This process mixes the waste liquor with air and preheats it by steam during startup and by the reactor effluent during operation to about 300° to 400°F (see Figure 7.50.5). At this reactor inlet temperature, oxidation starts with the heat release which further increases the temperature as the liquor-air mixture moves through the reactor. The higher the operating temperature, the greater the COD reduction for the same contact time period (see Figure 7.50.6). The operating temperature cannot exceed the critical temperature of water (705°F) because the continuous presence of a liquid water phase is essential.
The operating temperature in the reactor is the temperature of the saturated steam at the partial pressure of steam in the air-steam mixture. The air-steam mixture is
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