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Activated Sludge Bioreactor

MAK Water’s Activated Sludge Bioreactor (ASBR) type packaged sewage treatment plants are designed to treat domestic strength sewage, to achieve “Class C” treated effluent, suitable for reuse in “risk category low” applications or for discharge to environment. With the optional “Class A” upgrade, treated effluent suitable for reuse in “risk category medium” applications is achieved.

The standard treatment process includes influent screening, balance tank mixing, anoxic & aerobic treatment, clarification, effluent sterilization (chlorine tablets) and bag filtration (100 micron). The optional “Class A” upgrade includes an auto-backwashing filter (25 micron), secondary chlorination via tank recirculation and residual trim hypochlorite dosing, and analysers for online monitoring of treated effluent turbidity, free chlorine and pH.

MAK Water’s ASBR Bioreactors are constructed of corrosion resistant FRP, and are self-contained, modular systems for easy deployment to remote locations.

The FRP bioreactor tank fits into a 40’ shipping container. This allows it to travel as general purpose cargo on a conventional container vessel, for cost effective shipping anywhere in the world, as well as providing mechanical protection from damage during shipment.

If you have specific requirements, contact us to discuss our custom designed sewage treatment plants or ask about our hire options.


Treatment capacity (min/max)m3/day7.5 / 2215 / 4521 / 6230 / 9038 / 115
*1Balance tank volume (min)m3255070100125
*1Treated effluent tank volume (min)m31532456380
Sludge tank volume (min for monthly sludge removal)m3912.516.52430
Sludge waste volume (min/max)m3/day0.4 / 1.10.8 / 2.31.0 / 3.11.5 / 4.11.9 / 5.8
*2 Irrigation pump dutym3/hr @ 500 kPa2.85.67.811.314.4
Ambient temperature (min/max)°C1 ~ 35 (1 ~ 43 with optional plant room air-conditioner)
Power supply-AC 380~450 V, 3 Phase, 50/60 Hz
Power consumptionClass C (max)kW5.58.39.91825.9
Class A (max)kW6.79.911.419.427.4
*2Irrigation pump motor sizekW0.751.11.52.23
*2Air conditionerkW1.
FootprintFRP bioreactor & access platformm6 x 3.27.5 x 3.29 x 3.212 x 3.212 x 3.2
Containerised plant roommN/A (plant room integral to FRP bioreactor)3 x 2.4


CharacteristicsUnitsInfluent*3Class C Effluent*3Class A Effluent
*4pHpH units6.5~8.56.5~8.5
*5Biological oxygen demand (BOD)mg/L*6≤350<20
Suspended solids (TSS)mg/L*6≤350<30
Oil & greasemg/L<10-
Total nitrogen (T-N)mg/L<50<40 (or 10 mg/L reduction from influent value)
Total phosphorus (T-P)mg/L<164~12 (variable according to coagulant dose rate)
Total dissolved solids (TDS)mg/L<2,000-
TurbidityNTU-N/A<5 (95%ile)
E.Colicfu/100 mL-<1,000<10
Free chlorinemg/L-0.2~2.0

*1 Sold Separately, *2 Optional Equipment, *3 Based on QLD Guidelines, *4 Caustic dosing may be required where influent alkalinity is inadequate, *5 Sucrose dosing may be required where ratio of BOD to TKN is ≤5, *6 Referenced from Metcalf & Eddy (5th edition, 2014), Typical composition of untreated domestic wastewater; higher/lower design values available on request.


✓= Standard Supply, o = Optional Supply

Automatic inlet screen (2 mm)
Influent mixing pump
Influent feed pump
FRP bioreactor with aluminium access platform & ladderAerobic zone with submersible aerator & MLR pump
Clarifier with scum removal system
Chlorine contact zone with tablet chlorinator
Bioreactor roofing (COLORBOND® steel sheeting)ooooo
Plant room with overhead lighting and GPO for maintenanceChemical dosing – coagulant
RAS/WAS pump
Effluent transfer/filter feed pump
Class CBag filter (100 µm)
Class AAuto-backwashing filter (25 µm)ooooo
Treated effluent tank recirculation pumpooooo
Residual trim hypochlorite dosingooooo
PLC control system with HMI
Plant room air conditionerooooo
Sludge tank with supernatant sampling points and discharge valves
Supernatant sump with submersible pump and level controlooooo
Irrigation pump with level control and mechanical flow totaliserooooo
InstrumentationStandard package
Premium package with ClearAccessremote monitoringooooo


Instrumentation & ControlsStandard PackagePremium Package
Balance & chlorine contact tank float level switches-
Chemical dosing & sludge tank float level switches
Pressure switches
Pressure gauges
Class A onlyTreated effluent chlorine & pH analyser
Treated effluent turbidity analyser
Variable speed drivesInfluent feed pump
MLR pump
Submersible aerator-
Balance & chlorine contact tank level transmitters-
Magnetic flow transmitters (influent feed pump and MLR pump)-
Aerobic tank dissolved oxygen analyser-
Aerobic tank pH analyser-
ClearAccess™ remote monitoring & control capabilities-