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AUTOTROPHIC SULFUR OXIDIZING DENITRIFICATION FOR TOTAL NITROGEN REMOVAL IN ON SITE WASTEWATER TREATMENT SYSTEMS

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Abstract:

The overall objective of this research was to develop a reliable and easy to operate method for removing total nitrogen from the effluent of on-site wastewater treatment systems. The process relies on sulfur oxidizing denitrifying bacteria in upflow packed bioreactors. Sulfur oxidizing autotrophic denitrification consumes alkalinity; therefore, it is necessary to add a source of alkalinity to control the pH. This study investigated the use of limestone, marble chips and crushed oyster shell as sources of alkalinity.

Two bench-scale upflow column reactors and two field-scale bioreactors were constructed and packed with sulfur pellets and an alkalinity source. The field scale bioreactors (~ 200 L each) were installed at the Massachusetts Alternative Septic System Test Center in Sandwich, Ma. When oyster shell was used as alkalinity source, the field bioreactors showed a high degree of nitrogen removal (average of 80%), with the effluent NO3 - - N concentration consistently below 8 mg/L; while the bench scale bioreactors had an average nitrogen removal of 82 % and a maximum nitrogen removal of 99.9 %.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864705783867071

Publication date: January 1, 2005

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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