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Laboratory Investigation of Mineralization of Refractory Nitrogen from Sewage Treatment Plants

Author:
Benoit, Gaboury, Wang, Peng
Source:
Environmental management 2017 v.60 no.6 pp. 1171-1176
ISSN:
0364-152X
Subject:
ammonium, estuaries, hypoxia, mineralization, models, nitrates, nitrogen, sewage treatment, wastewater, wastewater treatment, Connecticut
Abstract:
Laboratory studies were conducted and modeled to evaluate whether refractory organic nitrogen in tertiary-treated wastewater effluent could become bioavailable by conversion to mineral forms. Multiday incubations of effluent collected from the Branford and New Haven, Connecticut, waste water treatment plants (WWTP) revealed low but steady conversion of organic nitrogen to nitrate (NO₃ ⁻). In Branford, the principal form of organic nitrogen was dissolved, and in New Haven it was particulate. Modeling suggested that in both the cases conversion to NO₃ ⁻ from organic forms occurred at several per cent per day, and appeared to happen via the intermediary NH₄ ⁺. The results suggest that organic nitrogen may be an important source of bioavailable N, contributing to the problem of hypoxia in Long Island Sound and other estuaries.
Agid:
5846483