Exploratory study of nitrites, nitrates and ammoniacal nitrogen in the urban drainage of Guatemala

Abstract

The exploratory study on nitrites, nitrates and ammoniacal nitrogen in urban drainage in Guatemala City examines the presence of these compounds in urban drains. The presence of these elements is analyzed in an exploratory manner in the residential connections of entities that generate wastewater for hospitals and offices, as well as in the discharge of the drainage into the receiving body. The main objective of the study is to determine which compound has the greatest presence in urban wastewater. 13 monitoring points were characterized, including five household connections, five manholes and three direct discharge collectors. The results show that nitrates, with an average value of 42,714 mg/L, are the most abundant. It is followed by ammoniacal nitrogen with an average value of 25.856 mg/L, equivalent to 34.82 mg/L of ammonium. The average concentrations of nitrates (42,714 mg/L) are 65.2% higher than the average concentration of ammoniacal nitrogen (25,856 mg/L). The conclusions indicate that drainage systems favor nitrification, transforming ammoniacal nitrogen into nitrates. This study highlights the importance of understanding the dynamics of these compounds in drains. Understanding these dynamics will allow us to better address the impacts on the environment, public health and wastewater treatment.