Multiple tray aerators

Multiple tray aerators with and without coke (often used for iron and manganese removal)—water cascaded over manufactured tray constructed from slats and coke. 

An atmospheric multiple-tray aerator consists of distribution trays, coke tray, and fine gravel tray. The removal of carbon dioxide by multiple-tray aerator (gravity ventilation system) can be estimated by an empirical equation, developed by Scott (19) ... 

A full-scale multiple-tray aeration unit with a 6 MGD capacity achieved 50% reductions from initial TCE influent concentrations of 150 pg/L... 

TCE), vinyl chloride, aldicarb (pesticide), and VOCs are listed in Table 9. The removal performances of a diffused aeration system for several organics (VOCs and carbofuran) are listed in Table 10. PTAs and multiple-tray aerators are effective in removing hydrogen sulfides and carbon dioxide in the range of 90-95%. Comparison of removal efficiencies for PCA (PTA) and diffused aeration is shown in Table 3. As this shown in this table, PCA is more efficient than diffused aeration, but diffused aeration can achieve a comparable removal of trans-1, 2 dichloroethylene and TCE. 

Table 11 compares various aeration systems such as PTA, diffused aeration, multiple-tray aeration, mechanical aeration, catenary grid, and Higee aeration for operations, maintenance, and energy consumption (4,6,15-18,20). All aeration systems do not require high operational skills, but the major difference in these systems is in energy consumption. Multiple-tray and mechanical aeration require the lowest level of operational skill, maintenance, and energy consumption therefore, for small systems these two aeration systems will have the lowest operational cost. 

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