| 亚铁氧化反硝化生物膜反应器中铁矿物的多样性及其对重金属Cd的吸附 |
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| 引用本文： | 粟畅,李颖芬,严兴,种云霄.亚铁氧化反硝化生物膜反应器中铁矿物的多样性及其对重金属Cd的吸附[J].环境工程,2020,38(5):76-83. |
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| 作者姓名： | 粟畅 李颖芬 严兴 种云霄 |
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| 作者单位： | 1. 华南农业大学 资源环境学院, 广州 510642; |
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| 基金项目： | 国家自然科学基金;科技计划 |
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| 摘 要： | 亚铁氧化反硝化过程,是指亚铁氧化和NO3--N还原相结合的生物矿化过程,该过程不仅可以实现水中NO3--N脱除,还可以得到对多种污染物有较强吸附去除能力的铁矿物。构建了亚铁氧化反硝化过程的连续流式生物膜反应器,分析了反应器运行3个月后内部生成的颗粒物特性及其对重金属镉(Cd)的吸附效果。结果表明:反应器内不同位置会生成颗粒成分不同的铁矿物,下部和中部以菱铁矿为主,上部以针铁矿为主。这些颗粒均具有较大的比表面积和多种有利于吸附的有机官能团,对于水中Cd2+具有较强的吸附能力,不同位置形成的颗粒物的吸附去除率从大到小依次为出水>上部>中部>下部,去除率均可达到84%以上,吸附动力学和热力学方程更符合准二级动力学方程和Freundlich模型。
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| 关 键 词： | 亚铁氧化反硝化 铁矿物 生物膜反应器 镉 吸附特性 |
| 收稿时间： | 2019-06-03 |
DIVERSITY OF IRON MINERALS AND THEIR ADSORPTION TO Cd IN FERROUS OXIDATION AND DENITRIFICATION BIOFILM REACTOR |
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| SU Chang,LI Ying-fen,YAN Xing,CHONG Yun-xiao.DIVERSITY OF IRON MINERALS AND THEIR ADSORPTION TO Cd IN FERROUS OXIDATION AND DENITRIFICATION BIOFILM REACTOR[J].Environmental Engineering,2020,38(5):76-83. |
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| Authors: | SU Chang LI Ying-fen YAN Xing CHONG Yun-xiao |
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| Affiliation: | 1. College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China;2. Jiangmen City Ecological Environment Bureau, Jiangmen 529000, China;3. Guangzhou Water Purification Company Limited, Guangzhou 510627, China |
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| Abstract: | Nitrate-dependent anaerobic ferrous iron oxidation refers to the biomineralization process coupled with ferrous oxidation and nitrate nitrogen reduction, which not only has the effect of denitrification on sewage, but also can obtain a series of iron minerals with strong adsorption and removal ability for multi pollutants. In this study, we constructed a continuous flow biofilm reactor based on this process for wastewater denitrification treatment, and analyzed the characteristics of particulate matters generated internally after three months of operation and their adsorption effect on cadmium (Cd). The results showed that the granules in different positions of the reactor contain different iron minerals, the bottom and middle particles were dominated by siderite, and the top particles were dominated by goethite. These particles had a large specific surface area and a variety of organic functional groups for adsorption, and strong adsorption capacity for Cd2+ in water. The adsorption removal rate of different positions of the reactor was in sequence of effluent>top>middle>bottom, all above 84%. The kinetic and thermodynamic equations complied well with the pseudo second-order model and Freundlich isotherms model, respectively. |
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