The sieve tray tower is a highly effective contacting device for applications requiring a low gas-to-liquid ratio. The design consists of a number of perforated trays in a vertical cylindrical tower. Liquid flows horizontally across the trays while gas flows up through the perforated tray at high velocity creating a frothing effect where the gas absorption takes place. The liquid then flows through down comer pipes to the lower trays. The number of trays can vary depending on the application and efficiency required. Sieve trays are best suited for absorption of highly soluble but volatile compounds such as alcohols and other soluble organics as well as some acid gases. This type of configuration minimizes water usage while achieving maximum contaminant removal.