Activated Carbon Filter
The activated carbon filter is a core adsorption and deep purification unit. Its primary task is to address residual soluble organic matter, hard-to-degrade COD, characteristic color, and toxic substances remaining after biochemical treatment. It serves as a critical safeguard for ensuring stable compliance with effluent standards and achieving high-quality water reuse.
Working Principle
The working principle utilizes the immense specific surface area of activated carbon (typically 500–1500 m²/g) and its highly developed microporous structure to retain dissolved pollutants inside the pores through physical adsorption (van der Waals forces) and partial chemical adsorption.
Design & Operational Features
Carbon Type Selection
Select coal-based, wood-based, or modified carbon based on target pollutants (molecular weight, polarity). Large-molecule dyes require mesoporous carbon; small-molecule organics require microporous carbon.
Complex Influent Composition
Typically effluent from biological treatment — low concentration but complex composition, poor biodegradability (low B/C ratio). Activated carbon serves as the "ultimate purifier."
Adsorption Saturation & Regeneration
Performance declines sharply after saturation. Design online monitoring (color, COD breakthrough curves) and "standby tank" switching systems. Thermal regeneration requires transport to specialized facilities, incurring higher costs.
Microbial Growth Prevention
Warm organic-rich environments promote anaerobic bacteria growth, causing odors and filter bed clogging. Design must incorporate regular hot water/steam disinfection and effective backwashing systems.
Activated Carbon Filter Application Scenarios
Final Stage for Compliance Assurance
Positioned after biological treatment + coagulation sedimentation, serves as final checkpoint before discharge, ensuring stable compliance with color and COD standards.
Core Pre-treatment for Membrane Reuse
Positioned before reverse osmosis (RO) systems, forming "three-stage pre-treatment" with sand filters and precision filters. Adsorbs organics and removes residual chlorine — the "safeguard" for long-term membrane stability.
Support for Advanced Oxidation Processes
Combined with ozone to form "ozone-biological activated carbon" system. Ozone oxidizes large refractory molecules into smaller, adsorbable substances, which are then adsorbed by carbon or degraded by microbes — significantly extending carbon service life.
Advanced Treatment for Specific Process Wastewater
Used to treat small-volume, high-concentration streams such as dye mother liquor and paste preparation wastewater, functioning as an independent adsorption and recovery unit.
Core Advantages
01
Irreplaceable Treatment Effectiveness
Unmatched ability to remove dissolved color and characteristic refractory organic compounds — other physical filtration methods cannot achieve this, resulting in excellent visual clarity.
02
Reliable Safeguard Against Stringent Standards
The ultimate technical defense for meeting increasingly strict environmental discharge standards, particularly for color, COD, and AOX indicators.
03
Flexible Operation & Strong Adaptability
Functions as an "emergency safeguard" unit, effectively buffering against sudden influent quality fluctuations to ensure final effluent compliance.
04
High Compatibility with Various Processes
Flexibly combines with biological, oxidation, and membrane filtration processes to form an efficient, multi-level safety treatment barrier.
The activated carbon filter is the core technology for advanced purification and safety assurance, addressing the "final barrier for color and COD removal." Although it involves later costs for replacement or regeneration, its deterministic and reliable treatment performance makes it an indispensable component under high-standard discharge requirements. It serves as a crucial technical pillar for achieving environmental compliance and sustainable water reuse. Its operational status directly indicates the quality ceiling of the final treated water.