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| Large Plant Details |
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| 1. PROCESS SCOPE |
| The LILLIPUT SEWAGE TREATMENT PLANT MODELS SBC12000 upwards are
designed to treat domestic sewage from a cluster of housing units
through the development spectrum to include townships and cities.
The treated effluent is discharged to garden for irrigation or rivers
and streams or dams and storm water systems. |
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| 2. PROCESS DESCRIPTION |
| The sewage from the septic tanks (pre-digestion) is pumped at a
constant rate to the LILLIPUT BIO-REACTOR. The effluent enters the
bio-reactor below the AWW MARK TWO fixed-growth media where it mixes
with an air diffuser. The effluent then rises through the media where
the microbial population attached to the media removes and aerobically
degrades the organic material contained in the aerated effluent. A
degree of nitrification takes place in the upper layers of the media.
Once it has passed through the media, the treated effluent is pumped
through a disinfecting chlorine contactor and discharged to the garden
for irrigation or rivers and streams or dams and storm water systems.
The range can incorporate all their components into a single unit
such as containerised applications or in modular form to suit topographical
and/or aesthetic requirements. In rural areas, to do away with the
need for electrical power, modular components can be arranged to promote
the use of gravity. Trickling introduction of effluent, with natural
up-drafts and a residency of only five (5) minutes is achieved. The
disposal of the treated effluent by irrigation is totally safe and
helps to conserve water. Domestically, such savings are in the order
of 40%. |
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| 3. INFLUENT CHARACTERISTICS |
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| PARAMETER |
UNIT |
TYPICALVALUE |
| POPULATION |
Pe |
10 |
| FLOW (ADWF) |
l/d |
2000 |
| OA |
mg/l |
80 |
| COD |
mg/l |
800 |
| NH3 |
mg/l |
40 |
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| 4. PHYSICAL COMPONENTS - TECHNICAL DETAILS |
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| 4.1. Up-flow Submerged Reactor: |
This aerobic biological treatment unit is based on the Submerged
Fixed Film principle. The plant utilises random-packed AWW MARK
TWO biofilter media which has a high surface to volume ratio
to permit a high biomass-density.
The LILLIPUT range can be located discreetly above ground to
reduce costs of installation. |
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| NUMBER |
One or in series modules
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| MATERIAL OF CONSTRUCTION |
LLDPE |
| DIAMETER |
1,1 To 2,6 m |
| TOTAL REACTOR VOLUME |
1 To 15 kl |
| FILTER MEDIA |
AWW MARK TWO |
| SPECIFIC SURFACE AREA |
200 m2/m3 |
| COD LOAD |
1 kg/d |
| BLOWER TYPE |
Diaphragm/Rotary vain |
| SLUDGE PRODUCTION |
0.3 kgDS/kgCOD |
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| 4.2. Disinfection |
| Disinfection is achieved by in-line chlorination or Ozonation
of the treated effluent. |
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| NUMBER |
1 |
| CHLORINE SOURCE |
CaHOCl |
| FLOW RATE |
300 l/h |
| HRT (ADWF) |
0,5 h |
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| 4.3 Bio-enhancement option |
The introduction of the Alpha Biotech bio-enhancing catalyst
material.
The incorporation of the biocatalyst enhances the rates and
degree of biodegradation of solids in the septic tank thereby
extending the intervals between desludging. It also reduces
the negative impact of kitchen wastes of which, cooking oil
is the worst culprit.
The Alpha Biotech catalyst has been successfully applied to
sewage treatment. Sludge production is reduced, COD removal
in the septic tank is enhanced and plant performance is generally
enhanced, particularly in periods of abnormal load peaking.
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| 5. SITE REQUIREMENTS |
The only requirement for the installation of all models is a 220
volt power supply and in some cases a surface bed.
The treatment plant is easily installed with simple plumbing requirements.
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| 6. OPERATION AND MAINTENANCE |
The plant does not require continuous supervision and minimal maintenance.
All pumps are sealed units rated for continuous use. The chlorine
disinfection unit should be topped up intermittently to ensure optimum
efficiency.
All mechanical / electrical components are readily available off the
shelf from local shops.
All plant and equipment is supplied in non-corrosive or corrosive
protected material. As the entire plant can be constructed above ground,
the necessity for extensive earth works and civil requirements is
curtailed. |
