Bio-Disk® Comparison to Other Technologies

 Comparison of Bio-Disk® and conventional activated sludge.


Conventional activated sludge


Bio-Disk®  system

Constant observation and tuning of treatment process Simplicity in operation and maintenance
Monitoring by instruments and chemical analysis atdifferent stages Monitoring by visual inspection of disc surface
Many pumps and other sensitive equipment Robustness of rotating disc technology, polypropylene discs and basins with long life span, few pumps
Oxygen has to be injected by blowers and aerators Oxygen is taken directly from the air when biomass is lifted above the waste water level
High requirements for civil works


simple requirements for civil works (require concrete slab)
Can not treat less than 40 % or more than 100 % of design capacity, lost biomass must be rebuilt after loss of flow Can easily adapt to flow rates of 10 to 110 % of the design flow rate, retains biomass even at very low flow rates
System can not easily be extended, can not be reduced once built System can be extended or reduced simply by adding or removing Bio-Disk®  moudles
Only pumps and equipment may be removed, civil works must be left behind or destroyed Bio-Disk®  lines may be relocated to a different site if necessary
Noise by pumps and blowers No noise
High odor disturbance Reduced odor disturbance because of high oxygen supply
High energy requirements  Extremly Low energy requirements
High manpower requirements Low manpower requirements
High spare parts requirements Low spare parts requirements
High running costs Low running costs

Comparison of Bio-Disk® and MBR systems.


MBR system


Bio-Disk®  system


Initial cost is very high compared to all other systems.


Initial cost is moderate

Membranes are very sensitive. Their optimum work depends on quality and quantity of sludge flocks. Variation in biological or hydraulic loads will block the membrane and affect the treatment high robustness of RBC technology, polypropylene discs and basins with long life span, variation in flow rate and biological load easily absorbed
high operation and maintenance costs low operation and maintenance costs
Membranes have to be flushed with clean water every 3 months and flushed with acid once a year ·      No flushing required, color of biofilm (micro-organic coating) on discs must be checked regularly (weekly), as well as pipes and greasers of bearings
·      Due to high pumping effort energy requirements are very much higher than in any other waste water treatment  system ·      Very low energy requirements as discs are only rotated around axis, no energy-intensive pumping

Comparison of Bio-Disk® and SBR.


SBR system


Bio-Disk®  system


·      Cleans sewage to an acceptable rate when well designed


·      can produce cleaner water than SBR system

·      Low initial equipments and maintenance cost ·      Initial cost is moderate

·      High initial civil works cost


·      Low civil works cost

·      High area usage in relation to capacity ·      Low area usage
·      Can not accommodate shock loads ·      Easily accomodates shock loads
·      High power requirements due to pumping activity ·      Very low power requirements
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