Patent ID: 7632408
Filing Date: 2009-12-15
Classification: C02F,Y10S

Abstract:
1. A passive drain field assembly comprising: a first chamber placeable in fluid communication with an effluent source of wastewater at an inlet and comprising: a second chamber having an inlet in fluid communication with the pipe bundle outlet positioned at least partially beneath the first chamber and having a perforated bottom, the second chamber comprising: effluent is channeled into the first chamber inlet, into the distribution pipe, and into the void pipes, wherein the effluent resides, ammonia in the effluent at least partially converted to a nitrate in the presence of oxygen supplied via the vent; effluent rising above the distribution pipe apertures exits via the first chamber outlet to the second chamber inlet; effluent remains in a retention portion of the second chamber upstream of the berm until the effluent reaches a level higher than the berm top, wherein the nitrate is converted to nitrogen gas and is placed in contact with the reactive medium; and effluent flowing over the berm top to a portion of the second chamber downstream of the berm continues to contact the reactive medium and can seep into soil beneath the second chamber through the perforated bottom.