Dinitrogen oxide (N2O) emission in the treatment of urban wastewater via nitrite: influence of liquid kinetic rates

2016 ◽  
Vol 74 (12) ◽  
pp. 2784-2794 ◽  
Author(s):  
Anna Laura Eusebi ◽  
Diego Cingolani ◽  
Matteo Spinelli ◽  
Giorgio Passserini ◽  
Stefano Carletti ◽  
...  
Keyword(s):  
Continuous Process ◽  
Ammonia Concentration ◽  
N2o Emission ◽  
Ammonia Oxidizing Bacteria ◽  
Urban Wastewater ◽  
N2o Production ◽  
Mass Load ◽  
Kinetic Rates ◽  
Urban Wastewater Treatment ◽  
Dinitrogen Oxide

N2O emission was studied in a continuous process via nitrite for real urban wastewater treatment. The relationship between the gaseous forms and the liquid kinetic rates of nitritation and denitritation was investigated. N2O mass load and global nitrogen mass balance were quantified. The emission factor of the N2O (gN2Oemitted/kg mixed liquor volatile suspended solids [MLVSS]/d) was calculated. Incrementing the nitritation rate permits the reduction of N2O emission by 78%. Instead, an N2O decrease of 93% was observed by increasing the denitritation velocity. The determinant role of the anoxic phase in the production of dinitrogen oxide was identified. The contribution of N2O emission from the anoxic phase (4.8 gN2O-N/kgMLVSS/d) was enhanced under limiting denitritation conditions (kd lower than 0.08 kgNOx-N/kgMLVSS/d). N2O production increased by five times with the accumulation of nitrites in the solution up to 200 mg/L. Strict correlation between free ammonia concentration and nitritation rate was found as a possible signal of further ammonia oxidizing bacteria selection.

N2O emission from full-scale urban wastewater treatment plants: a comparison between A2O and SBR

2013 ◽  
Vol 67 (9) ◽  
pp. 1887-1893 ◽  
Author(s):  
Shichang Sun ◽  
Xiang Cheng ◽  
Sha Li ◽  
Fei Qi ◽  
Yan Liu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Sequencing Batch Reactor ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
N2o Emission ◽  
Full Scale ◽  
Urban Wastewater ◽  
N2o Flux ◽  
Oxic Zone ◽  
Urban Wastewater Treatment

The emission of nitrous oxide (N2O) from full-scale anoxic/anaerobic/oxic (A2O) and sequencing batch reactor (SBR) processes was measured to evaluate N2O emission from urban wastewater treatment plants (WWTPs). The results showed that N2O flux in the A2O WWTP followed an order of A2O-oxic zone > aerated grit tank >> A2O-anaerobic zone > A2O-anoxic zone > final clarifier > primary clarifier, while in the SBR WWTP the order was SBR tank >> swirl grit tank > wastewater distribution tank and within the SBR tank in an order of SBR-feeding period > SBR-aeration period > SBR-settling period > SBR-decanting period. N2O emission from the A2O WWTP was approximately 486.61 kg d−1, 96.9% of which was from the A2O-oxic zone. In the SBR WWTP, the emission of N2O was 339.24 kg d−1 with 99.9% of the total emission coming from the periods of feeding and aeration. There was 6.52% of nitrogen-load in the influent being transformed to the emitted N2O in the SBR WWTP; the percentage was 3.35 times higher than that in the A2O WWTP.

scholarly journals New insights into nitrous oxide emissions in a single-stage CANON process coupled with denitrification: thermodynamics and nitrogen transformation

2020 ◽  
Author(s):  
Fang Fang ◽  
Kai Li ◽  
Jin-Song Guo ◽  
Han Wang ◽  
Ping Zhang ◽  
...  
Keyword(s):  
Carbon Sources ◽  
N2o Emission ◽  
Nitrogen Transformation ◽  
Biofilm Reactor ◽  
Nitrous Oxide Emissions ◽  
N2o Emissions ◽  
Ammonia Oxidizing Bacteria ◽  
N2o Production ◽  
Canon Process ◽  
Heterotrophic Denitrification

Abstract The dynamic characteristics of N2O emissions and nitrogen transformation in a sequencing batch biofilm reactor (SBBR) using the completely autotrophic nitrogen removal over nitrite (CANON) process coupled with denitrification were investigated via 15N isotope tracing and thermodynamic analysis. The results indicate that the Gibbs free energy (ΔG) values of N2O production by the nitrifier denitrification and heterotrophic denitrification reactions were greater than that of NH2OH oxidation, indicating that N2O was easier to produce via either nitrifier and heterotrophic denitrification than via NH2OH oxidation. Ammonia-oxidizing bacteria (AOB) denitrification exhibited a higher fs0 (the fraction of electron-donor electrons utilized for cell synthesis) than NH2OH oxidation. Therefore, AOB preferred the denitrification pathway because of its growth advantage when N2O was produced by the AOB. The N2O emissions by hydroxylamine oxidation, AOB denitrification and heterotrophic denitrification in the SBBRs using different C/N ratios account for 5.4–7.6%, 45.2–60.8% and 33.8–47.2% of the N2O produced, respectively. The total N2O emission with C/N ratios of 0, 0.67 and 1 was 228.04, 205.57 and 190.4 μg N2O-N·g−1VSS, respectively. The certain carbon sources aid in the reduction of N2O emissions in the process.

Challenges encountered when expanding activated sludge models: a case study based on N2O production

2014 ◽  
Vol 70 (7) ◽  
pp. 1251-1260 ◽  
Author(s):  
L. J. P. Snip ◽  
R. Boiocchi ◽  
X. Flores-Alsina ◽  
U. Jeppsson ◽  
K. V. Gernaey
Keyword(s):  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
N2o Emission ◽  
Full Scale ◽  
Ammonia Oxidizing Bacteria ◽  
N2o Formation ◽  
N2o Production ◽  
Parameter Values ◽  
Activated Sludge Models

It is common practice in wastewater engineering to extend standard activated sludge models (ASMs) with extra process equations derived from batch experiments. However, such experiments have often been performed under conditions different from the ones normally found in wastewater treatment plants (WWTPs). As a consequence, these experiments might not be representative for full-scale performance, and unexpected behaviour may be observed when simulating WWTP models using the derived process equations. In this paper we want to highlight problems encountered using a simplified case study: a modified version of the Activated Sludge Model No. 1 (ASM1) is upgraded with nitrous oxide (N2O) formation by ammonia-oxidizing bacteria. Four different model structures have been implemented in the Benchmark Simulation Model No. 1 (BSM1). The results of the investigations revealed two typical difficulties: problems related to the overall mathematical model structure and problems related to the published set of parameter values. The paper describes the model implementation incompatibilities, the variability in parameter values and the difficulties of reaching similar conditions when simulating a full-scale activated sludge plant. Finally, the simulation results show large differences in oxygen uptake rates, nitritation rates and consequently the quantity of N2O emission (GN2O) using the different models.

scholarly journals Effects of the Fertilizer Added with DMPP on Soil Nitrous Oxide Emissions and Microbial Functional Diversity

Agriculture ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 12
Author(s):  
Anna Tedeschi ◽  
Anna De Marco ◽  
Franca Polimeno ◽  
Paul Di Tommasi ◽  
Giuseppe Maglione ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Microbial Biomass ◽  
Microbial Biomass Carbon ◽  
Potato Crop ◽  
N2o Emission ◽  
Nitrous Oxide Emissions ◽  
Nitrification Inhibitors ◽  
Ammonia Oxidizing Bacteria ◽  
N2o Production ◽  
The Impact

Agricultural sites contribute extensively to atmospheric emissions of climate-altering gases such as nitrous oxide. Several strategies have been considered to mitigate the impact of agriculture on climate, among these the utilization of fertilizers added with nitrification inhibitors such as DMPP (3,4-dimethylpyrazole phosphate) may represent a suitable solution. DMPP inhibits the growth and activity of ammonia-oxidizing microorganisms, particularly the ammonia-oxidizing bacteria, which are involved in N2O production. At present, little information is available on the effects of DMPP on the catabolic diversity of soil microbial community. In this study, the N2O emission by soil was performed by using the static chamber technique. The biological determinations of the microbial biomass carbon and the catabolic profile were assessed by measuring the substrate-induced respiration during the entire growing season of a potato crop under two nitrogen treatments: fertilization with and without DMPP. Our results did not show a clear mitigation of N2O emission by DMPP, even if a tendency to lower N2O fluxes in DMPP plots occurred when soil temperatures were lower than 20 °C. Conversely, DMPP deeply affected the microbial biomass and the catabolism of soil microorganisms, exerting a negative effect when it accumulated in excessive doses in the soil, limiting the growth and the capacity of soil microorganism communities to use different substrates.

Economic, energy and carbon footprint assessment of integrated forward osmosis membrane bioreactor (FOMBR) process in urban wastewater treatment

2020 ◽  
Vol 6 (1) ◽  
pp. 153-165 ◽  
Author(s):  
Nur Hafizah Ab Hamid ◽  
Simon Smart ◽  
David K. Wang ◽  
Kaniel Wei Jun Koh ◽  
Kalvin Jiak Chern Ng ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Carbon Footprint ◽  
Membrane Bioreactor ◽  
Forward Osmosis ◽  
Economic Feasibility ◽  
Water Reclamation ◽  
Urban Wastewater ◽  
Potential Applications ◽  
Carbon Footprint Assessment ◽  
Urban Wastewater Treatment

This study systematically explores the potential applications of forward osmosis (FO) membrane based technology in urban wastewater treatment and water reclamation for their techno-economic feasibility and sustainability.

Comparative Kinetic Study of Carrier Type in a Moving Bed System Applied to Organic Matter Removal in Urban Wastewater Treatment

2011 ◽  
Vol 223 (4) ◽  
pp. 1699-1712 ◽  
Author(s):  
J. Martín-Pascual ◽  
C. López-López ◽  
A. Cerdá ◽  
J. González-López ◽  
E. Hontoria ◽  
...  
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Kinetic Study ◽  
Urban Wastewater ◽  
Organic Matter Removal ◽  
Moving Bed ◽  
Urban Wastewater Treatment

Field study on N2O emission from subsurface wastewater infiltration system under variable loading rates and drying-wetting cycles

2017 ◽  
Vol 76 (8) ◽  
pp. 2158-2166 ◽  
Author(s):  
Ying-Hua Li ◽  
Hai-Bo Li ◽  
Xin-Yang Xu ◽  
Si-Yao Xiao ◽  
Si-Qi Wang ◽  
...  
Keyword(s):  
Field Study ◽  
Conversion Rate ◽  
Oxygen Demand ◽  
N2o Emission ◽  
Conversion Ratio ◽  
Gas Chromatograph ◽  
Variable Loading ◽  
N2o Production ◽  
Loading Rates ◽  
Operation Conditions

In this field study, the impacts of influent loadings and drying-wetting cycles on N2O emission in a subsurface wastewater infiltration (SWI) system were investigated. N2O emitted under different operation conditions were quantified using static chamber and gas chromatograph techniques. N2O conversion rate decreased from 6.6 ± 0.1% to 2.7 ± 0.1% with an increase in hydraulic loading (HL) from 0.08 to 0.24 m3/m2·d. By contrast, N2O conversion rate increased with increasing pollutant loading (PL) up to 8.2 ± 0.5% (PL 4.2 g N/m2·d) above which conversion rate decreased, confirming that N2O production was under the interaction of nitrification and denitrification. Taking into consideration the pollutants (chemical oxygen demand (COD), NH4+-N, NO3−-N and total nitrogen (TN)) removal ratio and N2O emission, optimal loading ranges and drying-wetting modes were suggested as HL 0.08–0.12 m3/m2·d, PL 3.2–3.7 g N/m2·d and 12 h:12 h, respectively. The results revealed that in SWI systems, conversion ratio of influent nitrogen to N2O could be between 4.5% and a maximum of 7.0%.

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