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PRODUCTS
> BIO-FILT®
| ROCHEM
BIO-FILT® PROCESS & FUNCTION
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 Concept,
design and operating procedure of the BIO-FILT®
membrane bioreactor have been developed by ROCHEM
UF Systeme GmbH, Hamburg, together with renowned
institutions.
The reliable function of this process and the operating
safety of the membrane filtration and bioreactor
technology have been proved by extensive studies
and tests with pilot plants.
• .The bioreactor is manufactured as modular multi-tank
construction from stainless steel. The adaptation
to the purification demand is achieved by the respective
design of the compact operating units.
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The Ultrafiltration unit consists of ROCHEM FM modules,
where the combination of open channel construction and
narrow gap technology allows for a highly efficient cleanability
and high availability - and thus for a safe and economic
operation. The ROCHEM FM module technology has been proven
over several years in many different areas of waste water
purification.
• The purification plant itself ensures an automatic,
reliable and fail-safe operation with a minimum of maintenance
and high availability. This is due to a construction that
is adapted to the client's needs by a well .established
manufacturing quality assurance system and a PLC based
process control. |
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OPERATION
The waste water is fed into the reactor chamber, designed
as a modular system, together with the process air.
 The
oxygen demand that is necessary for the biological degradation
of contaminants is controlled by an oxygen meter.
According to the needs (mobil plants or plants for ships,
industry or communities) and the degree of contamination,
the pretreated waste water is transported through the
modules in cross-flow, semi-cross-flow or dead-end operation
modes.
The biomass retained by the membranes is fed back to
the reactor together
with the partial stream circulating on the feed water
side of the membranes. The filtrate flowing through
the membranes
is pure and can be discharged.
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- Control
variables for the concentration of the biomass in the
reactor are the filtrate flux of the Ultrafiltration membranes
and the amount of concentrated sludge discharged from
the reactor.
The operating parameters -
like hydraulic retention time, oxygen demand, recirculation
volume, operating pres- sure, sludge discharge and energy
demand - depend on the application of the Bio-Filt® plant.
Suspended solids and germs do not pass to the filtrate
because of the small core size of the Ultrafiltration
membranes. The values for BOD and COD in the filtrate
depend on their concentration in the raw water and on
the operation of the bioreactor.
However in all applications investigated up to now these
concentrations have been below the specific limit values.
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IMPROVED
TECHNOLOGY FOR WATER PURIFICATION with
ROCHEM BIO-FELT®
The
combination of a high density biomass reactor with the FM
module system for Ultrafiltration forms the operating unit
of the membrane bioreactor ROCHEM BIO-FELT®
which gives several advantages for waste water treatment.
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SEWAGE |
INDUSTRIAL WASTE WATER |
BLACK WATER ON SHIPS |
In
combination with the separation of solid material the
membrane bioreactor allows for
• increase of the concentration of the biomass up to 20
g/l
• greatly reduced process time
• controlled safe separation of bacteria,
viruses and parasites due to the ultrafiltration membrane
that operates as a barrier
• compact construction with low space demand
• low cost operation even for small, decentralized plants |
The
complete retention of the biomass with membrane filtration
leads to a high biomass concentration in the reactor
and to a highly efficient biological reaction process
with:
• insensitivity to high loads of contaminants and changing
peak loads
• low space demand
• economic operation even for small 'decentralized plants
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The
efficiency of the ROCHEM BIO-FELT® plants allows
for the purification of black water on ships to achieve
a quality far below the international limit values for
contaminants imposed by MARPOL/IMO.
Therefore the environmentally sound purified waste water
can be
discharged overboard in any harbour or coastal area.
The BIO-FELT® system:
• is insensitive to changing peak loads
• achieves a safe disinfection of the purified waste water;
additional chlorination for disinfection l'not necessary
• requires only small installation space because of the
sectional design
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