Environmental Fact Sheets

Wet scrubbing absorption technology allows treatment of pollutants in gaseous emissions. It is particularly applicable to acid emissions, combustion emissions, volatile organic compounds and odours. Pulp and paper, metallurgical and chemical plants are principal sources of these pollutants, as well as industrial waste incinerators.

Treatment of gaseous emissions with wet scrubber absorption involves the neutralization of the pollutants by means of a purifying liquid. This liquid, whose nature varies according to the pollutants being treated, is put in contact with the gaseous emissions. The pollutants are captured by the liquid and removed from the gaseous effluent. At the system's outflow, process water can be discharged into municipal sewers or, if required, piped into a treatment system.

Nature of the contaminants being treated by the process

The gaseous effluent treatment system perfected by MESAR/ENVIRONAIR eliminates most of the pollutants contained in the gaseous emissions. It self-adjusts to variations in the concentration of pollutants in gaseous emissions undergoing treatment and the response time is less than 2.5 seconds.

A removal efficiency of 99% of the purification droplets (<5 microns) is achieved, thus minimizing the quantity of liquid which could require further treatment in certain cases, or which might escape into the atmosphere. In addition, 98% of the chemical reagents (purification liquid) used are recovered.

• gas diffuser ;
• packing or absorption zone;
• purification liquid diffuser;
• mist eliminator;
• purification liquid sump

Gaseous emissions are first introduced at the base of the treatment column, where a gas diffuser ensures that they are evenly distributed through the system. They are then put in contact with the purification liquid in the packing or absorption zone. A second diffuser ensures that the purification liquid is evenly spread. Gaseous emissions then pass through the mist eliminator situated at the top of the treatment column. Droplets of liquid carried by the purified gases are intercepted and returned to the absorption zone. The purification liquid is collect in a sump tank.

The unit maintains a constant control over the quantity of purification liquid being injected into the treatment tower, as a function of pollutant concentration in the gaseous emissions.

Dimensions of MESAR/ENVIRONAIR's treatment system vary according to the air flow being treated. Each system is tailored to the client's specific needs. Components are then manufactured in the plant, assembled and installed on-site. MESAR/ENVIRONAIR takes responsibility for personnel training and system start-up.