| Autor: |
Ying-Hua Li, Hai-Bo Li, Xin-Yang Xu, Si-Yao Xiao, Si-Qi Wang, Shu-Cong Xu |
| Předmět: |
|
| Zdroj: |
Water Science & Technology; 2017, Vol. 76 Issue 8, p2158-2166, 9p |
| Abstrakt: |
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) abovewhich 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%. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
