Large Plant Details

Overview of Lilliput Sewage Treatment Large Plant

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.                 

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%.

3. INFLUENT CHARACTERISTICS

                                       

PARAMETER
UNIT
TYPICALVALUE
POPULATION
Pe
10
FLOW (ADWF)
l/d
2000
OA
mg/l
80
COD
mg/l
800
NH3
mg/l
40
           

           

4. PHYSICAL COMPONENTS - TECHNICAL DETAILS            

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.

NUMBER One or in series modules
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

4.2. Disinfection

Disinfection is achieved by in-line chlorination or Ozonation of the treated effluent.

NUMBER 1
CHLORINE SOURCE CaHOCl
FLOW RATE 300 l/h
HRT (ADWF) 0,5 h

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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