6
Plant Installation Instructions
Installation of the Treatment Tank (see tank drawing in appendix)
Review permit / design conditions accordingly, and decide on an appropriate location for the tank(s)
which is accessible to the home sewer outlet. Excavate a site which is approximately 1’ larger than the
tanks at a depth that will allow proper coverage of the system. The building sewer outlet will determine
the minimum depth of the plant. Make sure you have a smooth level surface for the base of the unit.
The tank must be placed on stone-free undisturbed soil or fill sand / pea gravel over stony soil (stones
greater than 1/2 “diameter). Place the treatment tank into the excavated site and double check for level.
Carefully backfill around the unit, gently compacting the soil as well as possible, and leaving the inlet
and outlet holes open for connections. Connect the influent end to the building sewer outlet. Connect
the appropriate discharge to the effluent end of the plant. Only 4” schedule 40 pipes or equivalent per
code should enter and exit the unit until undisturbed soil is reached. Inlet and outlet pipes should extend
at least 3” into the system, with a baffle on inlet as well as (double-tee) baffle assembly on outlet.
Carefully install treatment unit components (next section), then install electrical components in
accordance with local electrical codes. Fill the unit to the level of the effluent discharge. One by one,
turn on each electrical component and verify that there are no leaks, air or water, throughout the system.
If a leak is detected, repair and retest. After all required health department or electrical inspections are
fulfilled, carefully backfill the excavated site. The first 4” of backfill around and on top of the tank is to
be the same as the backfill under the tank. Visually inspect all above ground connections, and double
check riser perforations for sign of misplaced boot seals, etc. Connect the clarifier tee to the effluent
pipe inside the unit making sure it is in the level vertical position. Install riser vent or vented lid at the
digester access riser, or as an alternative, vent at clarifier access if tank is properly constructed with free-
moving air between digester & clarifier.
Installation of Components (see assembly drawing in appendix)
Read the equipment parts list provided in the owner’s manual and verify that all required parts are on
site. Before the system package is installed inside of the unit, each component should be carefully
inspected for damage or defects. Never install damaged components inside of the treatment system.
The dual port linear blower should be no more than 50’ away from the plant and in a well ventilated
area. The precaster will typically install a tank adapter ring onto the lid of the tank, which works well if
there is 12” or more of riser height available to accommodate the blower. If the tank is shallower,
blower can be installed at remote location (either in separate ventilated basin or crawlspace, etc.).
Air line to diffusers should be made with 1” PVC schedule 40 pipe. Make sure the pipe is stable and
resting on the excavated surface as opposed to hanging. All PVC glue fittings should be connected
using approved PVC primer and cement. Use provided adapter fittings to adapt from blower to 1” PVC,
as outlined in assembly drawing. A hole saw will be necessary to tap through the riser(s), and rubber
grommets (recommend pull thru Polylok grommets) will be necessary to keep riser perforations
watertight. As per the assembly diagram, the diffuser manifold assembly will hold the diffusers off the
bottom of the tank approximately 4 inches. The screw-in diffusers are placed parallel to and
approximately 4” away from the inter-compartmental wall. Verify that the clarifier tee assembly is
vertical and level for correct operation. The second aerator port marked “skimmer” will adapt to ½”
Schedule 40 PVC as per the assembly diagram. This line feeds the airlift for the sludge recirculation.
The 1” PVC recirculation inlet is installed vertically in the inlet of the clarifier, 4” from the angled
hopper floor as measured from the lowest measurable point. Tie the ½” skimmer airline into the 1” x ½”
tee exactly 8 inches above the recirculation inlet. The recirculation line then runs vertically up to a point
as shown on the tank diagram above the liquid level, and then runs horizontally back across the digester
to the pretreatment tank. Upon entering the pretreatment tank, immediately adapt up to 2” Schedule 40
PVC with the provided adaptor (this is necessary to avoid splashing at the return inlet). Then run the 2”
PVC back to a point visible from the access riser above and into the 2” San-Tee provided. Extend the 2”
PVC down into the pretreatment tank as shown on the tank diagram. The Aerator and alarm control
panel should be installed in areas where their function will not be hindered.
Summary of Contents for BNR 500 GPD
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