Removal of ammonium from water by mud cake for groundwater treatment plant:activity formation and application as filter media coating
JIANG Ling-xin, CHENG Ya, HUANG Ting-lin
Xi'an University of Architecture and Technology, Key Laboratory of Northwest Resource, Environment and Ecology, Ministry of Education, Shaanxi Key Laboratory of Environmental Engineering, Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an 710055, China
Abstract：In order to apply the manganese (Mn) rich mud cake collected from underground water works to remove ammonium (NH4+-N) from water, the process of catalytic oxidation activity formation of mud cake (referred as activation) was optimized. The effectiveness and mechanism of NH4+-N removal by activated mud cake were investigated, and the actual operation effect of its coated filter media was examined. The results showed that the optimal conditions of activation were 1.5mg NH4+ and 0.5mg Mn2+ per gram of mud cake, and the maximum NH4+-N removal rate could reach 0.243mg/(g·h). The activated mud cake has developed a higher catalytic oxidation activity than the active film. The NH4+-N removal process by the activated mud cake followed the first-order power-law kinetic model. The activation energy of NH4+-N was 10.70kJ/mol between 298.15K and 318.15K. In the column experiment, when the influent NH4+-N concentration was 1.5mg/L, the start-up time of groundwater and tap water was 9 and 13d, and the maximum removal efficiency could reach 93.5% and 82.42%, respectively. The SEM, EDS, and XPS analyses revealed that the activation process resulted in the formation of abundant pores on the surface of the mud cake and the deposition of manganese oxide (MnOx). It was speculated that the removal of NH4+-N by activated mud cake was mainly through the autocatalytic oxidation of manganese to form MnOx, and then catalytic oxidation of NH4+-N to form nitrate, and finally removal by desorption. The activated mud cake does not contain pathogenic microorganisms such as E. coli and has no risk of heavy metal precipitation. It is an cost-effective, clean, and environmentally friendly water treatment material.
江凌欣, 程亚, 黄廷林. 地下水厂泥饼的活化及其负载滤料去除水中氨[J]. 中国环境科学, 2023, 43(8): 4024-4031.
JIANG Ling-xin, CHENG Ya, HUANG Ting-lin. Removal of ammonium from water by mud cake for groundwater treatment plant:activity formation and application as filter media coating. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4024-4031.
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