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In Situ Septic Tank Effluent Denitrification Using a Sulfur-Limestone Process

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Abstract:

Septic tanks are the second largest source of groundwater nitrate contamination. In this study, the feasibility of coupling a conventional lateral field with a sulfur-limestone (S/L) layer to treat nitrate in septic tank effluent was investigated using column reactors to simulate the septic tank soil adsorption system. The effects of different hydraulic loading rates, nitrogen loading rates, depth of SIL layers, and ratio of SIL-to-gravel on reactor performance were investigated. The profiles of ammonium, nitrite, nitrate, sulfate, calcium, and other parameters along the depth of reactors were measured. Significant nitrification was observed in the sand layer, while significant denitrification was observed in the S/L layer. Sulfate and hardness were produced in accordance with stoichiometric relationships. The results demonstrate that the S/L method is very effective in denitrification, while production of sulfate and hardness and existence of sulfide in effluent may be limiting factors in its application.

Keywords: DENITRIFICATION; GROUNDWATER; NITRATE; SEPTIC TANK; SULFUR-LIMESTONE

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143096X122447

Publication date: November 1, 1999

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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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