AI Article Synopsis
- The study examined how wastewater salinity and hydrocarbons affect nitrous oxide emissions in a membrane bioreactor.
- During the first phase, increasing salinity showed a link to nitrous oxide emissions, with nitrifiers starting to recover by the end.
- In the second phase, adding hydrocarbons temporarily inhibited biomass activity, reducing nitrous oxide emissions, and highlighting the oxic tank as a key source of these emissions.
Article 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.
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| http://dx.doi.org/10.1016/j.biortech.2016.07.124 | DOI Listing |
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