Fecal Coliform Removal within a Marshland Upwelling System Consisting of Scatlake Soils
Publication: Journal of Environmental Engineering
Volume 131, Issue 1
Abstract
The marshland upwelling system (MUS) was installed on private camps in the Grand Bay National Estuarine Research Reserve, Moss Point, Mississippi. The system was evaluated for its effectiveness in removing fecal coliforms from settled, raw wastewater. A suite of studies was performed at flow rates of 1.9, 2.8, and 5.5 L/min and an injection frequency of 30 min every 3 h to investigate fecal coliform removal. An additional study was performed at a flow rate of 2.8 L/min and an injection frequency of 15 min every hour. Overall, the MUS consistently maintained fecal concentrations below effluent regulatory standards for shellfish harvesting waters (14 most probable number of colonies per 100 mL). Mean influent concentrations of 55,269±2,218,016 colony forming units (CFU)/100 mL were reduced to effluent counts of 2.7±14.07 CFU/100 mL (observed in the 1.5 m wells). Three- to four-log reductions in influent counts were observed over the initial 1.4 from the injection well. The overall removal followed a first-order decay relationship with respect to vector distance, resulting in removal rate constants ranging from 5.6 to 6.6/m and predicted surface concentrations approaching 0 CFU/100 mL. The 2.8 L/min for 30 min every 3 h treatment provided the best effluent quality.
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Acknowledgments
This research was made possible by the Cooperative Institute for Coastal and Estuarine Environmental Technology. The writers would also like to thank Carl Anderson, Katherine Hanson, Jon Bergeron, and Aubrey Lipham for their assistance in performing various laboratory analyses on the field samples.
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© 2004 ASCE.
History
Received: Aug 13, 2002
Accepted: Sep 23, 2003
Published online: Jan 1, 2005
Published in print: Jan 2005
Notes
Note. Associate Editor: Mark J. Rood
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