Estimativa de emissões de nitrogênio reativo na Universidade Federal de Sergipe, Campus São Cristóvão

Abstract

The chemical element Nitrogen (N) in its molecular form (N2), composes 78% of atmospheric air and is characterized by being inert and stable. In addition to N2, there are several nitrogen-based compounds, such as ammonia (NH3), ammonium (NH4), nitrate (NO3), nitrite (NO2), nitrous oxide (NO) etc. These are called reactive nitrogen (Nr) since they have a participatory frequency of chemical reactions. Among these forms, the most toxic is an ammonia, being the main cause of eutrophication of water bodies. The Nr can be generated in electric discharges, in the factory chimneys, in the exhaust of vehicles, among others. Anthropic actions have altered the natural cycle of the element and promoting disastrous consequences from the socioeconomic and environmental point of view by raising significantly as Nr emissions to atmosphere. Considering the relevance of this topic, it was decided to quantify as Nr emissions in the São Cristóvão Campus of the Federal University of Sergipe (UFS), resulting from human activities in this campus, as well as to propose alternatives to reduce its emission. It was concluded that the main source of Nr in the UFS comes from air transport, with 10,354.9 kg N a year-1, followed by energy with 1,470.45 kg N year-1. Public policies and environmental awareness campaigns are among measures to alleviate this problem