To remove method to remove technology theoretical basis for: waste water of NH3 - N normally with ammonium ion (NH4 +) and free ammonia (NH3) the status of the balance and the existence of (NH4 + + OH - = NH3 + H2O).When the PH is neutral, NH3 - N mainly exists in the form of ammonium ion (NH4 +).When the PH is alkaline, NH3 - N mainly free ammonia (NH3) exist.To remove method is adding alkali in wastewater, adjust PH value to alkaline wastewater into NH3 NH4 + in a first, then pass into the steam or air desorption, NH3 into gas phase from the wastewater, thereby to NH3 - N removal from the water.To remove the ammonia nitrogen in wastewater after generally remain within 120 mg/L.Prevent the blowing out of ammonia nitrogen cause secondary pollution, generally set after remove ammonia nitrogen absorption equipment (using acid absorption), after absorbing ammonia salts can be used as crop fertilizer.To remove a high concentration of ammonia nitrogen in the wastewater treatment technology, process conditions for the pH = 10 or 11, blowing time of 120 min, gas water ratio of 2000-2000:1.
Countercurrent operation, is often used to remove tower tower packing, equipped with a certain height to increase the gas - liquid mass transfer area thus conducive to ammonia desorption from the wastewater.Filler used polypropylene polyhedral hollow ball.Wastewater was promoted to the packed tower tower, and distributed to the entire surface of the packing, through packing flowing downwards, and gas reverse flow, the partial pressure of ammonia in the air increases with the increase of ammonia removal degree, reduce with the increase of gas liquid ratio.


The ammonia nitrogen to remove the main form of domestic USES at most is continuous blow to take off the tower.Continuous blow to take off the tower to remove method has higher removal efficiency and the smaller area.