Related Experiment Video
Updated: May 11, 2026

Biogas Purification through the use of a Microalgae-Bacterial System in Semi-Industrial High Rate Algal Ponds
Published on: March 22, 2024
Nitrogen removal in micro-polluted surface water by the combined process of bio-filter and ecological gravel bed
He Sheng-Bing1, Gao Jian-Wen, Chen Xue-Chu
1School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai, China. heshengbing@sjtu.edu.cn
Abstract:
Nitrogen removal in micro-polluted surface water by the combined process of a bio-filter and an ecological gravel bed was studied. Sodium acetate was added into micro-polluted surface water as carbon source and the nitrogen removal under different C/N ratio, hydraulic load and temperature were investigated. The results showed that the variations in C/N ratio, hydraulic load and temperature have significant influence on nitrogen removal in bio-filter. It was found that the denitrification rate was above 90% when C/N ratio reached 10; also, the denitrification was inhibited at low water temperature (2-10 °C); at the condition of water temperature above 20 °C, C/N ratio 10, hydraulic load 8 m(3)/(m(2) h), the combined process obtained the nitrogen removal of more than 90%, and the residual organics could be removed in ecological gravel bed.
Related Concept Videos
Bioremediation
Microbial Bioremediation of Hydrocarbons
Freshwater Microbial Ecology
Environmental Applications of Microorganisms
Microbial Bioremediation of Uranium
Microbial Leaching

