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BISON
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WHAT'S INVOLVED?
The Bison sewage treatment system for single dwellings is a simple
system to install, operate and
maintain while also being versatile, robust and durable.
The system is manufactured in Ireland by E.P.S. Pumping & Treatment
Systems. The company has over
30 years experience in providing and maintaining pumping and treatment
systems in Ireland, the U.K.
and other parts of the World. It is with this experience and continued
involvement in the Industry that
we are providing an advanced, environmentally friendly, cost effective
product for our customers.
HOW DOES IT WORK?
The E.P.S. Bison sewage treatment system uses an extended aeration
process, which incorporates
longer retention times than the conventional activated sludge process
and does not need to be
preceded by primary settlement. This reduces the need for periodic
desludging of any primary
settlement tank.
Sewage flows from the home into the inlet section of the system
where it mixes with the activated
zone within the system. It is here that treatment takes place and
from where the solid matter
settles to the bottom for digestion and breakdown. Power is required
to operate an air blower
which aerates the contents of the tank. With the addition of an
air supply and simple hydraulics,
a continuous recirculation is achieved within the system so as to
ensure continued treatment of the
incoming sewage. At the same time treated effluent migrates upwards
and exits the system at the
outlet weir for disposal to a percolation area.
By its nature, an aerated system does not generate the conditions
that one normally associates
with a septic tank, i.e. obnoxious smells or production of hazardous
gases, etc.
Population Equivalent: 6
Treatment Principle: Extended Aeration
| Final Effluent Standard: |
20mg / L BOD
30mg / L SS
(Prior to Percolation) |
| Outside Diameter |
1.85mtrs |
| Capacity Holding |
2,271L |
| Height from Base to Inlet |
1.69mtrs |
| Capacity Treated |
1,893L |
| Height from Base to Outlet |
1.59mtrs |
| Maximum Organic Load |
360g BOD/day |
| Weight Empty |
120kg |
| Maximum Daily Flow |
1,200L |
| Power Consumption |
86Watt |
* Peak flow must not exceed three times average flow
rate for a period of more than half an hour
in every two hour period.
Installation hints.
Installation of The BisonTM should be carried out as per The BisonTM
Installation manual.
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Use concrete encasement below anti-flotation ring
where applicable.
_________________________________________
Use granular self-compacting material as backfill.
Avoid sharp / large stones in backfill.
_________________________________________
Ensure base is adequately compacted with stone /
sand to avoid subsidence.
_________________________________________
Ensure the system is levelled accurately to enable
continued operation of the system.
_________________________________________
Carry out all excavation, pipe connection, levelling
and backfilling as per Safety, Health & Welfare at Work Act,
1989.
PERCOLATION AREA
Following treatment final effluent is passed through a percolation
area to further treat and polish
the effluent prior to discharge to groundwaters.
This polishing system can be sized by E.P.S. provided the relevant
site/ground type data is supplied.
The system does however need to be installed as per EPA Guidelines.
| Feature |
Recommended
Separation Distance (m)
Bison System Percolation
Area |
| Dwelling served |
7(1) |
5-10 |
| Adjacent dwelling |
7(1) |
5-10 |
| Walls |
3(1) |
3 |
| Roads |
3(1) |
3 |
| Site Boundaries |
3(1) |
3 |
| Drinking Water
Sources |
10 |
10-100(2) |
| Water Course |
10 |
10 |
(1) The depth of the excavation to accommodate the
treatment system must be taken into
consideration when determining this distance as it will be governed
by the invert depth of the
soil pipe where it reaches the treatment system. The separation
distance should be such that
the excavation does not undermine adjacent buildings, roads or walls.
This distance should not
be less than 1.5 times the depth of the excavation.
(2) This separation distance should not be less than 10m except
in the case of very free draining
soils or gravels, where a minimum distance of 40m should be maintained.
The disposal area
should be “down gradient” of any nearby well. Where
it is not possible to locate the disposal
area “down gradient” of any well, including those on
neighbouring properties, an appropriate
separation distance must be maintained ie 100 metres.
MAINTENANCE AND CONTINUAL OPERATION
The Bison system has been designed to minimise the
amount of maintenance required. There are no
internal moving parts to give trouble at any stage after installation.
All of our units come with a 24
month warranty on parts, following the date of commissioning.
For increased efficiency E.P.S. recommend the use of phosphate free
detergents in the household
and grease or fat should not be allowed to enter the plant.
MAINTENANCE CONTRACT
E.P.S. offer full maintenance contracts for all our units which
comprise the following:
- One visit annually to inspect and service the system.
- Repair or replace any equipment as per E.P.S. Bison system warranty
conditions.
- Provision of full service record to customer.
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