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Hitachi in Oceania

Compact Membrane Bioreactor


Hitachi Compact Membrane Bioreactor System is a compact- packaged and adopts membrane filtration process, which requires less space and yet provides higher treatment performance compared with the conventional treatment systems.

By combination of activated sludge treatment with immersed flat membrane modules, this new system can maintain the activated sludge concentration at a high-level in the reaction tank without use of a sedimentation tank for separation of liquids mixed with the activated sludge.  As a result, yield of the treated water is at a higher quality than ever before, as well as space saving and reduced operation costs are realised. Since sludge control in a sedimentation tank is eliminated, this treatment system has a feature of lower maintenance.

Treated water can be used for toilet flushing, irrigation, landscaping, concrete mixing and curing, for cooling water and for industrial water.

Key Features

Membrane Bioreactor Plant Image

Compact Membrane Bioreactor plant

Flow Diagram

"HITACHI Compact Membrane Bioreactor" employs 2 or 3 membrane modules in a vertical formation, with each module containing multiple membrane sheets. Wastewater is effectively treated by simply passing through the flat sheet membranes.

The sewage is separated through suction and filtration, so that the filtrated water directly becomes treated water. Air is supplied from the air diffuser installed on the bottom of the aeration tank to prevent sludge from adhering to the membrane surface. Thus, the system can perform stable treatment without getting clogged.

Compact Membrane Bioreactor flow Diagram

Compact Membrane Bioreactor - membrane module

Benefits to Customers

  • Low costs: standardised Membrane Bioreactor and mass production
  • Variety of configuration: Membrane Bioreactor only / Membrane Bioreactor + RO / RO only
  • Treated water can be used for many purposes
  • Variety of capacity : From 50 m3/day
  • Mobile type
  • Space-saving : compact and reduced footprint because of its short retention time and accumulated structure in a vertical formation.
  • High-quality treated water: as membrane's pore size is 0.1µm, the pathogens, coliforms and helminth egg can be removed. Treated water can be recycled for landscape water and irrigation, etc.
  • Simple operation and low maintenance : simple flat membrane structure prevent twine fibrous Less chemical / membrane element recyclable / remote control screenings in raw water.
  • Less energy consumption : membrane module is set up vertically in multi-stages (maximum 3 stages); blower energy requirements are lowered to clean membrane surfaces.
  • Low operation cost: generated excess sludge is less, therefore disposal cost can be reduced.
  • High reliability: less clogging /smooth surface membrane

Membrane Unit

We can provide various membrane units from 50 m3/day treatment capacity. Our standardised Type is 250 m3/day, 500m3/day, and 750m3/day (Please refer to the following table). They are applicable to larger treatment plants by multiplying standardised Membrane Bioreactor units. 50m3 / day and 100m3 / day units are also available.

    • Capacity in (m3/d)
    • Population Workforce Accomodation
    • Population Residence
    • Electricity Capacity
    • Electricity Consumption (kWh/d)
  • Capacity in (m3/d)
    250
    Population Workforce Accomodation
    1,500
    Population Residence
    1,200
    Electricity Capacity
    13
    Electricity Consumption (kWh/d)
    203
  • Capacity in (m3/d)
    500
    Population Workforce Accomodation
    3,000
    Population Residence
    2,500
    Electricity Capacity
    24
    Electricity Consumption (kWh/d)
    374
  • Capacity in (m3/d)
    750
    Population Workforce Accomodation
    4,000
    Population Residence
    3,800
    Electricity Capacity
    33
    Electricity Consumption (kWh/d)
    540

(Remarks) Above energy consumption figures vary depending on actual operating conditions.


Applications

"HITACHI Compact Membrane Bioreactor" can be utilised for many applications as follows;

  • Construction Workforce Accomodation
  • Small Communites
  • New Residential Areas
  • Resort Hotels / Areas
  • Factory Areas
  • Schools
  • Public Water Treatment Facilities (New Plants/ Plant Renovation)

Features

Features
Membrane Specification Type Submerged flat sheet membrane - strong membrane surfaces which prevents filtration trouble
Material PVDF smooth surface prevents clogging
Pore Size 0.1µm uniform distribution of pore diameter, high particle blocking performance, high water quality
Membrane Area 1m2/ element
Flux 0.8 m3/m2/d higher flux rate : higher treatment capacity
Number of Stage Maximum 3 stages energy & space saving
Biological Treatment Retention Time 6 hours retention time is 1/4 compared with OD process
MLSS 8,000 – 20,000mg/L
Sludge Generated sludge volume is 2/3 compared with OD process
Sludge Treatment Direct sludge dewatering is possible
Space Space is 1/3 less than OD process

Water Quality

The following water quality can be achieved by HITACHI Compact Membrane Bioreactor. compared with conventional OD system.

    • Item
    • Unit
    • Raw Water
    • Treated Water - Our Compact Membrane Bioreactor
    • Treated Water - Conventional OD System
  • Item
    BOD
    Unit
    (mg/L)
    Raw Water
    193
    Our Compact Membrane Bioreactor
    1.0
    Conventional OD System
    20
  • Item
    COD
    Unit
    (mg/L)
    Raw Water
    124
    Our Compact Membrane Bioreactor
    7.5
    Conventional OD System
    25
  • Item
    T-N
    Unit
    (mg/L)
    Raw Water
    38
    Our Compact Membrane Bioreactor
    5.7
    Conventional OD System
    5.7
  • Item
    T-P
    Unit
    (mg/L)
    Raw Water
    7.8
    Our Compact Membrane Bioreactor
    0.3
    Conventional OD System
    0.5
  • Item
    SS
    Unit
    (mg/L)
    Raw Water
    250
    Our Compact Membrane Bioreactor
    <0.4
    Conventional OD System
    20
  • Item
    Coliform
    Unit
    (CFU/mL)
    Raw Water
    3.7×105
    Our Compact Membrane Bioreactor
    Not Detected
    Conventional OD System
    <3000
  • Item
    Escherichia Coli phage (Virus)
    Unit
    (PFU/100mL)
    Raw Water
    3.6×105
    Our Compact Membrane Bioreactor
    1
    Conventional OD System
    2.7×102

(Remarks) The above figures are based on our estimates. Above figures vary depending on actual operating conditions, and water conditions.

picture : Water Quality

Corporate / Office Profile

Corporate / Office Profile
Corporate / Office Name Hitachi Australia Pty Ltd
Address Suite 801, Level 8, 123, Epping Road, North Ryde NSW 2113 Australia
Tel +61 2 9888 4100 or 1800 HITACHI
Fax +61 2 9888 4188