Αρχειοθήκη ιστολογίου

Σάββατο 4 Ιουνίου 2016

Stable isotope on the evaluation of water quality in the presence of WWTPs in rivers

Abstract

We investigated the distribution of nitrogen compounds in Han River as well as two tributaries of Tancheon and Jungrangcheon. Particularly, we observed the significant releases of NH4+-N from effluent of wastewater treatment plants (WWTPs) in two tributaries that has resulted in the increases of ammonium nitrogen (NH4+-N) in Han River as well as in Tancheon and Jungrangcheon. Due to the increases of NH4+-N in two tributaries, the larger distribution of δ15N-NH4+ was observed than those of δ15N-NO3 in downstream. We calculated the contribution rate of ammonium nitrogen and nitrate nitrogen from effluent to downstream according to the results of stable isotope. The contribution rates of δ15N-NH4+ from effluent to downstream were significant that ranged between 53 and 100 % in Tancheon and between 27 and 100 % in Jungrangcheon. While the contribution of δ15N-NO3 was not significant in Tancheon, it was occasionally observed in Jungrangcheon. These results demonstrated that WWTPs are the major sources of NH4+-N in two tributaries, which caused the distinguishable stable isotope of δ15N-NH4+. Therefore, the stable isotope of δ15N-NH4+ could be a useful parameter or tracer for the evaluation of NH4-N released from WWTPs in rivers.



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