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Effects of Aeration on Water Quality from Septic System Leachfields

^a Geomatrix, LLC, Killingworth, CT 06419
^b Laboratory of Soil Ecology and Microbiology, University of Rhode Island, Kingston, RI 02881

View larger version (37K): [in a new window]   Fig. 1. Schematic diagram of experimental facility (top), lysimeters (middle), and detail of leachfield gas intake (bottom). Drawings are not to scale.

View larger version (40K): [in a new window]   Fig. 2. Time course of pH, dissolved oxygen, five-day biological oxygen demand (BOD5), and temperature of raw wastewater input and of drainage water from aerated lysimeters (AIR) and lysimeters vented to the leachfield (LEACH). The wastewater loading rate was changed from 12 to 4 cm d–1 on 21 Apr. 2003. Temperature was not measured on 12 Feb. 2003. Values are means (n = 3). Bars represent one standard deviation. Significant differences between AIR and LEACH treatments (P < 0.05) for a particular sampling date are indicated with an asterisk (*).

View larger version (26K): [in a new window]   Fig. 3. Time course of fecal coliform bacteria in raw wastewater input and in drainage water from aerated lysimeters (AIR) and lysimeters vented to the leachfield (LEACH). The wastewater loading rate was changed from 12 to 4 cm d–1 on 21 Apr. 2003. Values are means (n = 3). Bars represent one standard deviation. Significant differences between AIR and LEACH treatments (P < 0.05) for a particular sampling date are indicated with an asterisk (*).

View larger version (46K): [in a new window]   Fig. 4. Time course of total N, ammonium N, and nitrate N in raw wastewater input and in drainage water from aerated lysimeters (AIR) and lysimeters vented to the leachfield (LEACH). The wastewater loading rate was changed from 12 to 4 cm d–1 on 21 Apr. 2003. Values are means (n = 3). Bars represent one standard deviation. Significant differences between AIR and LEACH treatments (P < 0.05) for a particular sampling date are indicated with an asterisk (*).

View larger version (42K): [in a new window]   Fig. 5. Time course of total P and phosphate P in raw wastewater input and in drainage water from aerated lysimeters (AIR) and lysimeters vented to the leachfield (LEACH). The wastewater loading rate was changed from 12 to 4 cm d–1 on 21 Apr. 2003. Values are means (n = 3). Bars represent one standard deviation. Significant differences between AIR and LEACH treatments (P < 0.05) for a particular sampling date are indicated with an asterisk (*).

View larger version (22K): [in a new window]   Fig. 6. Time course of sulfate in raw wastewater input and in drainage water from aerated lysimeters (AIR) and lysimeters vented to the leachfield (LEACH). The wastewater loading rate was changed from 12 to 4 cm d–1 on 21 Apr. 2003. Values are means (n = 3). Bars represent one standard deviation. Significant differences between AIR and LEACH treatments (P < 0.05) for a particular sampling date are indicated with an asterisk (*).