直接空气吹脱法去除废水中的氨氮  

Preliminary study on ammonia nitrogen removal from wastewater by direct air stripping

作　　者：张成明 董保成[3,4] 张建华 刘晓玲[6] 白耀博[1] 杨英歌[1] 刘洁[1] 李十中 ZHANG Chengming;DONG Baocheng;ZHANG Jianhua;LIU Xiaoling;BAI Yaobo;YANG Yingge;LIU Jie;LI Shizhong(Xuzhou Biopharmaceutical and Waste Comprehensive Engineering Technology Research Center,Xuzhou Vocational College of Bioengineering,Xuzhou 221006,China;Institute of Nuclear and New Energy Technology,MOST-USDA Joint Research Center for Biofuels,Tsinghua University,Beijing 100084,China;Rural Energy and Environment Agency,Beijing 100125,China;School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Key Laboratory of Industrial Biotechnology,Ministry of Education(Jiangnan University),School of Biotechnology,Jiangnan University,Wuxi 214122,China;Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]徐州生物工程职业技术学院,徐州市生物制药与废弃物综合利用工程中心,江苏徐州221006 [2]清华大学核能与新能源技术研究院,中美生物燃料联合研究中心,北京100084 [3]农业农村部农业生态与资源保护总站,北京100125 [4]天津大学化工学院,天津300350 [5]江南大学生物工程学院,工业生物技术教育部重点实验室,江苏无锡214122 [6]中国环境科学研究院,北京100012

出　　处：《食品与发酵工业》2021年第19期155-160,共6页Food and Fermentation Industries

基　　金：徐州市应用基础研究计划(KC18016);国家重大专项(2015ZX07103-007)。

摘　　要：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CO^(2-)_(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 ob-jects 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 di-rect air stripping was also been evaluated.Decomposition of bicarbonate and subsequent hydrolysis of bicarbonate were the theoretical ba-sis of direct air stripping.The efficiency of ammonia removal could be improved by reducing the operating pressure,increasing the treat-ment 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 bicar-bonate in wastewater determines the deamination efficiency of this method.

关 键 词：氨氮 厌氧消化废水 空气吹脱 沼气发酵 分解反应 水解反应 

分 类 号：X703[环境科学与工程—环境工程]