Abstract
High-silica zeolites (US-Y and ZSM-5) were used to adsorb organics from retort waters derived from Stuart oil shale (Queensland, Australia). Removal of organics increased with decreasing polarity of the adsorbate and improved when free ammonia was removed first by air stripping. Zeolites were more effective than activated carbon. They are easily regenerated and are potential agents for pretreatment for retort waters before biological treatment.
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