MANN+HUMMEL MICRODYN MD020CP2N Manual de usuario

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

MICRODYN

Capillary Modules

User Manual

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

Contact

Europe

Germany: +49 611 962 6001

Italy: +39 0721 1796201

info@microdyn

-nadir.com

Americas

USA: +1 805 964 8003

sales.mnus@microdyn

-nadir.com

Asia

Singapore: +65 6457 7533

China: +86 10 8413 9860

waterchina@mann

-hummel.com

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

Table of Contents

1Introduction ......................................................................................................................................4

2Product Description....................................................................................................................5

2.1

PRODUCT DESIGN ...................................................................................................................... 5

2.2

CROSS-FLOW MICROFILTRATION .............................................................................................. 5

2.3

PRODUCT CODES & MODULE TYPES......................................................................................... 5

3Shipping, Handling & Storage.................................................................................................6

3.1

SHIPPING & HANDLING............................................................................................................... 6

3.2

STORAGE CONDITIONS .............................................................................................................. 6

3.3

RETURNING A MODULE.............................................................................................................. 6

4Installation & Activation.............................................................................................................7

4.1

INSTALLATION............................................................................................................................ 7

4.2

ACTIVATION WITH WATER PRESSURE ...................................................................................... 8

4.3

ACTIVATION WITH WETTING AGENTS........................................................................................ 8

5Operation.......................................................................................................................................9

5.1

GENERAL SYSTEM SET-UP ........................................................................................................ 9

5.2

PRESSURE DROP AND TRANSMEMBRANE PRESSURE............................................................. 9

5.3

OPERATION PROCESSES ...........................................................................................................11

5.3.1 Open Loop Operation............................................................................................................................11

5.3.2 Closed Loop Operation .........................................................................................................................11

5.3.3 Multistage operation ............................................................................................................................ 12

5.4

PERIODIC BACK PULSE (PBP)...................................................................................................13

5.4.1 PBP with Compressed Air....................................................................................................................14

5.4.2 PBP with Pump Pressure ..................................................................................................................... 15

5.4.3 Backwashing with Special Pump & Disconnected Feed Pump .............................................................16

5.5

ADJUSTMENT OF FILTRATE FLOW ...........................................................................................16

5.6

CHEMICAL CLEANING ...............................................................................................................19

6Piloting ........................................................................................................................................20

6.1

FILTRATION WITH CONSTANT CONCENTRATION ....................................................................20

6.2

DETERMINING MAX CONCENTRATION FACTOR ......................................................................20

6.3

SETTINGS FOR PERIODIC BACK PULSE ..................................................................................20

6.4

CLEANING TESTING..................................................................................................................20

7Appendix...................................................................................................................................... 21

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

1Introduction

MANN+HUMMEL Water & Fluid Solutions (WFS) offers a wide variety of capillary modules under the MICRODYN brand.

MICRODYN cross-flow microfiltration (MF) modules are used to separate suspended solids larger than 0.2 micron.

The highly porous polypropylene (PP) membrane is backwashable, allowing for stable and efficient filtration with continuously

high product flux.

The smart construction techniques employed in the module manufacturing allow them to be used in applications that require

highly stable polymer materials, pH stability (0 to 14), and high resistance against abrasive substances.

The advantages of MICRODYN microfiltration modules include:

•Well-defined flow conditions

•High packing density

•Minimized dead zones

•Extremely abrasion resistant

•Strong chemical resistance

•Backwashable

•Low specific energy consumption

Typical applications where MICRODYN capillary modules are used are food applications like wine and vinegar filtration or

pharmaceutical applications where specific proteins are concentrated.

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

2Product Description

2.1

PRODUCT DESIGN

MICRODYN capillary modules contain a bundle of symmetric, hydrophobic polypropylene capillary membranes with a nominal

pore size of 0.2 micron. The capillary membranes are potted in polyurethane. MICRODYN capillary modules were developed for

cross-flow microfiltration (CMF), a modern filtration procedure for separating suspended solids and for low concentrations of

emulsions.

2.2

CROSS-FLOW MICROFILTRATION

The feed flows inside the membrane lumen (or inside the membrane fibers) are as shown in Figure 1. A part of this feed exits the

capillary membrane as filtrate, or clean water, due to a pressure difference across the membrane. The remaining liquid is called the

retentate/concentrate.

Feed Retentate

Filtrate

2.3

PRODUCT CODES & MODULE TYPES

The following coding applies to MICRODYN products:

MD150

Module Type & Size Membrane Geometry &

Shell Material Pore Size (0.2µm) &

Module Length Module Connection

(∅diameter of housing in mm)

CP: Capillary membrane

with polypropylene housing

FP: Hollow fiber membrane

with polypropylene housing

CS: Capillary membrane

with Stainless Steel housing

CU: Capillary membrane

with Polysulfone housing

CV: Capillary membrane

with PVC/PVC-C housing

M: medium

N: normal

AF: ANSI flange

DF: DIN flange

JF: JIS flange

C: Clamp connection

F/R

CC: Clamp connection

F/R/P

AS: Thread connection

Please refer to Appendix 1, Table 1 for an overview of available MICRODYN capillary modules.

For more module-specific data, please refer to the respective datasheet on the webpage (Capillary & Tubular Modules -

MANN+HUMMEL Water & Fluid Solutions (microdyn-nadir.com)

Figure 1. Scheme of lumen function.

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

3Shipping, Handling & Storage

3.1

SHIPPING & HANDLING

Transportation and handling of MICRODYN capillary modules should be done with extreme care as a module may crack or break if

dropped. Having proper equipment is also essential for safely handling the modules.

Modules should not come into contact with organic solvents, nor should splicing tape be used as this may lead to the damage of

the module casing.

Wipe the module casing with water or ethanol to remove debris from the module casing.

3.2

STORAGE CONDITIONS

The following conditions are recommended when storing the modules:

•Store the modules inside a cool building or warehouse out of direct sunlight.

•Temperature limits: between 5°C and 35°C (41°F and 95°F).

•Humidity must not exceed 70%.

•All new modules being stored prior to use should remain in original packaging.

3.3

RETURNING A MODULE

If a module is returned for any reason, MANN+HUMMEL WFS must approve the shipment first. Please contact the appropriate

MANN+HUMMEL WFS representative before sending the product back. Non-approved return shipments will be rejected.

If MANN+HUMMEL WFS approves a return of a module, it must be appropriately cleaned, preserved, packed, and labeled to

transport safely and retain the integrity of the materials.

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

4Installation & Activation

4.1

INSTALLATION

MICRODYN capillary modules may be installed into a system vertically or horizontally.

A horizontal position is recommended for filtration of suspensions with a large quantity of solids (Figure 2). While each module has

two permeate outlets, only one is typically used during filtration. In the horizontal position, the permeate port must be facing

upwards to allow the module to fill fully with liquid. Additionally, the permeate port should be at the end of the module (low

pressure side) if the module is in the horizontal position.

Feed Concentrate

Permeate

Drainage for

Cleaning

In the vertical position, the permeate outlet must always be toward the top of the module so that air can be removed completely

from the module prior to operation (Figure 3).

Concentrate

Feed

Drainage for

Cleaning

Permeate

Figure 2. Module in the horizontal position.

Figure 3. Module in the vertical position.

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

4.2

ACTIVATION WITH WATER PRESSURE

Typically, activation of the module’s membranes is required. The PP membrane is hydrophobic in nature. Liquids like water with

high surface tension of 0.072 N/m do not wet the membrane.

A simple and safe way to activate the membrane in the module(s) is the use of water at higher pressure. The first step is to fill the

module(s) bubble free with water (25 °C) from both sides (feed and permeate side). A pressure of 6 bar must be applied to the

module(s) for 1 minute. Typically, this is the tap line pressure. (Please notice the difference to the max. operating pressure given in

the data sheet.)

After this procedure, the pressure must be released to zero. The water must be exchanged, and the procedure must be repeated

four to six times. Now the module is activated and can be used for filtration.

4.3

ACTIVATION WITH WETTING AGENTS

For all filtration purposes where the module must be tested by a bubble point test for process safety reasons, the module has to be

activated by means of water-soluble liquids with a surface tension of less than 0.035 N/m.

Appropriate liquids to be used are:

•a mixture of water and 50 vol. % of isopropanol

•a mixture of water and 25 vol. % tert. butanol (not inflammable)

•surfactants

With this method, it is necessary to run the module in a system for about 30 minutes in cross-flow mode until a sufficiently high

flux is reached.

After wetting, the module is flushed either with water or with the solution to be filtered to rinse any remaining agents. As long as it

stays in fluid, the membrane is activated. If the membrane dries up, it must be activated again as per the description. The

membrane’s separation properties will not change by drying.

Heavily gasifying liquids (carbonated beverages or beer) require a counter-pressure on the permeate side (e.g. 1 bar) in order to

prevent the release of gases. Gases will deactivate the membranes.

In the PBP process, a part of the permeate is pushed back by compressed gas (e.g. air). Care must be taken so that the gas is not

pressed into the membrane. Otherwise, the membranes will be made a partially hydrophobic with reduced flux. A reactivation

must then be performed.

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

5Operation

5.1

GENERAL SYSTEM SET-UP

In cross-flow filtration, a liquid is pumped through the modules. A typical arrangement is shown in Figure 4 below. The favorable

flow velocity for MICRODYN modules ranges between 1-2 m/s (3.3-6.6 ft/s).

5.2

PRESSURE DROP AND TRANSMEMBRANE PRESSURE

For filtration to occur, the inlet, or feed pressure (P1), must be greater than the outlet pressure (P2) and filtrate pressure (PF), as

shown in Figure 5. This difference in pressure, also called pressure drop, is the loss of pressure from the feed end to the

concentrate end of a module and occurs due to the resistance of flow.

To achieve stable filtration, begin operation at a low feed pressure and gradually increase the feed pressure until optimal filtration

performance is achieved. The driving force for filtration is the transmembrane pressure, which is defined by the difference of the

pressure on the filtrate side and the averaged pressure on the feed/concentrate side (see also below equations). The allowable

operating pressure is listed on the respective product data sheet.

Pressure

Module Length

Pressure Drop in

the Module

Effective Operating

Pressure

Concentrate

Permeate

Back Pulse

Tank

Feed

Figure 4. Simplified flow diagram using MICRODYN modules.

Figure 5. The pressure drop along the length of the module.

MICRODYN CAPILLARY MODULES | USER MANUAL

MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021

To calculate the pressure drop and transmembrane pressure, please refer to the below equations.

Pressure drop:

∆P = P

1−P

Transmembrane (operating) pressure:

TMP =

1−P

2−P

The energy consumption of a cross-flow microfiltration system is determined mainly by the circulating volume and the pressure

losses of the module. The pressure loss is affected by:

•The properties of the circulating fluid (e.g. rheological behavior, viscosity, and the concentration of suspended particles)

•The velocity resistance in circulation (modules, fittings, piping system)

•Operating conditions (flow velocity)

The greatest resistance to velocity in circulation occurs when the modules are operated in parallel or in series. Figure 6 shows the

relationship between pressure drop and the mean linear velocity of water through MICRODYN capillary modules at 20°C.

Figure 6. Relationship between pressure drop and velocity of water at 20°C measured in a MD 150 CP 2N.

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