Description
Coarse bubble diffusers (EPDM coarse bubble diffusers) produce bubbles with a diameter of 4-5mm, which rise rapidly from the bottom of wastewater or sewage treatment tanks. Coarse Bubble Diffuse are commonly used in grit chambers, equalization basins, chlorine contact tanks, aerobic digesters, and sometimes in aeration tanks. Compared to fine bubble diffusers, coarse bubble diffusers are better at vertically “pumping” water, although they typically have about half the oxygen mass transfer efficiency of fine bubble diffusers when the same air volume is used.
The advantages of coarse bubble diffusers are primarily in their anti-clogging properties, enhanced air mixing, and lower maintenance requirements. They are especially suited for industrial applications that require higher durability and anti-clogging features.
System Advantages of Coarse Bubble Diffusers
- Anti-clogging Design: Coarse bubble diffusers feature a check valve that prevents backflow. When operation stops, the membrane structure closes automatically under the rebound force and water depth pressure, preventing the backflow of sludge water.
- Reinforced Membrane: The membrane material is reinforced to ensure that it does not detach during operation.
- Optimized Airflow Path Design: The airflow channels are designed to reduce resistance loss along the path, enhancing airflow efficiency.
- Reinforced Air Injection Mechanism: The diffuser’s screw roots are strengthened to prevent thread breakage.
The intelligent design allows the system to close and seal automatically when the air supply is turned off, preventing clogging caused by debris like fabric strips in the tank. The thickened pipe walls and double bracket design enhance system stability, reducing the risk of breakage. The use of rubber joints for connection makes transportation, handling, and on-site installation easier and more cost-effective.
Specifications of Coarse Bubble Diffusers
Key Applications
Coarse bubble diffusers are widely used in secondary wastewater treatment applications, especially in environments where sediments and carbonates accumulate rapidly. These materials can easily clog fine bubble diffusers, but the larger openings of coarse bubble diffusers effectively prevent such blockages.
- Aerobic Digesters: Coarse bubble diffusers are commonly used in these traditional applications. The standard design rate is 30 SCFM per 1000 cubic feet of tank volume. With the use of flexible membrane diffusers, the air flow rate can be reduced by up to 50% while maintaining good mixing and dissolved oxygen levels.
- Mechanical Sludge Thickening: Coarse bubble diffusers provide sufficient aeration energy for mixing and oxidation in high-solid concentration applications.
- Automated Thermophilic Aerobic Digestion (ATAD): Coarse bubble diffusers perform well in high-solid and high-temperature applications, with their backflow prevention feature effectively managing the challenges posed by high-temperature environments.
- Small or Packaged Treatment Systems: In these systems, energy concerns are less critical, making coarse bubble diffusers an ideal choice. They offer higher operational efficiency.
- Air Stripping: Coarse bubble diffusers are particularly suitable for air stripping applications involving groundwater or wastewater with volatile compounds due to their high air volume capacity.
Conclusion
Coarse bubble diffusers are an efficient, durable, and low-maintenance wastewater treatment solution, particularly in applications that require larger openings and enhanced mixing capabilities. Through advanced design, they effectively avoid clogging while maintaining high oxygen transfer efficiency and good mixing performance. Coarse bubble diffusers provide a reliable solution for industrial applications requiring anti-clogging, durability, and efficient treatment.
