LI Gui-bai,YANG Hai-yang,ZHONG Lin,et al.Effect of Manganese Oxides Film Activity on Removal Efficiencies of Manganese and Ammonia Nitrogen by Contact Oxidation[J].China Water & Wastewater,2020,36(21 21):1-6.
Effect of Manganese Oxides Film Activity on Removal Efficiencies of Manganese and Ammonia Nitrogen by Contact Oxidation
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
21 21
Page:
1-6
Column:
Date of publication:
2020-11-01
- Keywords:
- ferrous iron; manganese active oxides film; manganese; ammonia nitrogen; groundwater; iron and manganese oxidizing bacteria
- Abstract:
- The water containing three different concentrations of ferrous iron was used to contaminate the mature manganese active oxides film, and the effect of manganese oxides film activity on removal efficiencies of manganese and ammonia nitrogen from groundwater during long-term operation was investigated. The increase of ferrous iron concentration could affect the catalytic oxidation activity of the manganese active oxides film, resulting in the manganese concentration in the effluent exceeding the standard for several months. However, it had no significant effect on ammonia nitrogen removal. The regeneration time of manganese active oxides film increased with the increase of ferrous iron concentration.When the ferrous iron concentration in the influent was 5 mg/L, 10 mg/L and 20 mg/L, the regeneration time was 92 d, 104 d and 112 d, respectively. The iron and manganese oxidizing bacteria were less affected by the high concentration of ferrous iron. During the 125 days operation period, the number of iron and manganese oxidizing bacteria on the surface of the upper filter material reached 105 CFU/cm3 and continued to increase.However, the removal efficiency of manganese deteriorated significantly. Therefore, catalytic oxidation of the manganese active oxides film played a major role in the process of manganese removal, while the contribution of biotic oxidation was minor.
Last Update:
2020-11-01