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基于铁基质高效催化还原污水中硝酸盐氮的实验研究
引用本文:李德生,张超,邓时海,胡智丰,李金龙,刘元辉.基于铁基质高效催化还原污水中硝酸盐氮的实验研究[J].化工学报,2019,70(3):1065-1074.
作者姓名:李德生  张超  邓时海  胡智丰  李金龙  刘元辉
作者单位:1. 北京交通大学土木建筑工程学院,北京 1000442. 水中典型污染物控制与水质保障北京市重点实验室,北京 100044
基金项目:国家自然科学基金项目(51778040,51278034)
摘    要:污水厂排水中硝酸盐氮(NO3-N)浓度偏高,难利用常规生物脱氮工艺实现NO3-N的深度脱除。以铁基质高效催化脱氮载体为污水中NO3-N的脱除材料,探究不同铁基质催化活性、pH和NO3-N浓度等对污水中NO3-N去除的影响及机制。研究结果表明:添加催化剂D的铁基质高效催化脱氮载体可脱除92.23%的NO3-N,调节污水为酸性至中性条件时,其NO3-N去除率均可达到92.09%以上,且氨氮(NH4+-N)积累量先升高后降低;当污水为碱性条件时,NO3-N的去除率亦可达86.13%以上,且在碱性条件时无NH4+-N积累;原水中NO3-N的浓度变化(20~70 mg·L-1)对铁基质高效催化脱氮载体的脱氮性能影响较小,NO3-N去除率均达到96.11%以上。与催化剂A、B和C相比,添加催化剂D的铁基质高效催化脱氮载体脱氮速率最快,NO3-N降解反应过程符合一级反应动力学方程,反应速率常数k=0.0170 min–1

关 键 词:污水厂排水  硝酸盐氮  零价铁  铁基质高效催化脱氮载体  催化剂  双金属  催化还原  反应动力学  
收稿时间:2018-09-25
修稿时间:2018-10-29

Experimental study on effective nitrate removal from sewage by ZVI-based catalyzed reduction
Desheng LI,Chao ZHANG,Shihai DENG,Zhifeng HU,Jinlong LI,Yuanhui LIU.Experimental study on effective nitrate removal from sewage by ZVI-based catalyzed reduction[J].Journal of Chemical Industry and Engineering(China),2019,70(3):1065-1074.
Authors:Desheng LI  Chao ZHANG  Shihai DENG  Zhifeng HU  Jinlong LI  Yuanhui LIU
Affiliation:1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China2. Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, China
Abstract:It remains difficult to achieve effective nitrate removal with conventional biological nitrogen removal processes, for the high NO3--N concentration and low organic carbon in tail water from WWTP. Thus, ZVI-based catalyzed reduction was developed and applied in this study. The influence of catalytic activity of the catalysts, pH and NO3--N concentration on nitrate reduction by ZVI-based catalyzed reduction was studied, and the reaction mechanisms was investigated. The results show that the high-catalytic catalytic denitrification carrier with catalyst D can remove 92.23% of NO3--N, and the NO3--N removal rate can reach 92.09% when the wastewater is acidic to neutral. The NO3--N removal efficiency of above 86.13% was also achieved even under alkaline conditions, and no NH4+-N accumulation was found. Increasing in NO3--N concentration (20—70 mg·L–1) showed little impact on nitrate reduction efficiency (remaining ≥96.11%). The nitrogen removal efficiency by ZVI-based catalyzed reduction in the presence of catalyst D obtained the highest speed when compared to catalysts A, B and C, and the reduction reaction was in keeping with the first-order kinetics equation with a calculated reaction rate constant of k=0.0170 min–1.
Keywords:tail water from WWTP  nitrate  zero-valent iron (ZVI)  ZVI-based carrier  catalyst  bimetallic  catalytzed reduction  reaction kinetics  
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