title: Nitrous oxide emissions in a membrane bioreactor treating saline wastewater contaminated by hydrocarbons.
abstract: The joint effect of wastewater salinity and hydrocarbons on nitrous oxide emission was investigated. The membrane bioreactor pilot plant was operated with two phases: i. biomass acclimation by increasing salinity from 10gNaClL(-1) to 20gNaClL(-1) (Phase I); ii. hydrocarbons dosing at 20mgL(-1) with a constant salt concentration of 20gNaClL(-1) (Phase II). The Phase I revealed a relationship between nitrous oxide emissions and salinity. During the end of the Phase I, the activity of nitrifiers started to recover, indicating a partial acclimatization. During the Phase II, the hydrocarbon shock induced a temporary inhibition of the biomass with the suppression of nitrous oxide emissions. The results revealed that the oxic tank was the major source of nitrous oxide emission, likely due to the gas stripping by aeration. The joint effect of salinity and hydrocarbons was found to be crucial for the production of nitrous oxide.
authors: Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
authors: Giorgio
authors: G
authors: Mannina
authors: Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
authors: Alida
authors: A
authors: Cosenza
authors: Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy. Electronic address: daniele.ditrapani@unipa.it.
authors: Daniele
authors: D
authors: Di Trapani
authors: Dipartimento di Scienze Agrarie e Forestali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
authors: Vito Armando
authors: VA
authors: Laudicina
authors: Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
authors: Claudia
authors: C
authors: Morici
authors: NTNU - Norwegian University of Science and Technology, Department of Hydraulic and Environmental Engineering, 7491 Trondheim, Norway.
authors: Hallvard
authors: H
authors: Ødegaard
mesh_terms: D001673:Biodegradation, Environmental; D018533:Biomass; D019149:Bioreactors; D006838:Hydrocarbons / Q000378:metabolism*; D009609:Nitrous Oxide / Q000032:analysis*; D054712:Salinity; D012965:Sodium Chloride / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry / Q000378:metabolism
chemical_list: D006838:Hydrocarbons; D009609:Nitrous Oxide; D012965:Sodium Chloride; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Environmental protection; Greenhouse gas emissions; Membrane bioreactors; Nitrous oxide; Salinity and hydrocarbon