Nitrous oxide production during nitrification from organic solid waste under temperature and oxygen conditions

Abstract

Landfill aeration can accelerate the biological degradation of organic waste and reduce methane production; however, it induces nitrous oxide (N2O), a potent greenhouse gas. Nitrification is one of the pathways of N2O generation as a by-product during aerobic condition. This study was initiated to demonstrate the features of N2O production rate from organic solid waste during nitrification under three different temperatures (20°C, 30°C, and 40°C) and three oxygen concentrations (5%, 10%, and 20%) with high moisture content and high substrates' concentration. The experiment was carried out by batch experiment using Erlenmeyer flasks incubated in a shaking water bath for 72 h. A duplicate experiment was carried out in parallel, with addition of 100 Pa of acetylene as a nitrification inhibitor, to investigate nitrifiers' contribution to N2O production. The production rate of N2O ranged between 0.40 × 10(-3) and 1.14 × 10(-3) mg N/g-DM/h under the experimental conditions of this study. The rate of N2O production at 40°C was higher than at 20°C and 30°C. Nitrification was found to be the dominant pathway of N2O production. It was evaluated that optimization of O2 content is one of the crucial parameters in N2O production that may help to minimize greenhouse gas emissions and N turnover during aeration.

Gaseous Emissions from the Composting Process: Controlling Parameters and Strategies of Mitigation

“…Methane is normally formed during the composting process due to anaerobic condition that could be established in some parts of the composted material such as middle zones of a pile, which suffer from insufficient diffusion of oxygen [12,24]. However, nitrous oxides are produced due to nitrification and denitrification [42], taking into account that other conditions such as temperature, nitrate concentration, and aerobic conditions influence these emissions [43].…”

A Critical Review on Nitrous Oxide Production by Ammonia-Oxidizing Archaea

“…Temperature can significantly affect nitrification by influencing the microbial activity of ammonia oxidizers. , The change in microbial metabolisms would in turn influenced the archaeal N 2 O production. The suitable temperature range for nitrification microbial activity is around 5–40 °C. , Both AOA and AOB could exhibit positive or negative correlation with temperature regarding abundance and microbial activity depending on the specific temperature range (Figure ). , Temperature variation can influence N 2 O production driven by AOA or AOB to different extent.…”

Decomposition of N2O at low temperature over Co3O4 prepared by different methods

“…Furthermore, combustion sources [4,5] and chemical processes [2] enhanced the N 2 O production [6][7][8][9]. There are numerous methods can be employed for N 2 O reduction which includes: thermal decomposition [10][11][12][13], selective adsorption [14][15][16], the application of microwave plasma technology [17][18][19], and catalytic destruction [20,21]. Among them, catalytic destruction has advantages compare to alternative technologies for controlling N 2 O emissions, for example, low energy costs when compared with thermal decomposition [22,23].…”