Does carbon-nitrogen ratio affect nitrous oxide emission and spatial distribution in subsurface wastewater infiltration system?. (February 2018)

• Record Type: Journal Article
• Authors: Li, Ying-Hua; Li, Hai-Bo; Xu, Xin-Yang; Wang, Si-Qi; Pan, Jing
• Is Part Of: Bioresource technology. Volume 250(2018)
• Page Start: 846
• Page End: 852
• Publication Date: 2018-02
• Subjects: Subsurface wastewater infiltration system -- Carbon-nitrogen ratio -- Nitrous oxide -- Spatial distribution; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.12.024
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Layered sampling method for N2 O sampling was introduced. Both positive and negative effects exist in CNR relating to N2 O emission. Highest N2 O emission rate was observed at medium CNR (CNR = 6 in this work). 0–75 cm was the main contributor accounting for over 80% of total N2 O emissions. Reoxygenation and shunt distributing sewage would benefit N2 O emission attenuation. Abstract: In order to evaluate the effects of carbon-nitrogen ratio (CNR) on nitrous oxide (N2 O) emission and quantify N2 O spatial distribution in subsurface wastewater infiltration system (SWIS), layered sampling method was introduced. Results showed that low N2 O emission rate (1.43 mg/m 2 ·h) and conversion rate (0.1% accounting for influent TN) were obtained when CNR increased up to as high as 10. The highest N2 O emission (3.14 mg/m 2 ·h) was observed at CNR of 6. Instead, independent of CNR variations, 0–75 cm was the main contributor for N2 O emission. The results indicated that layered sampling method is necessary in revealing N2 O spatial distribution in soil layers. Carbon source availability and nitrogen load and their ratio (i.e. CNR) determined N2 O emission rate. CNR of medium level leads to an increase in N2 O emission rate.