Fluid pump having self-cleaning structure

A method for cleaning an interior area of a pump casing of a pneumatically driven fluid pump configured to remove a liquid from a wellbore in a landfill, the method comprising:

• using a pump cap secured to a first end of the pump casing to receive a pressurized airflow, the pressurized airflow to be admitted into the interior area of the pump casing, the interior area defined by an inner wall of the pump casing, wherein the pump casing is elongated and tubular;
• using a liquid discharge tube to receive the liquid which has been admitted into the pump casing at a second end of the pump casing, the liquid discharge tube in communication with the pump cap and extending at least partially within the interior area of the pump casing toward the second end of the pump casing;
• actuating a valve operably associated with the pump cap to an open state;
• directing the pressurized airflow received at the pump cap through the pump cap and into the interior area of the pump casing with the valve in the open state;
• and
• driving the liquid downward within the interior area and towards the second end of the pump casing and then upwards within the liquid discharge tube by the pressurized airflow, displacement of the liquid forming a swirling, helical flow of the liquid within the interior area of the pump casing such that the liquid moves along the interior area of the pump casing towards the second end of the pump casing and cleans the interior area of the pump casing by liquid scrubbing action within the pump casing to dislodge debris adhered within the interior area of the pump casing and such that the liquid collects the dislodged debris as the liquid swirls downward under pressure from the pressurized airflow and then removes the debris up through the liquid discharge tube and out from the pump casing.

A method for cleaning an interior area of pump casing of a pneumatically driven fluid pump configured to remove a liquid from a wellbore in a landfill, the method comprising:

• receiving pressurized air through a pump cap secured to a first end of the pump casing and into the interior area of the pump casing, wherein the pump casing is elongated;
• receiving the liquid from the wellbore in the landfill into the interior area which had been admitted into the pump casing at a second end of the pump casing;
• actuating a valve operably associated with the pump cap to an open state;
• directing the pressurized air through the pump cap and into the interior area of the pump casing based on the valve being in the open state;
• and
• driving the liquid downward within the interior area and towards the second end of the pump casing and then upwards within the interior area by the pressurized air, the liquid traveling upwards within the pump casing inside of a liquid discharge tube that extends within the pump casing, displacement of the liquid forming a swirling, helical flow of the liquid within the interior area of the pump casing such that the liquid moves along the interior area of the pump casing towards the second end of the pump casing and cleans debris from the interior area of the pump casing within the pump casing such that the liquid collects the dislodged debris as the liquid swirls downward under pressure from the pressurized airflow and then removes the debris up through the liquid discharge tube and out from the pump casing.