Introduction
The document discusses the use of micro-bubble air diffusers in biological treatment processes, particularly in municipal and industrial wastewater treatment plants. The activated sludge process is highlighted as the most common method, requiring effective oxygenation of the bacterial mass in the sludge to degrade organic substances and transform inorganic compounds like nitrogen and phosphorus.

Specifications and Features
Micro-bubble air diffusers are available in disk or tubular forms, featuring micro-perforated membranes made from materials such as EPDM. These diffusers can be used for both continuous and intermittent aeration. They are installed on distribution grids at the bottom of treatment tanks, ensuring uniform air distribution and efficient oxygen transfer.

Operating Principle
The air supplied by blowers inflates the diffuser membranes, opening micro-passage holes and releasing air as fine micro-bubbles. This ensures even diffusion in the water and sludge, maximizing oxygen transfer efficiency.

Product Offerings
MITA Biorulli offers ENVICON circular and tubular air diffusers, known for high-quality construction and performance. These diffusers are available in various models, including patented disk diffusers (EMS) and tubular diffusers (EMR) of different lengths. Membranes are available in standard EPDM and special materials for specific applications.

Construction Materials
Standard membranes are made from EPDM, with special options like HT EPDM for deep tanks and silicon rubber for industrial wastewater. Support structures include FRPA for circular membranes and PVC for tubular membranes. Fixing adapters are available in stainless steel or interlocking FRPA rings.

Applications
The diffusers are suitable for continuous or intermittent aeration, active sludge biological treatment, and aerobic digestion of biological sludge.

Technical Data
The document provides technical specifications for various models, including dimensions, membrane materials, and installation accessories. It also includes performance graphs showing oxygen transfer efficiency and pressure drop relative to specific air flow rates.