为初步阐明直接空气吹脱法去除废水中氨氮的原理,并评估关键操作因素对该方法去除氨氮效率的影响。分别以天然沼液及人工配制废水为实验对象,通过检测直接空气吹脱处理前后体系的pH、碱度及氨氮浓度的变化,提出和验证假设,并评估以上因素对直接空气吹脱法去除氨氮的影响。结果表明,HCO-3的分解反应及随后CO2-3的水解反应是直接空气吹脱法去除氨氮的理论基础。降低操作压力、升高处理温度、增加通风量,均可提高脱氨效率。50 ℃,通风量16 vvm,处理1 h时,废水中氨氮从533.6 mg/L下降到193.9 mg/L,下降63.7%。该方法可以应用于含有HCO-3的氨氮废水的脱氨处理,且无需添加碱试剂。废水中HCO-3的浓度决定了该方法的脱氨效率。
To elucidate the principle of ammonia nitrogen removal from wastewater by direct air stripping and evaluate the influence of key operation factors on ammonia nitrogen removal efficiency, anaerobic effluents and artificial wastewater were taken as experimental objects in this study. The changes of pH, alkalinity and ammonia nitrogen concentration of the system were detected to put forward and verify the hypothesis before and after direct air stripping treatment. And the influence of above factors on the removal of ammonia nitrogen by direct air stripping was also been evaluated. Decomposition of bicarbonate and subsequent hydrolysis of bicarbonate were the theoretical basis of direct air stripping. The efficiency of ammonia removal could be improved by reducing the operating pressure, increasing the treatment temperature and the ventilation rate. Under the condition of 50 ℃, ventilation rate of 16 vvm (air volume/culture volume/min) and treatment time of 1 h, ammonia nitrogen in wastewater decreased from 533.6 to 193.9 mg/L, decreased by 63.7%. This method can be applied to the treatment of ammonia nitrogen wastewater containing bicarbonate without adding alkali reagent. The concentration of bicarbonate in wastewater determines the deamination efficiency of this method.
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