Coarse Bubble Diffusers
BioCell coarse bubble diffusers are a specially designed component for MBBR aeration systems. The coarse-bubble design is employed to mix the suspended media evenly throughout the reactor while providing the necessary mixing energy to slough off old biofilm from the internal surface area of the media and maintain the dissolved oxygen required to support the biological treatment process. They can meet the needs of oxygenation, stirring, and mixing at the same time, and are an ideal choice for oxygenation, stirring, and mixing occasions.
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Product Introduction
BioCell coarse bubble diffusers are a specially designed component for MBBR aeration systems. The coarse-bubble design is employed to mix the suspended media evenly throughout the reactor while providing the necessary mixing energy to slough off old biofilm from the internal surface area of the media and maintain the dissolved oxygen required to support the biological treatment process. They can meet the needs of oxygenation, stirring, and mixing at the same time, and are an ideal choice for oxygenation, stirring, and mixing occasions.
Our coarse bubble diffusers are made of stainless steel (SUS304 or SUS316L is optional). The coarse bubble air diffuser of the aerator provides maximum aeration and mixing efficiency. The standard length of the diffuser is 600 mm. A 600mm long aerator can achieve a 1250mm air release perimeter. It has a service life of more than 15 years.
Advantages of Coarse Bubble Diffusers
A multi-level air hole design could guarantee that the aeration strength is evenly distributed and the efficiency of dissolved oxygen.
The bottom hole design ensures the air hole keeps opening, and will not be blocked.
The pre-fabricated elements guarantee quick and easy installation. Installation is possible in all kinds of basins.
Coarse Bubble Diffuser Specification
| Diffuser Type | Design Airflow | Diffuser Length | ||
| scfm | m3N/h | in | mm | |
| BC-300 I | 0-30 | 0-48 | 12 | 300 |
| BC-300 II | 0-30 | 0-48 | 12 | 300 |
| BC-600 I | 0-55 | 0-87 | 24 | 600 |
| BC-600 II | 0-55 | 0-87 | 24 | 600 |
Coarse Bubble Diffuser Oxygen Transfer Efficiency
Optimum oxygen transfer efficiency is achieved when operating in the middle to low end of the airflow range.
The approximate operating pressure of the diffuser at the mid-range is 2 to 4 inches (0.5 - 1.0 kPa).
BC-600Ⅰ/Ⅱ Coarse Bubble Diffuser Operational Data
| α-Value | 0.7~0.9 |
| Air Load Per Diffuser Element | 0~87 m3/h |
| Backpressure Of The Diffuser | 5 ~ 20 mbar |
| Oxygenation Efficiency SOTE |
2~3 %/m (clean water) 3~5 %/m (30%~50% media fill rate) |
Performance Curve: DWP (Dynamic Waste Power) Curve
Air flow (scfm/per diffuser)
Performance Curve: OTE (Oxygen Transfer Efficiency) Curve
Air flow (scfm/per diffuser)
Installation Steps of Coarse Bubble Diffusers (BC-600Ⅰ)
For the coarse bubble diffuser installation of the MBBR aeration system, the following steps have to be followed:
1) Assembly of the bottom mounting brackets;
2) Mounting of the distributor pipes;
3) Leveling of the complete distributor unit and the MBBR diffusers.
Installation Steps
Mounting Brackets
The material of the brackets is SS304 or SS316L.
The first step is drilling a hole at the marked position of the chemical bolt, filling in the chemicals, hitting the top of the chemical bolt head with tools, and fixing it in the corresponding position. After the chemical bolt is fixed, install the bracket. It shows in Figure 1
Mounting Distributor
The next step is that the distributor pipes could be placed and fixed with the U-bolts. It shows in Figure 2
Leveling of The MBBR Coarse Bubble Diffuser (BC-600Ⅰ)
The aeration pipe and diffuser elements have to be adjusted with an Infrared level meter and the hexagon nuts, which are located on the bottom side of the mounting brackets, to avoid misalignments of the distributors. The fastening torque for the hex nuts is 110 Nm. (cf. Figure 3 and Figure 4).
Figure 3: Leveling The Aeration Pipe
Figure 4: Leveling The Diffuser
Success Case of Coarse Bubble Diffusers
