Pressurized Subsurface Drip Irrigation for Domestic
Wastewater Treatment
What is the purpose of pressurized subsurface absorption To treat wastewater through irrigation below the land's surface without direct
fields utilizing emitters? discharge to the surface.
How do organic constituents in wastewater interact with They are consumed or stabilized by soil bacteria, with nitrogen being nitrified,
soil bacteria in subsurface systems? denitrified, or taken up by plants.
What is the maximum concentration of biological oxygen 25 milligrams per liter (mg/l).
demand (BOD5) allowed in aerobic pretreatment?
What is the maximum concentration of total suspended 30 milligrams per liter (mg/l).
solids (TSS) allowed in aerobic pretreatment?
What must be included in the design of dosing tanks for An audible and visible alarm for high water levels or power loss, and a minimum
subsurface absorption fields? capacity equal to the 24-hour waste flow.
What is the purpose of time dosing in subsurface To ensure the total 24-hour wastewater effluent flow is applied within a 24-hour
absorption fields? period.
What is the acceptable variation in flow between No more than a 10 percent variation.
individual emitters in a subsurface absorption field?
What is required for the filtration system in drip irrigation It must be automatically self-cleaning and return filter residue and backwash to
systems? the treatment unit.
What is the minimum depth for installing emitter lines in 8 to 12 inches from the original undisturbed ground surface.
the root zone of cover vegetation?
Wastewater Treatment
What is the purpose of pressurized subsurface absorption To treat wastewater through irrigation below the land's surface without direct
fields utilizing emitters? discharge to the surface.
How do organic constituents in wastewater interact with They are consumed or stabilized by soil bacteria, with nitrogen being nitrified,
soil bacteria in subsurface systems? denitrified, or taken up by plants.
What is the maximum concentration of biological oxygen 25 milligrams per liter (mg/l).
demand (BOD5) allowed in aerobic pretreatment?
What is the maximum concentration of total suspended 30 milligrams per liter (mg/l).
solids (TSS) allowed in aerobic pretreatment?
What must be included in the design of dosing tanks for An audible and visible alarm for high water levels or power loss, and a minimum
subsurface absorption fields? capacity equal to the 24-hour waste flow.
What is the purpose of time dosing in subsurface To ensure the total 24-hour wastewater effluent flow is applied within a 24-hour
absorption fields? period.
What is the acceptable variation in flow between No more than a 10 percent variation.
individual emitters in a subsurface absorption field?
What is required for the filtration system in drip irrigation It must be automatically self-cleaning and return filter residue and backwash to
systems? the treatment unit.
What is the minimum depth for installing emitter lines in 8 to 12 inches from the original undisturbed ground surface.
the root zone of cover vegetation?
