optimize sludge sedimentation and dehydration performance, reduce sludge disposal cost.
5. Safe and environmentally friendly, no secondary pollution after adsorption.
6. Selection and Dosing Guidance
- Iodine value: Recommended above 800 mg/g for better adsorption performance.
- Particle size: 200–325 mesh with good dispersion and fast adsorption.
- Dosing concentration: 5–30 mg/L for advanced treatment; 30–100 mg/L for industrial wastewater.
- Contact reaction time: Keep 30–60 minutes with sufficient stirring.
7. Conclusion
Powdered Activated Carbon has become an irreplaceable functional material in wastewater treatment due to its excellent adsorption performance, flexible application and economic cost. It plays an important role in industrial wastewater advanced treatment, municipal sewage standard upgrading and black odorous water ecological restoration. It helps enterprises achieve standard discharge, water reuse and energy saving, and supports the green and refined development of water environmental governance.
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