Solid-Phase Fe(II)-Mediated Autotrophic Denitrification for Nitrate Removal from Wastewater with a Low Carbon-to-Nitrogen Ratio

2020 ◽  
Vol 146 (7) ◽  
pp. 04020070
Author(s):  
Li Wang ◽  
Lianfang Zhao ◽  
Li He
Keyword(s):  
Solid Phase ◽  
Nitrate Removal ◽  
Autotrophic Denitrification ◽  
Low Carbon ◽  
Carbon To Nitrogen Ratio ◽  
Nitrogen Ratio

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.

Nitrate removal from groundwater by hydrogen-fed autotrophic denitrification in a bio-ceramsite reactor

2014 ◽  
Vol 69 (12) ◽  
pp. 2417-2422 ◽  
Author(s):  
Dan Chen ◽  
Kai Yang ◽  
Hongyu Wang ◽  
Bin Lv
Keyword(s):  
Water Temperature ◽  
Nitrate Removal ◽  
Denitrifying Bacteria ◽  
Autotrophic Denitrification ◽  
Optimum Temperature ◽  
Carbon To Nitrogen Ratio ◽  
Alkaline Environment ◽  
Experimental Parameters ◽  
Unique Aspect ◽  
Nitrogen Ratio

In this work, the denitrification performance of a bio-ceramsite reactor based on autohydrogenotrophic denitrification was investigated. The effects of various experimental parameters such as nitrate loading, carbon to nitrogen ratio (C/N), water temperature and pH were evaluated during the operation. The unique aspect of this research is that the bio-reactor uses ceramsite as a carrier, which can provide a habitat for autohydrogenotrophic biocoenoses to accrete and grow. The results indicated that the denitrification rate increased as nitrate loading (below 130 mg NO3−-N/L) increased. However, the activity of autohydrogenotrophic denitrifying bacteria was inhibited when nitrate loading was further increased to higher than 130 mg NO3−-N/L. Denitrification efficiency changed slightly with C/N, this system performed well if C/N was more than 0.9. The optimum temperature for the reactor was 25–35 °C. This denitrification system was positively related to pH, as a neutral or alkaline environment was more preferable for the reactor. During the operation, effluent nitrite levels were always maintained below 1.75 mg NO2−-N/L.

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.

scholarly journals Factors controlling nitrous oxide emissions from managed northern peat soils with low carbon to nitrogen ratio

2018 ◽  
Vol 122 ◽  
pp. 186-195 ◽  
Author(s):  
Maarit Liimatainen ◽  
Carolina Voigt ◽  
Pertti J. Martikainen ◽  
Jyrki Hytönen ◽  
Kristiina Regina ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrous Oxide Emissions ◽  
Low Carbon ◽  
Peat Soils ◽  
Carbon To Nitrogen Ratio ◽  
Nitrogen Ratio

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.

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