How to Efficiently Purify River Water Using a Dissolved Air Flotation (DAF) System?
1. Current Challenges in River Water Pollution and the Need for Effective Treatment
With rapid urbanization, river pollution has become a pressing environmental concern. Common issues include black-odor water, excessive suspended solids (SS), and algal blooms caused by nutrient overload. Traditional sedimentation methods are inefficient, land-intensive, and unsuitable for modern river restoration needs. In contrast, dissolved air flotation (DAF) systems offer a compact and efficient solution for the rapid removal of contaminants, making them an essential technology in river water treatment.
2. Core Role of DAF Systems in River Restoration
A DAF system (Dissolved Air Flotation) removes pollutants by generating microbubbles that attach to contaminants, separating them from the water. It is especially effective in:
- Removing Suspended Solids (SS): Such as silt, organic particles, and algae.
- Separating Oil and Grease: Ideal for rivers impacted by surface runoff or industrial discharge.
- Controlling Eutrophication: Reducing algae growth and improving water clarity.
3. How Does a DAF System Work in River Water Treatment?
- Microbubble Generation: Air is dissolved in water under pressure. When released, it forms microbubbles that carry an electric charge, attracting suspended pollutants.
- Coagulation and Flocculation: Coagulants like PAC and PAM are added to form flocs from fine particles, enhancing flotation efficiency.
- Flotation and Separation: The microbubbles attach to the flocs and rise to the surface, forming a scum layer. This is removed by a mechanical skimmer, while clarified water is discharged from the bottom.
4. Standardized River Water Treatment Process Using a DAF System
- Pre-treatment: Bar screens remove large debris to protect equipment.
- Chemical Dosing: Coagulant dosage is adjusted based on raw water quality.
- DAF Unit Operation: Treated water and microbubbles form floating sludge.
- Sludge Removal: Skimmer collects sludge; treated water is discharged or reused.
5. 4 Key Advantages of DAF Over Traditional Treatment Methods
- High Efficiency: Short treatment time (15–30 minutes) with 40% lower energy consumption than sedimentation tanks.
- Compact Design: Space-saving layout suitable for riverbanks or urban sites.
- Wide Applicability: Handles high-COD wastewater (up to 5000 mg/L).
- Low Maintenance: High automation reduces labor requirements.
6. Introducing Jorsun Roll Flow® DAF – A High-Speed Solution for Municipal and River Water
Roll Flow® DAF by Zhongshen Environmental is a next-gen DAF system built on proprietary technology. Designed for high-load, large-scale water treatment, it offers exceptional performance for municipal and river applications.
Key Features & Benefits:
- High Surface Loading: 15–52 m³/m²/h
- Large Capacity: Treats 5,000 to 50,000 m³/day per unit
- Energy Efficient: >50% lower consumption than horizontal DAFs
- Space Saving: Reduces land use by 40–70%
- Superior Effluent Quality: SS < 5 mg/L, Phosphorus < 0.1 mg/L
- Flexible Installation: Available in both skid-mounted and civil construction formats
Conclusion
DAF systems have become a cornerstone in modern river water purification thanks to their speed, efficiency, and low operational cost. When combined with ecological restoration methods, DAF technology can significantly improve water quality and revitalize aquatic ecosystems.
Interested in tailored solutions or DAF specifications for river treatment? Contact a professional environmental equipment provider to customize your treatment strategy.