Nitrate and Bisulfide: Monitoring and Patterns in Onondaga Lake, New York, Following Implementation of Nitrification Treatment

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Abstract:

Spatial and temporal patterns of nitrate (NO 3 ) and bisulfide (HS ) are documented in mercury-polluted, culturally eutrophic, Onondaga Lake, New York, following implementation of year-round nitrification treatment at a domestic wastewater treatment plant (WWTP). Measurements of NO 3 and HS in the lake were made with a rapid-profiling, high-resolution, in situ ultraviolet spectrophotometer (ISUS) and were validated by standard laboratory wet chemistry analyses. A nearly 2-fold increase in epilimnetic NO 3 concentrations, prolonged presence of NO 3 , and delay of the onset of HS accumulations in the hypolimnion by approximately 1 month are demonstrated. Detailed vertical patterns resolved within the anoxic hypolimnion first depict operation of the thermodynamically favored NO 3 reduction process(es) and, subsequently, sulfate (SO 4 2−) reduction and the localization of these processes in the lake's sediments. Variations in the effective depth of entry of WWTP discharge into the lake's water column, ranging from surface waters to metalimnetic depths, are demonstrated. Two- and three-dimensional patterns of NO 3 from ISUS profiles depict substantial spatial structure mediated primarily by hydrodynamic processes. In situ ultraviolet spectrophotometer measurements of NO 3 and HS will play an important role in ongoing rehabilitation programs for the lake.

Keywords: bisulfide; lake rehabilitation; nitrate; nitrification; redox; ultraviolet spectrophotometer

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143008X357156

Publication date: May 1, 2009

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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