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filter to the disposal system. Approximately once per week
(field adjustable), the system field flush valve opens to flush
the disposal system of any solids that have built up. Sequential
flushing is done for each zone during subsequent pump cycles.
The flush water along with any impurities removed by the filter is
returned to the wastewater treatment plant for further treatment.
The control panel is furnished with a Hand-Off-Auto switch
located in the panel. The hand mode overrides the PLC timer so
the pump can be manually turned on. When the level of water
in the dosing tank is low, the pump float switch will be in the off
position, disabling the pump. The control panel also contains a
high level alarm that will sound if a high level is reached in the
dose tank which may indicate a system malfunction.
The filtered effluent is pumped through the supply line to flexible
polyethylene tubing with large turbulent flow labyrinth or pressure
compensating emitters uniformly spaced along the line. Effluent
is uniformly distributed over the entire absorption field using a low
flow rate.
Absorption field size is determined by, soil type, site
characteristics and daily wastewater flow. The field size varies
depending on soil texture and permeability. The absorption field
should be situated on the best soil and landscape position of the
site. Separation between the bottom of the emitter pipe and any
underlying restrictive horizons (seasonably high water table) can
be as little as 6 inches or as regulations require. The emitter lines
should be installed between 6 and 18 inches deep depending on
soil and site characteristics.
An absorption field installed on slopes should be carefully
designed to take into consideration elevation changes and emitter
line placement due to gravitational pressures. The treatment plant,
dosing tank and filter unit should not be placed in low areas in
order to prevent subsurface or surface runoff from returning or
flooding the units.
8115-1/2 HP
Drip Tubing
Geoflow
Classic
®
Geoflow
PC .53
®
Geoflow
PC 1.01
®
Netafim Bio-Line PC .61
8230-1 HP
Drip Tubing
Geoflow
®
Classic
Geoflow
®
PC .53
Geoflow
®
PC 1.01
Netafim Bio-Line PC .61
Note: Each system is designed to be hydraulically balanced with a maximum 300 feet of supply line between the pump and the inlet to the drip field with a maximum elevation difference of 30 feet.
Consult Delta Treatment Systems for alternate designs.
Pre-Engineered Subsurface Drip Disposal
Systems by Delta Treatment Systems
Drip Tube
Laterals
per Zone
per Zone
630
3
1,320
6
750
3
1,200
3
Drip Tube
Laterals
per Zone
per Zone
1,500
7
2,400
8
1,750
6
2.100
7
Once the soil and site evaluation has been completed, the most
suitable location and size of the absorption field is selected.
Depending on the hydraulic loading rate of the soil, the linear feet
of emitter pipe and number of zones are determined. It is also
important that each zone is placed along the ground contour. The
configuration of the zones may vary in shape.
The PLC controller must be set in the field as system flow and the
number of zones will vary from site to site. The pump run time is
factory set, but can be changed in the field.
The number of pump cycles is factory set at 12 per day (field
adjustable).
Example Using Geoflow
System flow – 600 gallons per day (GPD)
Total length of emitter pipe – 1260 feet
Number of zones - 2 at 630 feet each
Number of pump cycles – 12 (factory set)
Zone capacity – 6.4 gallons per minute (GPM)
Number of gallons pumped per pump cycle =
600 GPD
12 pump cycles per day
Run Time = 50 gallons per pump cycle = 7.81 minutes
Using a safety factor of 1.5, set time at 1.5 x 7.81 = 12 min.
TABLE 1
Length
Max. Number of
per Lateral
Zones per System
210
220
250
400
Length
Max. Number of
per Lateral
Zones per System
215
300
250
300
4
Classic Tubing:
®
= 50 gallons per pump cycle
6.4 GPM
Pressure
Regulator
6
20 PSI
6
20 PSI
6
20 PSI
6
20 PSI
Pressure
Regulator
6
20 PSI
6
40
6
40 PSI
6
40 PSI
Zone Discharge
in GPM
6.4
5.8
6.3
6
Zone Discharge
in GPM
15.3
10.6
14.6
10.7
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