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| We
are able to design, manufacture & install a true packaged "aerated
activated sludge system". The complete plant is factory pre-assembled
before transport to site. The system employs well proven technology
similar in operating principles to any large sewage treatment plant
used for municipal sewage. |
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| The
unit comprises a steel welded tank suitably stiffened and shotblasted
and epoxy coated for corrosion protection. The tank is divided by
means of partition walls into separate aeration and settlement compartments.
The aeration equipment consists of two blowers with galvanized pipework
and nozzles. The diffusers are designed to ensure uniform bubble distribution
of air over the entire width of the aeration tank to meet the requirements
of the sewage load. |
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| DESCRIPTION
OF SYSTEM |
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| Raw sewage from
the housing units would discharge into a three chamber concrete septic
tank with twenty four hour minimum retention time. The purpose of
the septic tank is threefold: |
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| 1) To trap fat,
rags & paper. |
| 2) The reduce
the organic loading by removal of faecal solids by 30%. |
| 3) To provide
some degree of flow balancing. |
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| Septic tank effluent
will flow by gravity into our AEROGEST system which consists of a
single tank for up to 270 people and a double unit for populations
above that. The package plant includes a steel tank for incorporating
an aeration reactor and clarifier settlement tank - in two separate
sections. |
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| The reactor operates
on the extended aeration diffused air activated sludge principle in
which a culture of micro organisms (activated sludge) are continuously
mixed and aerated with septic tank effluent. Air is provided via two
duty/standby generously rated blowers. The air is introduced into
the mixture of sludge and sewage (mixed liquor) from a series of down
pipes at one end of the tank and then through WYATT diffusers which
provides highly efficient oxygen transfer from air to liquid. There
would be a retention time of approximately twenty two hours based
on the average daily flow through the system. |
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| The system is
designed to consistently meet the Water Act Standards. In particular
an ammonia content of <3mg/l and faecal coliforms of <100 counts/100ml
and all the recently prescribed Metro requirements. The system comes
with all the necessary internal pipework, walkways and a separate
weatherproof electrical control panel. |
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| The plant is
guaranteed to meet the Water Act and Metro requirements provided that
the design load is not exceeded and a maintenance \ operating contract
is implemented. We can provide this service. |
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| AEROGEST
SEWAGE TREATMENT PLANT |
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| Introduction |
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- The
Aerogest is a complete self-contained sewage treatment
system designed to treat new sewage or grey water
from a septic tank to S.A. General Standard/General
Limit, which is suitable for disposal to stream or
irrigation.
- The
system employs the extended aeration activated sludge
principal using diffused aeration and blowers. Activated
sludge is the preferred treatment process for all
medium to large municipal systems worldwide.
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- The Aerogest
is completely fabricated and built in the factory from epoxy coated/galvanized
mild steel components to best workshop practice. It is shipped
to site by low loader and off-loaded onto suitable above or below
ground foundation. If all inlet and outlet and power connections
are ready, the system can be operational within 48 hours.
- Once setup,
the plant is stable and can operate unattended except for 10 minute
daily checks. It is strongly recommended that process operation
in monitored regularly - preferably twice a month - to maintain
optimum performance.
|
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| FEATURES |
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- Can
treat either raw sewage or grey water from septic
tank
- Extended
aeration principle ensures stable waste sludge which
can be dewatered on simple drying beds or recycled
back to septic tank if one is installed. Alternatively,
waste sludge can also be removed approx. every 6/12
months by vaccum tanker.
- No
odour or foaming problems or fly nuisance. very low
noise, splashing and aerosol formation.
- Reliability
- 100% duty and 100% standby blowers with auto restart.
- Highly
efficient Wyatt PTFE sintered diffusers which are
easily removed and cleaned whilst the rest of the
system operates.
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- Direct and
easy access to all operating components for cleaning and process
monitoring.
- Can be started
up immediately by import of good quality activated sludge from
an existing plant or naturally within 2-4 weeks.
- Full operational
flexibility for cyclical low/high loads by separate timer sequence
control of air blowers.
- Can be installed
above or below ground. Visually unobtrusive if installed below
ground.
- Rapid installation
within 48 hours if all services are prepared (reticulation in
/ out, civil works, electrical power)
- Long life
+ 20 years for mild steel. Indefinite for 304 S.S
- May be installed
in a suitable building or outside without special precaution.
|
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| SPECIFICATION |
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| Tankage |
5mm
mild steel plate with reinforced sections |
| Exposed
Pipework |
Galvanized
flanged / screwed fittings |
| Walkways |
Galvanized
mild steel expanded Mentis grating |
| Corrosion
Protection |
All
components except galvanized are shot blasted and painted 2
coats Copon. Colour emerald green or blue. |
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| Air
Blowers |
100%
duty and 100% standby blowers are Mapro side channel type or
equal fitted with air relief valve and inlet silencer or filter. |
| Diffusers |
Sintered
PTFE Wyatt high efficiency diffusers |
| Chlorination |
Sodium
hypochlorite dosing tank and metering pump controlled by dose
adjustment and timer |
| Electrical |
Weatherproof
panel with hand/off/auto selectors with ammeters, hour meters
and 96 x 15 min nib timers 380 volt direct on-line motor starters
with auto restart on auto selection in the event of power failure |
| Air
Control |
Fully
adjustable individual timers for both duty / standby blowers.
Individual air control valve for each diffuser set. |
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| Sludge
Pump |
Adjustable
rate sludge return from clarifier to aeration tank and for wasting
to septic tank or drying beds by simple air lift pump operated
by duty air blower. |
| Eductors |
Hydraulic
surface skimming eductors (either 2 or 4). Remote floating debris
on the clarifier surface back to the aeration tank simply and
effectively. |
|
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| INSTALLATION |
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- Units are
shipped to site complete on low loader for offloading onto previously
prepared concrete foundations - above or below ground to occupy
a minimum ground area.
- Provided
inlet / outlet reticulation and electrical power is available,
units can be up and running within 48 hours from delivery to site.
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| OPERATION
/ MONITORING / MAINTENANCE |
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- All standard
quotations include commissioning and one additional monitoring
visit by process chemist.
- Comprehensive
operating and maintenance instructions are provided on commissioning
/ hand over.
- Long term
contracts are available for operating, performance monitoring
and maintenance as extras to basic cost.
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| EXAMPLES
OF PLANT SELECTION (with septic tanks) These
are typical and MUST be confirmed for final selection. |
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