RUAN Zhao-yi,XIE-Yi-jia,HUANG Ting-lin,et al.Enhanced Removal of Ammonia Nitrogen and Manganese from Surface Raw Water by Countercurrent Oxygenation at Low Temperature[J].China Water & Wastewater,2022,38(2022 1 1):40-46.
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Enhanced Removal of Ammonia Nitrogen and Manganese from Surface Raw Water by Countercurrent Oxygenation at Low Temperature

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 2022 1 1 Page: 40-46 Column: Date of publication: 2022-01-01
Author(s):
RUAN Zhao-yi1;  XIE-Yi-jia2;  HUANG Ting-lin1;  CHENG Ya1;  ZHANG Sha-sha1;  ZHANG Shu-nian3;  GENG Biao4
（1. Shaanxi Provincial Key Laboratory of Environmental Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. China Municipal Engineering Central South Design and Research Institute Co. Ltd.， Wuhan 430000， China； 3. Guizhou Architectural Design and Research Institute Co. Ltd.， Guiyang 550081， China； 4. China Municipal Engineering Southwest Design & Research Institute Co. Ltd.， Chengdu 610000， China）
Keywords:
iron?manganese composite oxide film;  manganese;  ammonia nitrogen;  low temperature;  countercurrent oxygenation;  surface raw water
Abstract:
Ammonia nitrogen and manganese in surface raw water were removed by iron?manganese composite oxide film filter material enhanced by countercurrent oxygenation at the bottom of a pilot?scale filter column test system at low temperature. The influences of oxygenation intensity and operational parameters (ammonia nitrogen concentration, manganese concentration and filtration velocity) were investigated, and the microscopic characteristics (morphology, composition and crystal structure) of the oxide film before and after oxygenation were analyzed. When water temperature was 8 ℃, and the concentrations of ammonia nitrogen and manganese in influent were 2.0 mg/L and 3.0 mg/L, the thickness of the filter layer required for complete removal of manganese was reduced from 80 cm to 60 cm, and the ammonia nitrogen concentration in the effluent decreased from 0.7 mg/L to 0 mg/L after countercurrent oxygenation. In addition, higher removal efficiency of ammonia nitrogen was obtained with the increase of oxygenation intensity. When the oxygenation intensity was 0.6 mL/(cm2·min） and the filtration velocity was 7.0 m/h, the removal efficiency of ammonia nitrogen and manganese was the largest. In addition, microscopic characterization analysis results showed that countercurrent oxygenation changed the surface morphology of the filter material under hydraulic action. However, the countercurrent oxygenation did not change the composition and crystal structure of the iron?manganese composite oxide film. Therefore, countercurrent oxygenation can significantly improve the removal efficiency of ammonia nitrogen and manganese in surface raw water by iron?manganese composite oxide film filter material at low temperature.
Last Update: 2022-01-01