无烟煤去除水中亚硝酸盐氮的机理研究  

Mechanism study of nitrite nitrogen remove from water by anthracite

作　　者：郑茜[1] 周秋红[1] 何靖[1] 方芳[1] 郭劲松[2,3] 

机构地区：[1]重庆大学城市建设与环境工程学院,重庆400045 [2]中国科学院重庆绿色智能技术研究院,重庆401122 [3]中国科学院水库水环境重点实验室,重庆401122

出　　处：《环境工程学报》2017年第1期127-135,共9页Chinese Journal of Environmental Engineering

基　　金：国家科技支撑计划项目(2012BAJ25B06;2015BAL04B05)

摘　　要：近年来,随着工农业迅速发展,城市化进程加快,水体"三氮"污染逐渐成为研究热点,其中NO_2^--N的危害及毒性居首,去除饮用水中的NO_2^--N意义重大。通过对无烟煤、瓷砂和沸石3种滤料去除水中NO_2^--N的效果进行比选,结果表明,无烟煤对水中NO_2^--N的去除效果最好。无烟煤对NO_2^--N的等温吸附更符合拟二级动力学吸附过程,且能很好地用Freundlich吸附模型拟合。pH对去除效果有影响,pH在6~7的范围内去除效果最佳。在一定浓度范围内,提高NO_2^--N的初始浓度,有利于提高无烟煤对NO_2^--N的去除效果。5种无机阴离子(Cl^-、NO_3^-、SO_4^(2-)、CO_3^(2-)和PO_4^(3-))对无烟煤去除NO_2^--N有不同程度的抑制作用:PO_4^(3-)>CO_3^(2-)>SO_4^(2-)>NO_3^->Cl^-。HCl可以有效再生无烟煤,最佳再生浓度为0.2 mol·L^(-1)。无烟煤重复再生使用4次之后,对NO_2^--N的去除率仍然可达88%。In recent years,the rapid development of industry,agriculture,and urbanization has made the ＂ three-nitrogen＂ pollution of water a popular research topic. Among these three states of nitrogen,nitrite is the most toxic. Thus,the removal of nitrite nitrogen from drinking water is of great importance. In this study,three filter materials,namely,anthracite,porcelain sand,and zeolite,were employed to remove nitrite nitrogen from water. Anthracite showed the highest removal efficiency. Further analysis showed that the adsorption kinetics of the adsorption of nitrite nitrogen by anthracite was best fit by the pseudo-second-order kinetic model and the Freundlich adsorption model. The removal efficiency of nitrite nitrogen was affected by the pH,with the optimum pH values being 6 to 7. Within a certain concentration range,increasing the initial concentration of nitrite nitrogen facilitated the removal of nitrite nitrogen by anthracite. Five inorganic anions（ Cl^-,NO_3^-,SO_4^（2-）,CO_3^（2-）,PO_4^（3-）） inhibited the adsorption of nitrite nitrogen on anthracite in the following order： PO_4^（3-） 〉CO_3〉（2-） SO_4〉（2-）NO_3〉 Cl^-. HCl can effectively regenerate anthracite,and the optimal regeneration concentration is 0. 2 mol·L- 1. Approximately 88% of the nitrite nitrogen removal capacity of anthracite was retained after four adsorptiondesorption circles.

关 键 词：无烟煤 亚硝酸盐氮 吸附 去除率 再生 

分 类 号：X703[环境科学与工程—环境工程]