| 摘要 |
A method is provided for removing ammonia from wastewater containing in excess of about 15 ppm NH3(N)-T. The method comprises treating the wastewater with an alkaline reagent selected from the group consisting of lime and caustic sufficient to raise the pH to provide a free ammonia equivalence (FAE) to a value of at least about 12.4, the free ammonia equivalence being determined as follows: FAE=pH+( theta /15)0.5 wherein pH is the pH value of the treated wastewater and theta is the temperature of the wastewater in degrees Fahrenheit. The treated wastewater is gas-stripped to lower the total ammonia content of the treated wastewater to a value of less than about 10 ppm NH3(N)-T, the gas stripping being controlled to maintain the free ammonia equivalence of the wastewater phase being stripped to a value of at least about 12.4, following which the stripped wastewater is acidified to lower the un-ionized ammonia content to less than about 0.05 ppm NH3(N).
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