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Membrane Bioreactor (OAMBR)

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Membrane Bioreactor (OAMBR)

 

Membrane Bioreactor (OAMBR)

Operating Since:               January 2014

Process Description

The OAMBR unit consists of an aerobic bioreactor combined with a separated ultra-filtration system. The system re-circulates the biological liquids over the bioreactor and filters the treated effluent (permeate) before it is discharged. In addition to this, due to the nature of the membrane material, it retains dissolved solids with a high molecular weight. This kind of pollution normally passes through conventional filters and thickeners. With the OAMBRfiltration unit the above-mentioned dissolved solids remain within the reactor where further biological degradation can occur, the latter is achieved by the inherent long sludge retention time.

The OAMBRmodules consist of a bundle of reinforced hollow fiber membranes. Flow along the membrane surface is created by coarse bubble aeration at the bottom of the membranes. A negative pressure inside the hollow fibers is created by the suction of the permeate extraction pump (rotary lobe pump). The treated water (permeate) passes through the membrane whereas all particles > 0.03 micron including microorganisms are rejected. Therefore the sludge (biomass) can be concentrated easily to max resulting in a low bioreactor volume and extremely good effluent quality. The membrane filtration unit consists of:

  • 2 biology tanks with an aeration system
  • 2 biology tank aeration blowers
  • 2 filtration tanks, each with:
    • 2 OAMBR cassettes (space for a third)
    • 2 recirculation pumps (duty/standby)
  • Permeate pump skid with 3 reversible pumps

(duty/duty/standby), piping

  • 2 membrane tank aeration blowers
  • 2 permeate tanks
  • Chemical dosing unit for cleaning, neutralizing and disinfection processes.
  • Piping and measures

The filtration tanks will be fed with mixed liquor from biology tank by gravity.  Biomass recycle flow goes back to the bioreactor by the Recirculation pumps. Permeate from the OAMBR filtration system will be discharged continuously by the permeate pumps to the permeate tank from where it will be pumped to the ozone system. For periodical backpulse purposes permeate in these tanks will be used to flush the membranes.

The pumps for permeate extraction/backpulse are installed in the process building on a prefabricated steel framework, flow meter, pressure measurements, drains and vents, internal pipe work, etc.

Based on the design criteria, the filtration plant was designed to meet the requirements with two filtration units, each equipped with 2 OAMBR 500C cassette and spare space for a third cassette.

 

Feed Design Characteristics

Flow

 

COD

 

BOD5

 

TSS

 

VSS/TSS

 

TKN

 

NH4

 

TP

 

Alkalinity

 

Ave.

Max. Ave.

Max. Ave.

Max. Ave.

Max. Ave.

Max. Ave.

Max. Ave.

Max. Ave.

Max. Ave.

Max.

550 m3/dy

700 m3/dy

389 mg/L

789 mg/L

166 mg/L

369 mg/L

237 mg/L

480 mg/L

85 %

85%

18.9 mg/L

31.2 mg/L 8.6 mg/L

17.4 mg/L 6.1 mg/L

11 mg/L

158 mg/L as CaCO3

258 mg/L as CaCO3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Membrane Design Characteristics

  • Two trains of two cassettes of 22 OAMBR-500c

(250 ft2 modules)

 

  • Flux @ ADF = 11.2 LMH
  • Flux @ MDF = 14.2 LMH

Flux @ ADF (N-1) = 22.4 LMH

Membrane-Bioreactor

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Permeate/Backpulse Tanks with permeate skid on left hand side and ozone feed skid on right hand side.

Sulphuric Acid and Citric Acid Dosing Skids

Looking down on top of Z500C Cassettes

Dosing valves (outside)

Membrane Tanks

Looking down on process pipe work (air scour and permeate lines)

Looking down on top of Z500C Cassettes

On top of membrane tanks

Process blowers for biology and membrane air scour

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