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The use of ammonia (NH 3 ) rich wastewaters as an ecological chemical absorption solvent for the selective extraction of carbon dioxide (CO 2 ) during biogas upgrading to ‘biomethane’ has been studied. Aqueous ammonia absorbents of up to 10,000 gNH 3 m −3 demonstrated CO 2 absorption rates higher than recorded in the literature for packed columns using 20,000–80,000 g NH...
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