碱度对铁锰复合氧化物去除氨氮和锰的催化活性的影响：性能和机理。
Effect of Alkalinity on Catalytic Activity of Iron-Manganese Co-Oxide in Removing Ammonium and Manganese: Performance and Mechanism.
机构信息
Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
出版信息
Int J Environ Res Public Health. 2020 Jan 27;17(3):784. doi: 10.3390/ijerph17030784.
In this study, a pilot-scale experimental filter system was used to investigate the effect of bicarbonate alkalinity on the activity of an Fe-Mn co-oxide for ammonium and manganese removal from surface water. The results showed that an increase in alkalinity to 150 mg/L (calculated as CaCO) by the addition of NaHCO significantly promoted the activity of the Fe-Mn co-oxide. The ammonium and manganese removal efficiencies of the Fe-Mn co-oxide increased from 40% to 95% and 85% to 100%, respectively. After NaHCO was no longer added, the activity of the filter column remained. Moreover, pH (7.4-8.0) and temperature (12.0-16.0 °C) were not the main factors affecting the activity of the filter, and had no significant effect on the activity of the filter. Further characterization analysis of the Fe-Mn co-oxide filter film showed that after alkalinity was increased, the accumulation of aluminum on the filter media surface decreased from 3.55% to 0.16% and the oxide functional groups changed. This was due to the action of bicarbonate and the residual aluminum salt coagulant in the filter, which caused the loss of Al from the surface of the filter media and weakened the influence of the aluminum salt coagulant on the activity of the Fe-Mn co-oxide; hence, the activity was recovered.
在这项研究中，使用了一个中试规模的实验过滤系统来研究碳酸氢盐碱度对从地表水中去除铵和锰的铁锰共氧化物活性的影响。结果表明，通过添加 NaHCO 将碱度增加到 150mg/L（以 CaCO 计）显著促进了铁锰共氧化物的活性。铁锰共氧化物对铵和锰的去除效率分别从 40%增加到 95%和从 85%增加到 100%。当不再添加 NaHCO 时，过滤柱的活性仍然存在。此外，pH（7.4-8.0）和温度（12.0-16.0°C）不是影响过滤活性的主要因素，对过滤活性没有显著影响。进一步对铁锰共氧化物滤膜的特性分析表明，碱度增加后，过滤介质表面铝的积累从 3.55%降低到 0.16%，氧化物官能团发生变化。这是由于碳酸氢盐和过滤中残留的铝盐混凝剂的作用，导致滤料表面的 Al 损失，削弱了铝盐混凝剂对铁锰共氧化物活性的影响；因此，活性得到了恢复。
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