english Pressure Adjustment in DAF Systems
Proper pressure regulation is essential for optimal microbubble formation and efficient pollutant separation
Proper pressure adjustment is critical for effective operation of Pressurised Dissolved Air Flotation systems, as it directly impacts air solubility in water and the quality of microbubbles that drive pollutant separation.
Pre-adjustment System Inspection
Before modifying pressure, check the entire system for leaks in pipelines, dissolved air tanks, and connections. Leaks cause unexpected pressure drops that make consistent pressure maintenance impossible. Also verify that key equipment—including air compressors, pressure regulating valves, and pressure gauges—functions normally.
Key Inspection Points
- Check all pipelines and connections for potential leaks
- Verify proper functioning of air compressors
- Test pressure regulating valves for responsiveness
- Ensure pressure gauges provide accurate readings
- Inspect dissolved air tanks for integrity
Core Control Devices Adjustment
The air compressor and pressure regulating valve are the primary tools. To increase pressure for higher air solubility, slowly adjust the valve to reduce airflow restriction or boost the compressor's output. To lower pressure (to prevent over-saturation), gently open the valve to release small amounts of pressure.
Adjustment Guidelines
- Use air compressor and pressure regulating valve as primary control devices
- Increase pressure gradually for higher air solubility
- Decrease pressure slowly to prevent over-saturation
- Make small, incremental adjustments for precise control
- Monitor system response after each adjustment
Real-time Monitoring and Fine-tuning
While adjusting, closely watch the pressure gauge on the dissolved air tank to track changes. Simultaneously, observe microbubble size in the flotation tank—ideal microbubbles are small and evenly distributed. Large bubbles may signal insufficient pressure, while too few or overly small bubbles could indicate excessive pressure.
Monitoring Indicators
- Monitor pressure gauge readings continuously
- Observe microbubble size and distribution in flotation tank
- Large bubbles indicate insufficient pressure
- Too few or overly small bubbles suggest excessive pressure
- Make minor adjustments based on visual observations
Post-adjustment Stability Maintenance
Once the desired pressure is reached, run the system for a period to monitor for fluctuations. Regularly check gauges and equipment to prevent pressure drops or spikes from issues like pipeline blockages or compressor wear. Address slight fluctuations immediately with small adjustments to keep pressure consistent.
Maintenance Practices
- Run system to verify stability after adjustments
- Regularly check pressure gauges and equipment
- Monitor for pipeline blockages or compressor wear
- Address fluctuations immediately with minor adjustments
- Maintain consistent pressure for reliable operation
Important: The adjustment process requires systematic steps focused on precision and stability, avoiding sudden changes that could disrupt overall performance. Rapid pressure shifts can cause pipeline water hammer or uneven air dissolution, resulting in poor microbubble formation.
