scholarly journals The contributions and mechanisms of iron-microbes-biochar in constructed wetlands for nitrate removal from low carbon/nitrogen ratio wastewater

RSC Advances ◽  
2020 ◽  
Vol 10 (39) ◽  
pp. 23212-23220
Author(s):  
Jian Xu ◽  
Xiawei Liu ◽  
Jiaolong Huang ◽  
Manqi Huang ◽  
Tao Wang ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Nitrate Removal ◽  
Schematic Diagram ◽  
Low Carbon ◽  
Carbon Nitrogen Ratio ◽  
Nitrogen Ratio

Schematic diagram of RDCWs system and proposed mechanisms for nitrate removal.

An iron-carbon-activated carbon and zeolite composite filter, anaerobic-aerobic integrated denitrification device for nitrogen removal in low C/N ratio sewage

2019 ◽  
Vol 80 (2) ◽  
pp. 223-231
Author(s):  
Yixuan Xie ◽  
Ajun Wan ◽  
Xingmin Wang ◽  
Hengjie Dong ◽  
Yunpeng Wu
Keyword(s):  
Activated Carbon ◽  
Nitrogen Removal ◽  
High Efficiency ◽  
Strong Shock ◽  
Autotrophic Denitrification ◽  
Low Carbon ◽  
Carbon Nitrogen Ratio ◽  
Nitrogen Ratio ◽  
Composite Filter ◽  
Zeolite Composite

Abstract In this study, we use an anaerobic-aerobic integrated denitrification (Fe/C-ZACID) device with an iron-carbon-activated carbon and zeolite composite filter to remove nitrogen from simulated low carbon-nitrogen ratio (C/N) sewage. The impacts of dissolved oxygen (DO) level, hydraulic retention time (HRT), C/N and nitrate recirculation ratio on denitrification performance were studied. The results show that when HRT was 6 h, DO was 3 ± 0.1 mg/L, influent C/N was 3, and nitrate recirculation ratio was 100%, and removal rates of 95% for ammonia and 85% for total nitrogen (TN) were achieved. A beaker comparison test demonstrated that this synergistic denitrification system included heterotrophic denitrification, physicochemical denitrification, iron autotrophic denitrification and hydrogen autotrophic denitrification, etc. The Fe/C-ZACID device has a high-efficiency nitrogen removal effect for low C/N ratio sewage and strong shock resistance, which provides technical support and a theoretical basis for advanced denitrification of rural domestic sewage.

Aerobic Denitrification Characteristics Research of Pseudomonas Strains HFX08

2012 ◽  
Vol 253-255 ◽  
pp. 903-907
Author(s):  
Xiu Lan Ma ◽  
Yu Xun Shan ◽  
Fang Yuan Zhang ◽  
Ji Hong Wang
Keyword(s):  
Sodium Acetate ◽  
Potassium Nitrate ◽  
Nitrifying Bacteria ◽  
Aerobic Denitrification ◽  
Low Carbon ◽  
Optimum Growth Temperature ◽  
Carbon Nitrogen Ratio ◽  
Nitrogen Ratio ◽  
Northern City ◽  
Growth Temperature Range

In this report, a strains of nitrifying bacteria HFX08 with low temperature and low carbon nitrogen ratio is separated from the activated sludge which is domesticated of the northern city sewage plant in winter. The optimum carbon source for the growth of the strain is sodium acetate, the source of nitrogen is potassium nitrate and the optimum growth temperature range is 10-20°C correspondingly.

scholarly journals Bacteria-supported iron scraps for the removal of nitrate from low carbon-to-nitrogen ratio wastewater

RSC Advances ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 3285-3293 ◽  
Author(s):  
Xiawei Liu ◽  
Jian Xu ◽  
Jiaolong Huang ◽  
Manqi Huang ◽  
Tao Wang ◽  
...  
Keyword(s):  
Nitrate Removal ◽  
Cost Effective ◽  
Low Carbon ◽  
Carbon To Nitrogen Ratio ◽  
Effective System ◽  
Nitrogen Ratio ◽  
Supported Iron

A cost-effective system for nitrate removal was developed with the key role of iron and genus Hydrogenophaga.

Performance and microbial community of a novel PVA/iron-carbon (Fe–C) immobilized bioreactor for nitrate removal from groundwater

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Qiong Wen ◽  
Junfeng Su ◽  
Guoqing Li ◽  
Tinglin Huang ◽  
Lei Xue ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
High Throughput Sequencing ◽  
Nitrate Removal ◽  
Sequencing Analysis ◽  
N Accumulation ◽  
N Removal ◽  
Carbon Nitrogen Ratio ◽  
Nitrogen Ratio ◽  
Denitrification Bioreactor ◽  
Main Component

Abstract An efficient immobilized denitrification bioreactor functioning under anaerobic conditions was developed by combining bacterial immobilization technology with iron-carbon (Fe–C) particles. The effects of key factors on nitrate (NO3 −–N) removal efficiency were invested, such as the carbon-nitrogen ratio (C/N), pH and hydraulic retention time (HRT). Experimental results show that 100.00% NO3 −–N removal efficiency and a low level of nitrite (NO2 −–N) accumulation less than 0.05 mg L−1 were obtained under the condition of a C/N ratio of 3, pH 7.0 and HRT of 6 h. Meteorological chromatographic analysis showed that the final product of denitrification was mainly nitrogen (N2). The main component of precipitation formed in the bioreactor was characterized as Fe3O4 by X-ray diffraction. High-throughput sequencing analysis indicated that the dominant bacterial class in the Fe–C bioreactor was Gammaproteobacteria, while the dominant genera were Zoogloea and Azospira, the relative abundances of which were as high as 23.25 and 15.43%, respectively.

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