催化氧化除氨氮/锰滤料活性恢复方式优化研究

以催化氧化除氨氮/锰失活滤料为研究对象,考察了3种不同恢复方式(自然恢复,投加碱度,再次挂膜)对滤料催化氧化氨氮、锰效能的影响.结果表明,自然恢复(1#)滤柱,投加碱度(2#)滤柱,再次挂膜(3#)滤柱分别于4,2,3d后氨氮去除率达到90%以上;逐渐提高氨氮浓度,3#再次挂膜滤柱出水氨氮浓度波动最大,1#自然恢复滤柱恢复期间出水亚硝氮积累时间最长且峰值最高.3根滤柱催化氧化去除锰活性恢复速度均较快.1#自然恢复滤柱和2#碱度恢复滤柱均能在2d内将锰完全去除.3#挂膜滤柱是在停止投加高锰酸钾后5d内实现将进水锰完全去除.氨氮和锰的相互影响实验结果表明,3根滤柱中投加碱度(2#)滤柱表现最优.尽管氨氮抑制锰的去除,但是投加碱度滤柱随着进水氨氮浓度的升高出水锰浓度始终低于0.1mg/L;锰对氨氮的去除影响不显著.XRD分析结果表明,受其表面负载新生成氧化膜的影响,高锰酸钾重新挂膜滤柱的滤料样品的结晶度较差.综合考虑氨氮和锰的活性恢复效率以及挂膜过程中药品的投加,提出采用自然恢复方式最适.

Optimization of recovery method for catalytic ammonium/manganese oxidation by active filter media

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.