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Removal and recycling of components from air and gas waste streams. Removal and recycling of components from air and gas waste streams are becoming more important as purified gas streams must fulfil the requirements of national emission regulations (TA Luft in Germany). Processes for the removal of organic and inorganic components from gas streams are condensation, absorption, adsorption, and permeation. Physical principles, uses and limits of these processes, and appropriate apparatus are discussed.

Purification of solvents containing air – Alternative methods. Different processes are used for the purification of solvents containing air: condensation, absorption, adsorption, combustion, membrane permeation, and biofilters or bioscrubbers. The processes will be explained by examples. The specifications required by “TA Luft” often cannot be reached only by condensation and membrane permeation. The success of absorption depends on the scrubbing liquid. Glycol ethers are useful scrubbing liquids – especially for chlorinated hydrocarbons. The choice of the process depends on the volume flow rate, the solvent concentration, and the kind of solvent. Recycling of the solvents reduces the costs of the process.