Leachate Treatment: SINOKLE’s CDOF Technology for Efficient, Green, and Cost-Effective Solutions
Leachate from landfills and incineration processes is a high-concentration, highly toxic organic wastewater with complex composition and poor biodegradability, representing a major environmental challenge worldwide. Traditional treatment methods often suffer from low efficiency, high cost, and risks of secondary pollution.
Shenzhen Clear Science & Technology Co., Ltd (SINOKLE) has independently developed the CDOF (Cyclonic Dissolved Ozone Flotation) technology, which integrates DAF (Dissolved Air Flotation), micro-bubble generation, and ozone oxidation. Its core advantages — full-volume treatment, membrane-free process, and zero concentrate — offer an industry-leading solution for efficient, economical, and green leachate treatment.
I. Leachate: Characteristics and Industry Challenges
Leachate is a complex wastewater formed during municipal waste stacking, landfilling, or incineration, influenced by fermentation, rainwater leaching, and groundwater percolation. Its key characteristics pose serious treatment pressures:
· Extremely high pollutant concentrations: COD often reaches tens of thousands of mg/L, ammonia nitrogen (NH3-N) commonly exceeds 1,000 mg/L, hundreds of times higher than typical municipal wastewater.
· Complex composition and high toxicity: Contains large amounts of refractory organics (e.g., aromatics, halogenated compounds), heavy metals (e.g., Cr, Pb), and over 70 detectable carcinogenic or mutagenic substances.
· Poor biodegradability: As landfills age, leachate BOD5/COD often drops below 0.1, with refractory organics exceeding 60%, making traditional biological treatment largely ineffective.
Untreated leachate can severely pollute soil and groundwater, cause eutrophication, and result in bioaccumulation of heavy metals, ultimately threatening ecosystems and human health.
II. Limitations and Pain Points of Traditional Treatment Methods
Current mainstream treatment technologies have inherent limitations:
· Membrane technologies (NF/RO): Adequate effluent quality, but membranes foul easily, flux declines rapidly, frequent cleaning and replacement increase operational costs. Produces 15–30% concentrate by influent volume (hazardous waste), costly to dispose of, leading to unit water treatment costs exceeding 20USD/m³.
· Fenton oxidation: Requires large chemical doses, high cost, and generates 10–15% iron sludge hazardous waste, difficult to handle. Requires strict pH control (~3), and effluent may be “recolored,” resulting in unstable operation.
· Biological treatment (e.g., MBR): High influent biodegradability required; ineffective for aging leachate with refractory organics. Effluent COD often above 1,000 mg/L, failing to meet strict discharge standards.
III. SINOKLE’s CDOF Process: Performance Revolution through Technology Integration
The CDOF technology integrates patented ozone advanced oxidation, cyclonic separation, and dissolved air flotation, delivering revolutionary improvements in efficiency and effectiveness.
1. Core Technical Principles and Advantages
· High-efficiency ozone catalytic oxidation: Uses a dedicated heterogeneous catalyst in a pressurized, sealed reactor to efficiently convert ozone into hydroxyl radicals (·OH) with an oxidation potential of 2.8 V, non-selectively attacking and breaking down refractory organics, mineralizing macromolecular pollutants to CO2 and H2O.
· Cyclonic dissolved-gas flotation integration: Unique cyclonic flow design and micro-nano bubble generation allow thorough contact and adsorption with pollutants, quickly floating and separating them while synchronizing oxidation and separation, greatly shortening hydraulic retention time.
· Intelligent full-automatic control (DCS/PLC): Monitors exhaust ozone, effluent ORP, and pH in real-time, dynamically optimizing ozone dosage and reaction parameters to maintain stable compliance under influent fluctuations while minimizing energy and chemical consumption.
2. Outstanding Performance and Economic Benefits
Compared to traditional processes, CDOF offers comprehensive advantages:
· Rapid reaction: Effective hydraulic retention time <15 minutes, ~1/6 of conventional ozone oxidation (~90 min).
· High ozone utilization: System ozone utilization >99.98%; ozone-to-COD ratio optimized to 0.5–1.2, 1/5–1/2 of traditional methods, reducing operating costs to 1/3–1/2.
· Minimal sludge generation: Sludge reduced by over 90%, greatly easing hazardous waste disposal.
· Excellent effluent quality: Removes odor and color efficiently (>90% color reduction), effluent is colorless, odorless, and stable.
· Significant cost advantages: The patented “CDFU + CDOF + biological” combination yields unit water treatment costs far lower than traditional “membrane + evaporation” processes.
IV. Demonstrated Engineering Applications
SINOKLE’s CDOF technology has been successfully applied in multiple leachate treatment projects, with clear water quality improvements validating its superior performance.
Conclusion
Facing the challenges of leachate treatment, SINOKLE’s CDOF process offers a fully integrated, high-oxidation-efficiency, cost-effective, and green solution with zero secondary pollution. It ensures stable, compliant discharge, supports “zero-waste city” initiatives, and safeguards groundwater sustainability. SINOKLE will continue advancing in advanced oxidation technologies to protect every drop of water and the blue skies above.
