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Activated Sludge Bioreactor Plus

MAK Water’s Activated Sludge Bioreactor Plus (ASBR+) type packaged sewage treatment plants are designed to treat domestic strength sewage, to achieve “Class C” treated effluent, plus enhanced nutrient removal, 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 for nitrification and denitrification, 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 analyzers 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+009 ASBR+016 ASBR+022 ASBR+035 ASBR+045
Treatment capacity (min/max) m3/day 3 / 9 5 / 16 7 / 22 12 / 35 15 / 45
*1Balance tank volume (min) m3 15 22 30 50 65
*1Treated effluent tank volume (min) m3 6 11 15 25 32
Sludge tank volume (min for monthly sludge removal) m3 2 3.2 4.5 7 9
Sludge waste volume (min/max) m3/day 0.1 / 0.3 0.2 / 0.6 0.3 / 0.8 0.4 / 1.3 0.6 / 1.7
*2Irrigation pump duty m3/hr @ 350 kPa 1.1 2 2.8 4.4 5.6
Ambient temperature (min/max) °C 1 ~ 35 (1 ~ 43 with optional plant room air-conditioner)
Power supply - AC 380~450 V, 3 Phase, 50/60 Hz
Power consumption Class C (max) kW 6 7 7.5 9.2 10.5
Class A (max) kW 6.5 7.7 9 11.2 13
*2Irrigation pump motor size kW 0.37 0.55 0.75 1.1 1.5
*2Air 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 12 x 3.2
Containerised plant room m N/A (plant room integral to FRP bioreactor) 3 x 2.4


Characteristics Units Influent *3Class C effluent *3Class A effluent
Temperature °C 15~35 -
pH pH units 6.5~8.5 6.5~8.5
Biological oxygen demand (BOD) mg/L *4≤350 <20
Suspended solids (TSS) mg/L *4≤350 <30
Oil & grease mg/L <10 -
Total nitrogen (T-N) mg/L <80 <10 (or 70 mg/L reduction from influent value)
Total phosphorus (T-P) mg/L <16 1~6 (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

*1 Sold Separately, *2 Optional Equipment, *3 Based on QLD Guidelines, *4 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+009 ASBR+016 ASBR+022 ASBR+035 ASBR+045
Automatic inlet screen (2 mm)
Influent mixing pump
Influent feed pump
FRP bioreactor with 
access platform &
Aerobic zones with submersible aerators & MLR pump
Anoxic zone with submersible mixing pump
Clarifier with scum removal system
Chlorine contract zone 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, sucrose & caustic
RAS/WAS pump
Effluent transfer/filter feed pump
Class C Bag filter (100 µm)
Class A Auto-backwashing filter (25 µm) o o o o o
Treated effluent tank recirculation pump   o o o o o
Residual trim 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 ClearAccessTM remote monitoring o o o o o



Instrumentation & Controls Standard Package Premium Package
Balance & chlorine contact tank float level switches -
Chemical dosing & sludge tank float level switches
Pressure switches
Pressure gauges
Magnetic flow transmitters (influent feed pump and MLR pump)
Aerobic tank dissolved oxygen analyser
Aerobic tank pH analyser
Class A only Treated effluent chlorine & pH analyser
Treated effluent turbidity analyser
Variable speed drives Influent feed pump
Submersible aerator 1
MLR pump
Balance & chlorine contact tank level transmitters -
ClearAccessremote monitoring & control capabilities -