高铁锰氨氮地下水锰极限质量浓度研究

The maximum manganese concentration of groundwater containing high concentration of iron,manganese and nitrogen

为研究生物除铁除锰滤柱对高铁锰氨氮地下水中锰的极限质量浓度，采用培养成熟并稳定运行一段时间的滤柱，逐步提高其进水锰的质量浓度，考察锰的极限质量浓度．结果表明：在进水总铁、氨氮质量浓度分别为5—10、0．9～1．3mg／L，水温为8℃，滤速为6m／h的实验条件下，当进水溶解氧约8．5mg／L时，锰的极限质量浓度为7．5mg／L；溶解氧大于10mg／L时，锰极限质量浓度为10．5mg／L；锰质量浓度升高对铁和氨氮的去除没有影响．沿程分析发现：沿滤层向下，相同厚度滤料除锰量逐渐减少；锰质量浓度升高过程中，氨氮的沿程去除没有变化．锰的极限质量浓度受溶解氧限制，溶解氧越高，极限质量浓度越高．

To investigate the maximum concentration of manganese of groundwater containing high concentration of iron, manganese and ammonia nitrogen groundwater in a biological iron and manganese removal filter, a mature and steady operated biological filter was used, and the concentration of manganese in influent was increased gradually. Results showed that in the experimental conditions of the concentration of total iron and ammonia nitrogen was 5-10, 0.9-1.3 mg/L, respectively, the temperature of raw water was 8 ℃, and the flow rate was 6 m/h, when the dissolved oxygen （DO） in influent was about 8.5 mg/L, the maximum concentration of manganese was 7.5 mg/L; when the DO was above 10 rag/L, the maximum concentration of manganese was 10. 5 mg/L. There was no influence of manganese concentration increased in influent on iron and ammonia removal, Variation of iron, manganese and ammonia nitrogen removal along the filter showed that along the filter depth, manganese removal quantity reduced in the same depth of the filter, the efficiency of ammonia removal did not change along the filter depth in manganese concentration increased process. The maximum concentration of manganese was limited by DO, the DO in influent was higher, the concentration of manganese was higher.