Technical
data
| Model |
DMS1 |
DMS2 |
DMS3 |
DMS4 |
DMS5 |
Population
range
persons)* |
1-3 |
1-6 |
5-11 |
10-15 |
14-20 |
| Tank
size |
A |
A |
B |
C |
C |
Maximum
organic loading
BOD5/day (grams) |
180 |
360 |
660 |
900 |
1200 |
Maximum
average daily
flow (litres) ** |
600 |
1200 |
2200 |
3000 |
4000 |
Blower
power
consumption (kW h)*** |
0.06 |
0.07 |
0.118 |
0.144 |
0.215 |
|
*
A WPL “Loading Guide” providing further information
for non-domestic applications is available.
** Peak flow must not exceed 3 x total flow for no more than
1/2 an hour in any 2-hour period.
*** Compressor manufacturer’s data is an approximation
to plant conditions. |
Blower
installation
The blower is supplied with a housing to protect it in an outdoor
environment and should be
connected to a single-phase supply (230v) via a suitable IP55 rated
weatherproof socket or fused spur (not supplied) by a competent
electrician. The blower housing can be disregarded if installing
the blower in a garage or outhouse environment. Included are 10m
of airline to connect between the blower and the tank. Blower installations
of up to 30m from the tank can be accommodated. Please contact WPL
or your authorised distributor for advice.
Process performance
The Diamond process is designed to perform to the 20:30mg/l BOD:SS
Royal Commission standard on a 95 percentile basis. A data sheet
explaining the standard in more detail is available from WPL. Process
performance is subject to strict adherence to WPL’s installation,
operation and maintenance manuals, user guides and a start up period,
depending on plant loadings and water temperature, over a 6-12 week
period. WPL also provides a data sheet that explains how to calculate
whether the area you wish to discharge to is suitable for the construction
of a soakaway.
System
components & materials
Tank – Glass reinforced plastic (GRP), polypropylene,
Blower – Double diaphragm, linear motored.
How
the Diamond works
| The
Diamond system consists of two treatment
chambers within a single tank. |
| •
The centre aeration chamber (1) is a circular
tank with a sloped open base, which empties into the bottom
of the outer clarifier chamber (2).
• Located in the centre of the aeration chamber is
a 200mm diameter draft tube (3), which extends to 100mm
from the bottom of the clarifier. Air is released at the
bottom of the draft
tube through a disc plate diffuser (4).
• As the diffused air rises in the draft tube, it
causes an upward flow of process fluid. This draws the settled
solids (5) from the bottom of the clarifier up through the
draft tube where they are discharged at the surface of the
aeration chamber.
• The design of the draft tube ensures continuous
and complete mixing of oxygen with the sewage. This allows
for the growth
of various aerobic organisms that biologically degrade the
wastewater contaminants. |
•
Gravity causes the aerated solids to settle at the bottom
of the tank where they are again drawn back up through the
draft tube.
• As raw sewage enters the aeration chamber, it displaces
biological solids from the aeration compartment to the clarifier.
Quiescent conditions in the clarifier allow the digested
solids to settle to its base where they are returned back
to the aeration compartment.
• The clarified (treated) effluent flows slowly up
through the clarifier and over a weir (6), which extends
around the periphery of the tank.
• The effluent collects in an outer trough where it
is discharged through a 110mm-pipe connection. The scum
baffle (7) located
inside the overflow weir prevents floating solids (8) from
passing over the weir. |
|
British Standards and Building Regulations
|
Part
H of the Building Regulations came into force on April 1st
2002. This standard indicates that “package treatment
systems should be type tested in accordance with BS EN 12566-3
(undated) or otherwise tested by an approved body”.
BS EN 12566-3 (undated) supersedes BS 7781.
WPL is currently unable to find an accredited body to test
to either standard. While UK testing is unavailable, WPL will
continue to promote the Diamond range citing the American
National Standards Institute (ANSI) |
|
testing
carried out by NSF International as an otherwise approved
body. The ANSI/NSF Standard 40 has a similar testing regime
to BS 7781. ANSI is recognised by the British Standards
Institute and NSF International is associated with our Water
Research Council (WRC). All of these companies have comprehensive
web sites.
Copies of the most recent ANSI/NSF Standard 40 report and
a sample CE
certificate are available from WPL on request.
|
|
