초록 ▼

An apparatus and method for treating wastewater is provided including a cylindrical tank having a top, a bottom, an outer wall and a cylindrical inner wall. The inner wall extends from the bottom of the tank to a point above a desired water level. The inner wall, the top and the bottom define an inn

An apparatus and method for treating wastewater is provided including a cylindrical tank having a top, a bottom, an outer wall and a cylindrical inner wall. The inner wall extends from the bottom of the tank to a point above a desired water level. The inner wall, the top and the bottom define an inner aerobic zone. The inner wall, the outer wall, the top and the bottom define an outer anaerobic zone. Wastewater may pass from the outer anaerobic zone to the inner aerobic zone through holes in the inner wall. An open ended conical hopper is positioned within the inner aerobic zone with its smaller end pointed toward the bottom of the tank. Several radially spaced air outlet pipes connected to a compressed air source extend downward into the inner aerobic zone where air is discharged through the open ends of the outlet pipes. An inlet line connected to the tank opens into the outer anaerobic zone of the tank. An outlet line is positioned within the clarification zone to remove purified water from the tank. Wastewater is treated by anaerobic bacteria in the outer anaerobic zone and by aerobic bacteria in the inner aerobic zone. Aerobic bacteria, forced through holes in the inner wall by aeration occurring in the inner aerobic zone, denitrify the wastewater as they are starved of oxygen in the outer anaerobic zone. Finally, suspended solids settle out of solution in the clarification zone prior to the purified water leaving the tank.

대표청구항 ▼

[ I claim:] [1.] An apparatus for treating wastewater for use with a compressed air source comprising:a tank having an upper portion, a lower portion, a bottom, an outer wall and an inner wall, said inner wall extending from said lower portion into said upper portion above a desired water level, sai

[ I claim:] [1.] An apparatus for treating wastewater for use with a compressed air source comprising:a tank having an upper portion, a lower portion, a bottom, an outer wall and an inner wall, said inner wall extending from said lower portion into said upper portion above a desired water level, said inner wall, and said bottom defining an inner aerobic zone, said inner wall, said outer wall, and said bottom defining an outer anaerobic zone fluidly connected to said inner aerobic zone;a hopper positioned within said inner aerobic zone, said hopper having sides defining a clarification zone, said hopper also having an upper opening located in said upper portion above said desired water level, and a lower opening located in said lower portion below said desired water level;at least one air outlet pipe configured to fluidly connect to said compressed air source, said air outlet pipe extending into said inner aerobic zone between said sides of said hopper and said inner wall, said air outlet pipe containing an aperture, through which air may be discharged into said inner aerobic zone;an inlet line opening into said outer anaerobic zone of said tank; andan outlet line having an intake end positioned within said clarification zone and an outlet end positioned external to said tank.