Optimization of recovery method for catalytic ammonium/manganese oxidation by active filter media
CHENG Ya, ZHANG Yong-zhi, ZHENG Jia-hui, LI Yu-yang, HUANG Ting-lin
Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract：Taking deactivated filter media as the research object, the effects of three different recovery methods (natural recovery, adding basicity, and re-hanging film) on the catalytic oxidation efficiency of the filter media for ammonium (NH4+-N) and manganese (Mn2+) removal were investigated. The experimental results showed that the NH4+-N removal rate of natural recovery (1#) filter column, adding basicity (2#) filter column and re-hanging film (3#) filter column was above 90% after running for 4d, 2d and 3d, respectively. When the influent NH4+-N concentration increased gradually, the effluent NH4+-N concentration of 3# filter column fluctuated the most, while the effluent nitrite accumulation time of 1# filter column was the longest and the peak value was the highest. The recovery rate of Mn2+ removal activity of all three filter columns was fast. Both 1# and 2# filter columns could completely remove Mn2+ in 2 days and 3# filter column could completely remove the influent Mn2+ within 5days after stopping adding potassium permanganate. The experimental results of the interaction between NH4+-N and Mn2+ showed that 2# filter column performed the best among the three filter columns. Although NH4+-N inhibited the removal of Mn2+, with the increase of influent NH4+-N concentration, the effluent Mn2+ concentration of the 2# filter column was always lower than 0.1mg/L. Mn2+ had no significant effect on NH4+-N removal. The results of XRD analysis showed that the crystallinity of the filter media samples in 3# filter column was poor due to the influence of the new formed oxide film on its surface. Considering the recovery efficiency of NH4+-N and Mn2+ as well as the addition of chemical agents, the natural recovery method is the most suitable recovery method.
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