Abstract：A dynamic experiment was conducted by coating MnOx on the surface of quartz sand to form MnOx filter media and constructing a filter with it. The start-up period, pollutant removal efficiency and influencing factors of the filter were investigated and the pollutant removal mechanism of the MnOx filter was explored by characterizing the structural changes of MnOx and inactivating the microorganisms on the surface of the filter media. The results showed that the manganese in the effluent of the filter can meet the standard in the first day of operation, and it can achieve the simultaneous and effective removal of manganese and ammonium from water when the filter starts to complete in the 9th day of operation. The maximum average concentrations of manganese and ammonium were 1.4 and 1.6 mg/L respectively at the filtration rate of 6 m/h. The efficient removal of manganese and ammonium could be further enhanced by increasing the dissolved oxygen content in the water. The results of SEM, EDS and XRD analysis showed that during the operation of the filter, MnOxgradually developed from a relatively dense particle accumulation morphology to a porous integrated sponge-like structure, and its composition gradually developed from ramsdellite and birnessite type MnO2 to buserite and birnessite type MnO2, but the elemental composition was relatively stable. Combined with the microbial inactivation experiments on surface of the filter media, it was concluded that the removal of manganese from the filter during the stable operation stage was mainly abiotic, and the removal of ammonium was mainly biological, with chemical catalytic oxidation and adsorption accounting for 16.9%~23.6% and 4.4%~11%, respectively. The results of the study will provide theoretical and technical support for the development of efficient filtration removal technologies for manganese and ammonium using MnOx.
张瑞峰, 杨世莲, 杨靖, 郭英明, 陈希. MnOx同步除锰氨氮滤池的快速启动及污染物去除机制[J]. 中国环境科学, 2023, 43(1): 197-205.
ZHANG Rui-feng, YANG Shi-lian, YANG Jing, GUO Ying-ming, CHEN Xi. Rapid start-up and pollutant removal mechanism of MnOx filter for simultaneous removal of manganese and ammonium. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 197-205.
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