2. Stripping of volatile pollutants

The field of stripping, whose effectiveness will only be optimal in a well-defined pH zone, which can be very far from neutrality, concerns sulphurous products (hydrogen sulphide H ₂ S, sulphurous gases, sulphides...), nitrogenous products (dissolved ammonia NH ₃ , ammonium ions ${\text{NH}}_4^{+}$ ) and certain volatile organic materials (solvents, phenols, alcohols...).

Industrial waste likely to be treated by stripping comes...