SOLUTIONS - MICRODYN-NADIR GmbH

ART
Environment
SOLUTIONS
The art to clear solutions

Waste Water Treatment -
Oil / Water Separation and More...
Membrane technology – as a modern and innovative
technology – has advanced significantly in
the last few years and is established in numerous
methods for waste water treatment and water
recycling.
In many processes where waste water streams
are produced, membrane technology has developed
into state-of-the-art method for treating water by
micro, ultra and nanofiltration and is applied on a
world-wide scale. The filtration methods are effective,
save energy and resources and are environmentally
friendly.
MICRODYN-NADIR GmbH, which emerged from the
membrane activities of Hoechst AG and Akzo AG,
looks back on a long experience with the development,
manufacture and application of membranes and
modules. On this basis, MICRODYN-NADIR assists
you with advanced technologies for optimising the
processes and methods in the waste water treatment
and water recycling sectors.
MICRODYN-NADIR products are designed for various
pressure-driven membrane processes in cross-flow,
semi and dead-end-operation, under normal as well
as extreme conditions. We supply high quality membranes
and modules made from PP, PE, PES, PVDF
and regenerated cellulose.
When selecting a suitable membrane or module,
the chemical resistance often plays a decisive role in
addition to the efficiency. MICRODYN-NADIR also
possesses of long experience with the use of membrane
and module materials regarding this issue.

Free oil
phase
Feed
Membrane Products
for Treatment of Oil / Water Emulsions
Discharge
Example: Drilling and Cutting Oil Concentration
Micro and ultra filtration are widespread processes
for treating oil / water emulsions, which are produced
as waste water streams in numerous process steps
in various areas such as car-wash plants, canteen
kitchens, ships and the food industry.
These waste water streams must be purified in
accordance with the statutory regulations. Micro
and ultrafiltration are used to reliably treat this water
by separating emulsified and non-emulsified oils,
fats and lipophilic substances, as well as particles
and reducing the COD value.
This process results in a low-volume concentrate
stream in which this matter accumulates and a
filtrate stream, which satisfies the statutory regulations
concerning hydrocarbons and lipophilic substances.
Furthermore, this filtrate, with its distinctly
reduced COD value, can be further treated using
nanofiltration or reverse osmosis.
In addition to the filtrate, which conforms to the
statutory regulations and can be discharged without
causing additional tasks, there is also a potential
to save on the concentrate disposal.
PI
PI
FI
SPIRA-CEL ®
UF-Module
Oil-free
permeate
Since membrane technology is a purely physical
process where chemicals are used only in the membrane
cleaning process, it is a particularly environmentally
friendly and resource saving solution for
treating waste water streams. This method satisfies
modern concerns for environmental protection.
This procedure makes special demands on the
membrane and the module regarding the stability,
flux rate and rejection.
Because of the high membrane and module stability,
both SPIRA-CEL ® spiral wound modules
and MICRODYN ® tubular and hollow fibre modules
have proven their worth in this application field.
Membranes made from Polyethersulfone are particularly
effective where the cleaning process or the
operational parameters make high demands on
the chemical, temperature and pH stability. In applications
with less extreme requirements, membranes
made from regenerated cellulose demonstrate superior
cleaning, performance and lifetime behaviour
due to their outstanding hydrophilicity, and ensure
the efficiency of the process.
The wide range of available membrane and module
types made of different polymers ensures that the
modules can be perfectly configured to suit the
processes and separation tasks to optimise the
capacity and efficiency of the process.

Characteristics
of Cross-Flow Filtration
Feed Flow
Permeate
In cross-flow filtration, the process flow is pumped
parallel to the membrane. This concept promotes
mixing of the process flow during filtration and
counters the accumulation of particles and molecules
on the membrane surface. Particles that
are deposited on the membrane surface are
largely flushed away.
This is the reason why cross-flow filtration
allows for stable flow rates through the membrane
over long periods of time, even for media that
are difficult to filter.
Concenteate
Membrane
Overall, the prevention of the formation of a
fouling layer and the better mixing of the process
flow allow for a larger throughput and a more
stable process than could be achieved with
conventional filtration.
When performing cross-flow filtration on a particular
liquid, the effect is significantly influenced
by the choice of membrane, the module geometry
(respectively the module design) as well as by
the main process parameters pressure and cross
flow velocity at the membrane surface. The process
performance furthermore depends on many
different factors.
MICRODYN-NADIR has long experience with
the assessment of these influencing factors for
optimizing membrane separation processes.

SPIRA-CEL ®
A new Generation of Membrane Products
Our new generation of membranes and elements
for micro, ultra and nanofiltration provides increased
productivity and stability.
Our membranes are available in roll stock, flat sheet,
die-cuts, spirals, cassettes, hollow fibers cartridges
and tubular configuration and a wide range of standardized
or customized modules depending on the required
membrane material and molecular weight cut-off
(MWCO).
FW 50
Application Properties Advantage
Biomass separation
Drinking water treatment
Filtration of
gravel filter backwash water
Waste water
from car-wash plants
Treatment of bilge water
Waste water from
canteen kitchens
Dairy waste water
Waste water
from the cosmetic industry
Treatment of detergent solutions
Retention of the biomass,
germ reduction
Separation of germs
and colloids
Separation of cloudy material,
colloids and germs
Separation of oil,
colloids and particles
Removal of oil
and particles
Separation of
lipophilic substances
Separation of
lipophilic substances
Separation of fats,
COD reduction
Separation of
particles and fats,
COD reduction
Modules are available in sanitary and industrial
versions for high temperature and high pH conditions.
We support our customers in the development of
processes by providing these services and with decades
of know-how from the chemical industry
(Hoechst AG, Akzo AG). Moreover, we are able to
offer the shortest possible delivery times, irrespective
of the order volume.
Water recycling, efficiency increase,
compliance with statutory regulations
High operational safety, high efficiency
Water recycling, efficiency increase,
cost saving
Water recycling, cost saving
Volume reduction, compliance with
statutory regulations
Savings on waste water taxes,
compliance with statutory regulations
Savings on waste water taxes,
compliance with statutory regulations
Savings on waste water taxes,
compliance with statutory regulations
Recycling, savings on waste water taxes
and fresh water usage

L@L Design • Getty Images
Support
Pre-Sales
Product information for membranes and modules
Technical advice and recommendations for application
Systems and processing advice
Process and method evaluation
Laboratory evaluation
After-Sales-Service
Implementation of effective cleaning methods
Module cleaning
Evaluation of cleaning methods
Servicing of modules in operation
Please contact us for further information about
MICRODYN-NADIR products & applications.
Food & Beverages
Paint & Automotive
Pharma & Biotechnology
Chemical
Metal
Electronics
MICRODYN-NADIR GmbH
Rheingaustr. 190 - 196 • D-65203 Wiesbaden
Tel.: + 49 (0) 611- 962 - 6001 • Fax: + 49 (0) 611- 962 - 9237
info@microdyn-nadir.de • www.microdyn-nadir.de
MICRODYN TECHNOLOGIES INC • USA
Po Box 98269 • Raleigh NC 27624
Tel.: + 1 919 872 - 9375 • Fax: + 1 919 872 - 9375
infoUSA@microdyn-nadir.de • www.microdyntech.com
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