ZHANGJie,WENGang,LIKai,et al.Simultaneous Catalytic Oxidation Removal of Ammonia Nitrogen and Manganese from Groundwater in Bi-flow Filtration System[J].China Water & Wastewater,2022,38(21):1-11.
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Simultaneous Catalytic Oxidation Removal of Ammonia Nitrogen and Manganese from Groundwater in Bi-flow Filtration System

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第21期 Page: 1-11 Column: Date of publication: 2022-11-01
Author(s):
ZHANG　Jie1; 2;  WEN　Gang1; 2;  LI　Kai1; 2;  HU　Rui-zhu1; 2;  CHENG　Ya1; 2;  HUANG　Ting-lin1; 2
（1. Key Laboratory of Northwest Water Resource， Environment and Ecology ， School of Municipal and Environmental Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. Shaanxi Key Laboratory of Environmental Engineering， School of Municipal and Environmental Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China）
Keywords:
bi-flow filter;  active filter material;  catalytic oxidation;  ammonia nitrogen;  manganese
Abstract:
In the pilot-scale conditions, ammonia and manganese were simultaneously removed from groundwater by bi-flow catalytic oxidation filter system with iron-manganese co-oxide films and was compared with uni-flow filter. The bi-flow filter could shorten the filter layer thickness and increase the hydraulic load, and the dissolved oxygen derived from the raw water was used to carry out catalytic oxidation reaction. The results showed that low concentration of ammonia nitrogen (<1.5 mg/L) and manganese (<3.0 mg/L) were simultaneously removed to meet the Standards for Drinking Water Quality (GB 5749-2022) by bi-flow catalytic oxidation filter system. Compared with uni-flow filtration, the hydraulic load of bi-flow filter was doubled and the backwash period was shortened by 19% when the filtration rate was 8.0 m/h, but the total removal of ammonia and manganese by filter material were increased by 56.6% and 69.5% in the same time, respectively. The volumetric oxidation rate was increased by 3 times. Therefore, the bi-flow catalytic oxidation filtration could make full use of the dissolved oxygen in raw water and full layer oxidation capacity of active filter material, and greatly improve the water treatment volume and efficiency under the same conditions. In addition, the SEM, BET and EDS characterizations results of the filter material showed that the specific surface area increased by 4 folds, and the new oxide film was formed and attached on the surface of the active filter material during the operation. There was no significant difference in active oxide films between the upper and lower filter material.
Last Update: 2022-11-01