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Ventilation Systems

FINE BUBBLE MEMBRANE DIFFUSER

Repicky fine bubble membrane diffusers model RG-300, with thousands of micro holes, produce very high values ​​of O2 transfer, making them ideal for installation in the aerobic reactors of effluent treatment plants, both industrial and cloacal (see chart O2 transfer)
EPDM elastomeric membrane or ACRYLICS Nitrile (other compounds on request), allows to operate intermittently, with no liquid entering to the submerged pipes, making the start of air blowers easier and protecting pipes and diffusers from overpressure.

Advantages

The main advantages of the system with blowers and air diffusers REPICKY, compared with superficial aerators are:

• electricity savings of up to 50%
• Great use of space, as the reactors can be installed deeper (at greater depths more efficient transfer of oxygen).
• Greater flexibility with variable oxygen demand because of the possibility of increasing or decreasing the air rapidly that enters the ventilation chamber with the intervention of an operator on the equipment or automatically.
• Longer life than conventional mechanical aerators to help find the blower’s room from outside the area of corrosion.
• Elimination of spray contaminant around the plant.
• Elimination of dead spots and odors due to the very good mixing patterns which allows achieving some of the air which does not react.
• Possibility of modular growth in both the diffusers as blowers. Allows air needs in a reliable and adequate levels of investment at each stage of growth.

The air diffusers RG-300 can be installed in PVC or polypropylene grids and fixed with stainless steel brackets at the bottom of the reactors, or can be mounted on removable modules, single or multiple preassembled in the factory, reducing setup times and allowing their use in plants in operation with full reactors.

The use of these modules is also ideal for cameras with superficial aerators in operation where it is necessary to increase aeration, either permanently or for specific demands.
Whatever the geometry of the reactor, there is always an optimal configuration for the facility.

Main Technical Features

Standard materials: EPDM membrane or ACRYLICS Nitrile (other compounds on request), Base: ABS, External Aro: polypropylene.
Flow range: 2 to 8 Nm 3 / hour.
Design Flow: 5 Nm3 / hour.
Pressure Drop: 20 mbar for 2 Nm3 / h.
40 mbar for 5 Nm3 / h.
70 mbar for 8 Nm3 / h.
Density: 1 to 6 diffusers / m2.
O2 transfer std conditions: 15.4 g (5.5%) to 22.4 g (8%) per m3 / h of air per meter of depth.
O2 Transfer Efficiency: 2.5 - 6 kg O2/KWh.
Pipe: Diameter 2 "- 6" PVC, PP or stainless steel.

In large bioreactors, the required number of diffusers is determined by the total requirements of O2 as each diffuser provides a portion of the O2 required. The main variables involved in the transfer capability of each RG-300 diffuser are the useful depth of the reactor, the air flow rate per diffuser and the density or number of diffusers per m2 of reactor or chamber. In general, it has a better capacity to transfer O2 the deeper the chamber is, and the greater the number of diffusers per m2. In general, installations take between 1 and 2 m2 diffusers up to a practical 6 dif/m2 . For the initial calculations the design flow diffuser is used 5 m3 / h measured at 20 " C and normal atmospheric pressure (this condition is known as standard conditions). Then you may need an adjustment in the final amount of diffusers in terms of geometry and number of branches and grids adopted. The working range of the diffuser is 2 to 8 m3 / h, it is convenient to work at values close to the design flow as excellent results of aeration and mixing are obtained as well as long life of the membranes.

Oxygen transfer curve

Transfer of O2 per meter of depth depending on the air flow per diffuser (m3 / h) at 20"C, clean water and normal atmospheric pressure for various amounts of difusores/m2