Division BAT 20 In order to reduce odour emissions and total reduced sulphur emissions due to strong and weak odorous gases, BAT is to prevent diffuse emissions by capturing all process-based sulphur containing off-gases, including all vents with sulphur-containing emissions, by applying all of the techniques given below.

Collection systems for strong and weak odorous gases, comprising the following features:

• covers, suction hoods, ducts, and extraction system with sufficient capacity;

• continuous leak detection system;

• safety measures and equipment.

Incineration can be carried out using:

• recovery boiler

• lime kiln^f1

• dedicated TRS burner equipped with wet scrubbers for SO_x removal; or

• power boiler^f2

To ensure the constant availability of incineration for odorous strong gases, back-up systems are installed. Lime kilns can serve as back-up for recovery boilers; further back-up equipment are flares and package boiler