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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, aerobic treatment, clarification and effluent disinfection (chlorine tablets). The optional “Class A” upgrade includes an auto-backwashing media filter, disinfection via tank recirculation and hypochlorite dosing, and analysers for online monitoring of treated effluent turbidity, free chlorine and pH.

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

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


Parameter Units ASBR-025 ASBR-035 ASBR-050 ASBR-070 ASBR-100
Treatment capacity m3/day 25 35 50 70 100
*1Balance tank volume (recommended) m3 25 35 50 70 100
*1Treated effluent tank volume (*2minimum) m3 4.0 5.5 8.0 11 16
Sludge tank volume m3 5.3 5.3 10.5 10.5 23
Thickened Sludge waste volume  m3/day 0.3 0.4 0.5 0.8 1.2
*3 Irrigation pump duty m3/hr @ 350 kPa 2.1 2.9 4.2 5.8 8.3
Ambient temperature (min/max) °C 1 ~ 35 (1 ~ 43 with optional plant room air-conditioner)
Power supply - AC 415 V, 3 Phase, 50 Hz
Power consumption Class C (max) kW 9 12 15 20 28
Class A (max) kW 16 19 22 27 35
*3Irrigation pump motor size kW 0.55 0.75 1.1 1.5 2.2
*3Air conditioner kW 1.5 1.5 1.5 1.5 1.5
Footprint FRP bioreactor & access platform m 6 x 3.2 7.5 x 3.2 9 x 3.2 12 x 3.2 10 x 3.8
Sludge tank Øm 1.8 1.8 2.45 2.45 3.83


Characteristics Units Influent *4Class C Effluent *4Class A Effluent
Temperature °C 15~35 -
pH pH units 6.5~8.5 6.5~8.5
Biological oxygen demand (BOD) mg/L *5≤350 <20
Suspended solids (TSS) mg/L *5≤350 <30
Oil & grease mg/L <10 -
Total nitrogen (T-N) mg/L ≥20 N/A (no reduction)
Total phosphorus (T-P) mg/L <16 4~12 (variable according to coagulant dose rate)
Total dissolved solids (TDS) mg/L <2,000 -
Turbidity NTU - N/A <5 (95%ile)
E.Coli cfu/100 mL - <1,000 <10
Free chlorine mg/L - 0.2~2.0

*1 Sold Separately, *2 For 15 contact time, *3 Optional Equipment, *4 Based on QLD Guidelines, *5 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

Equipment ASBR-025 ASBR-035 ASBR-050 ASBR-070 ASBR-100
Automatic inlet screen (2 mm)
Influent mixing pump
Influent feed pump
FRP bioreactor with aluminium access platform & ladder Aerobic zone with submersible aerator 
Clarifier with scum removal system
Buffer zone/tank with tablet chlorinator
Bioreactor roofing (COLORBOND® steel sheeting) o o o o o
Plant room with overhead lighting and GPO for maintenance Chemical dosing – coagulant
RAS/WAS pump
Effluent transfer/filter feed pump
Class A Auto-backwashing media filter  o o o o o
Treated effluent tank recirculation pump o o o o o
Hypochlorite dosing o o o o o
PLC control system with HMI
Plant room air conditioner o o o o o
Sludge tank with supernatant sampling points and discharge valves
Supernatant sump with submersible pump and level control o o o o o
Irrigation pump with level control and mechanical flow totaliser o o o o o
Instrumentation Standard package
Premium package with ClearAccessremote monitoring o o o o o


Instrumentation & Controls Standard Package Premium Package
Level switches Balance tank -
Sludge tank
Chemical dosing tank(s)
Supernatant sump (optional)
Level transmitters Balance tank -
Buffer tank
Treated effluent tank
Flow switches Effluent transfer pump (Class C) -
Treated effluent recirculation pump (Class A) -
Irrigation pump (optional) -
Pressure switches Balance tank mixing pump
Pressure indicators Balance tank mixing pump
Influent feed pump
RAS/WAS pump
Effluent transfer pump (Class C)
Media filter feed pump (Class A) -
Media filter discharge (Class A) -
Irrigation pump (optional)
Treated effluent recirculation pump (Class A)
Pressure transmitter Media filter feed pump (Class A) -
Media filter discharge (Class A) -
Mechanical flow totaliser Irrigation pump (optional)
Free chlorine and pH analyser (Class A) 
Turbidity analyser (Class A) 
ClearAccessTM remote monitoring & control capabilities -