Microbial and isotopomer analysis of N2O generation pathways in ammonia removal biofilters

Kong, Xianwang; Ying, Shihao; Yang, Liangcheng; Xin, Yicong; Cai, Zhen; Zhu, Songming; Liu, Dezhao

doi:10.1016/j.chemosphere.2020.126357

Cited by 5 publications

(6 citation statements)

References 28 publications

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“…With biofiltration systems, about half of the inlet NH 3 is converted to nitrites or nitrates, and the other half is absorbed into the water as ammonium ( Ottosen et al, 2011 ; Yasuda et al, 2017 ). Both ammonia oxidizer and denitrifier can produce N 2 O in a biofilter, but the majority of N 2 O was generated from denitrification ( Kong et al, 2020 ). Maia et al (2012a ) pointed that higher EBRT may result in non-uniform oxygen distribution, which favors conditions for denitrification to generate N 2 O.…”

Section: Resultsmentioning

confidence: 99%

“…N 2 O is considered normal at biofilters treating NH 3 -containing air, being a byproduct of nitrification and denitrification, and the pathways of N 2 O formation reported in the literature, however, are complex. Kong et al (2020) found that the inlet NH 3 concentration can affect the nitrification process and the substrate availability for denitrification. In the present study, high inlet loads of NH 3 promoted N 2 O generation, which were consistent with the other study ( Kong, et al, 2020 ); the denitrification is the main pathway for N 2 O formation.…”

Section: Resultsmentioning

confidence: 99%

“… Kong et al (2020) found that the inlet NH 3 concentration can affect the nitrification process and the substrate availability for denitrification. In the present study, high inlet loads of NH 3 promoted N 2 O generation, which were consistent with the other study ( Kong, et al, 2020 ); the denitrification is the main pathway for N 2 O formation.…”

Section: Resultsmentioning

confidence: 99%

“…However, one major complication during composting is the odor emission ( Cheng and Hu, 2010 ; Huang et al, 2012 ; Paulot, et al, 2014 ), which not only poses a problem to the general public and environmental health but also causes adverse effects on vegetation surrounding the composting plants ( Han et al, 2019 ). Ammonia (NH 3 ) is considered the major contributor to odor from composting ( Zhang et al, 2016 ; Zhu et al, 2016 ), and the precursors of particulate matter can be produced by the reactions of NH 3 with sulfuric and nitric acid aerosols ( Pinder, et al, 2007 ; Renner and Wolke, 2010 ; Kong et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have focused on the physical, chemical, and biological parameters influencing the biofiltration process ( Park, et al, 2002 ; Yuan et al, 2019 ). A number of studies have shown that nitrous oxide (N 2 O) generation in biofilters is often accompanied by NH 3 removal ( Maia et al, 2012b ; Yang et al, 2014a ; Kong et al, 2020 ). Akdeniz and Janni (2012) observed that N 2 O generation ranged from −29.2% to 4.0% for a flat-bed biofilter with an empty bed retention time (EBRT) of 5s.…”

Section: Introductionmentioning

confidence: 99%

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Greenhouse Gas Emissions From Biofilters for Composting Exhaust Ammonia Removal

Shang

Zhou

Tao

et al. 2022

Front. Bioeng. Biotechnol.

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Emissions of odorous compounds, such as ammonia (NH3), from composting have negative agronomic and environmental impacts. A biofilter is widely used for NH3 removal, with one of its potential detrimental by-products being nitrous oxide (N2O), which is a higher warming potential greenhouse gas (GHG). The aim of the study was to evaluate the effect of empty bed retention time (EBRT) on GHG emissions from biofilters for removing NH3 from composting. Composting experimental trials lasted 6 weeks, and composting materials were mixtures of dead pigs and manure. Three groups of biofilters with 1.2 m-height, 0.3 m-inner diameter, and 1.0 m media depth were conducted with EBRT of 30, 60, and 100s, respectively. Each treatment was performed in triplicate, and the gas was monitored using the dynamic emission vessel method. The Spearman’s correlation analysis showed a significantly positive correlation between inlet concentrations (ICs) of NH3 and increased N2O concentrations: ρ = 0.707, 0.762, and 0.607 with p ≤ 0.0001 for biofilters with EBRT of 30, 60, and 100s, respectively. The fraction of NH3-N denitrified into N2O-N in biofilters with EBRT of 60 and 100s was higher than that with EBRT of 30s. The total global warming potential (GWP) increased by 126%, 162%, and 144% for biofilters with EBRT of 30, 60, and 100s, respectively. These results indicated that biofilters with longer EBRT will lead to higher GWP production. Future research on odorous mitigation for composting with biofilters should focus more on greenhouse gas emissions.

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