WO2002036248A1

WO2002036248A1 - Filtering device having a cylindrical first filter surrounding a membrane filtration unit

Info

Publication number: WO2002036248A1
Application number: PCT/NL2001/000790
Authority: WO
Inventors: Johan Jan Scharstuhl; Eric Scharstuhl
Original assignee: Prime Water Systems GmbH
Current assignee: Prime Water Systems GmbH
Priority date: 2000-10-26
Filing date: 2001-10-26
Publication date: 2002-05-10
Anticipated expiration: 2003-04-26
Also published as: NL1016486C2; AU2002224197A1

Abstract

The invention relates to a filtering device, comprised of a housing (10) with an inlet (1) and an outlet (2) connection, an exchangeable, substantially cylindrical activated carbon first filter (20) connected to the inlet connection (1), with a hollow core (21) extening along the cylinder axis, accommodating a membrane filtration module (30) that is connected to the outlet connection (2), the first filter (20) and the membrane filtration module (30) being connected in series, and the filtration module (30) comprising a bundle of capillary filtration membranes (32) whose open ends are connected to the outlet connection (2). The outer cylinder shell of the first filter (20) forms an inlet, and the inner shell of the first filter (20) surrounding the hollow core (21), forms an outlet for the first filter (20). The first filter (20) comprises a block of activated carbon. The membrane filtration module (30) comprises a module housing (31) surrounding the capillary membranes (32), embodied as a perforated tube accommodated in, and for the most part without contacting the hollow core (21) of the first filter (2). Around the block of activated carbon (20) a felt-like filter (40) is provided as a first filtering stage. The perforated shell (31) is provided with a membrane layer (60) comprising a water-insoluble biocidal polymer. The capillary membranes (32) may also be provided with a water-insoluble polymer.

Description

Filtering device having a cylindrical first filter surrounding a membrane filtration unit

The invention relates to a filtering device with the objective to provide conditions for the simultaneous elimination of microorganisms and the removal of dissolved organic and other contaminants from drinking water, under low-pressure conditions.

To this end the invention relates more particularly to a filtering device according to the preamble of claim 1.

Such filtering devices are known from the patent applications US-A-4, 636,307, WO91/05600 and EP 364 111. The known filtering devices comprise a housing having an inlet and an outlet connection. Inside said housing, an at least approximately cylindrical body is disposed in which an adsorption agent is provided, which cylindrical body with adsorbent forms the first filter. At the top side of this body there is an inlet for the liquid to be filtered. Above a bottom portion, the body is provided with a hollow core, while the top section of said bottom portion bordering the hollow core at the lower side is, provided with an outlet for the liquid. The activated carbon adsorbent is provided between the two cylinder walls and in the bottom part and, when in use, the liquid to be filtered flows through it. The filtration module with hollow fibres is disposed inside the hollow core. After the liquid is dis- charged through the outlet of the first filter, it will flow through the wall of the hollow fibres, thereby carrying out a subsequent filtering phase. The hollow fibres have an open end through which the filtered liquid is able to reach the outlet connection of the filtering devices. The drawback of the known filtering device is that the liquid has to travel a long way through the first filter, and that only an inlet and outlet of a limited size are available. The hollow fibres in use have a hydrophobic (water repellent) surface structure, and the result of

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M filtering phase provide a large filtering surface with an exceptionally good filtering capacity.

In an embodiment wherein the membrane filtration module comprises a module housing surrounding the capil- lary membranes, the module housing preferably comprises a perforated tube. The liquid filtered by the first filter and exiting from the inner wall of the first filter will, via perforations provided in the module housing, quickly reach the capillary membranes for a fastest possible pas- sage through the filtering device.

In order to avoid the formation of any obstruction for liquid exiting from the inner wall of the first filter, the module housing is, in a preferred embodiment of the filtering device, at least for the most part not in contact with the inner shell of the first filter that surrounds the cavity.

In accordance with a preferred embodiment of the invention, the membrane filtration module is provided with hydrophilic capillary membranes. Although the above-described embodiment affords an excellent solution for the removal of sediment, dissolved organic substances and microorganisms from water intended for the production of drinking water, it should be considered that the microorganisms that are still alive and that during the filtration process have collected in the space formed by the cylindrical hollow core and the module shell, have the tendency to grow through the membrane wall, especially under oligotropic conditions.

In order to render said microorganisms innocuous, a further preferred embodiment proposes the use of water- insoluble biocidal N-Halamine polymers such as, for example, described by S.D. orley et al. in Trends in Polymer Science, Vol. 4, No. 11 of November 1996. Such biocidal polymers have been shown to be able to kill microorganisms present in water, but are in practice not easily put to use.

For an efficient utilization it is necessary for a carrier material to be impregnated with the granular biocidal N-Halamine polymer. This is preferably a membrane S whose pore structure and size can be adapted to the size of the microorganisms, in order to provide sufficient opportunity for contact and enough time to render the microorganisms innocuous. Suitable carriers are membranes on the basis of cellulose, glass fibre, pes/pvp and zirconium oxide, as described in EP 0 624 283 Bl and in WO 00/29101.

According to the invention, the flat membrane produced with the aforementioned materials is to this end wound once or several times like a layer around the perfo- rated module shell. The water that has passed the charcoal block will now first flow through the biocidal membrane before exiting the filtering device via the capillary membranes and the outlet connection. By contacting the biocidal polymer in the membrane, the microorganisms are killed and will no longer be able to proliferate, or form a danger of growing through.

In an alternative embodiment, the biocidal polymer is incorporated in the surface structure of the capillary filtration membrane as described in WO 00/29101. In the following the invention will be elucidated with reference to the appended drawing, in which identical reference numbers refer to similar components, and in which:

- Figure 1 shows a longitudinal section through an embodiment of the filtering device according to the invention;

- Figure 2 shows an enlarged top view of the longitudinal section of Figure 1;

- Figure 3 shows a cross section through the fil- tering device according to Figure 1;

- Figure 4 shows a further preferred embodiment; and

- Figure 5 shows a cross section of the filtering device according to Figure 4. The filtering device according to the invention shown in the figures comprises a housing in the form of a beaker 10 with a screw lid 11. In order to seal, an O-ring (not indicated but visible in the Figures 1 and 2) is provided between the lid 11 and the beaker 10. The lid 11 is ω O t t H H tπ o u. o tπ o Ul

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Hi TJ a o co (D CO Φ tr φ H Ω <! μ- 3 h-¹ φ a μ- O φ H μ- Φ 3 Φ a 3

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Φ φ l-i O μ- Ω 3 X 3 SD O to rt a SD Ω H μ- ≤: rt μ- s: φ tr a o to tr 3 O 3 3 a Cfl tr a o ιQ (D Φ TJ CO • tr O SD 3 CD μ- " 3 φ rt tr Φ to CO Cfl Hi

*_* I-¹ rt o Hi Φ H ω Φ SD μ- φ φ tr 3 3 iQ rt Φ ιQ φ \-> o co o tr μ- o

Φ 3 O TJ CO 3 a D 3 TJ Φ Ω tr 3 rt ) o Ω H TJ Hi H a 3 3 tr 3 rt H l-i o o φ a 3 rt 3 Φ 3 H tr φ Ω h tr Ω o TJ φ o Φ l-¹ rt

3^* to Hi H SD φ rt^¬ Φ SD SD φ TJ a μ- Hi o 3 SD μ- SD φ s: - 3 rt Ω Ω Ω Cfl Hi o

Φ Hi o Co CD H* tr p3 l-i 3 rt 3 Φ t-¹ co μ- co rt (-• a 3 μ- TJ μ- μ- SD - O φ μ- Ω Φ μ- Φ rt^¬ rt μ- Ω Φ Q ^ a 3" tr 3 Φ φ Cfl H IT μ- vQ rt rt t o o Hi to co 3 I-¹ l-i ? rt

Hi cr SD SD tr Φ 3 H H Φ H a Cfl rt μ- o 3 Φ 3 O tr o Cfl 3 μ- ft Hi CO

O H I-¹ φ a ιQ μ- 3 SD 3 SD μ- SD μ- o μ 3 H a TJ TJ φ Ω μ- o •<: 1 ft O Ω

Φ Hi μ- tr O 3 φ rt H 3 3 Hi (D SD Cn iQ H H H¹ TJ SD H a TJ 3 3 Hi Hi O a O φ 3 3 tr Φ a Φ 3 Φ ιQ rt o μ- CO Φ Cfl Φ ι-i rt- ιQ μ- Hi 3

CO ιQ o Φ ~J a 3 1 rt tr O Ω TJ μ- tr ≤: Ω . H μ- TJ ω o O μ- _^ SD ω μ- SD 3 μ- rt a 1 _^ tr o O SD φ o o CD a 3 rt Hi TJ o Ω Ω Φ

CΛ 1 3 μ- φ Φ O 3 TJ H 3 H Ω ω Φ 3 rt 1 rt Ω co μ- 1 IV) 1 1 Φ l-i μ- μ- 1

Φ ι-i 1 1 1 1 1

ω ⁾ t t H >->

Ul 0 cπ 0 Ul 0 Ul

Ω rt^¬ TJ SD rt3 μ- ω rttr rt^¬ rt Φ rt a Ω ■J-- O SD μ- 3 3 TJ Ω tr rt Hi Hi rt μ- Hi rt^ l-i

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Φ l-¹ Φ < Ω --> H Φ 3 TJ μ- 3 3 --" Ω 3 tr <! μ- μ- Φ tr Φ ιQ Φ Φ TJ TJ a H Hi H μ-

Ω μ- (-' μ- ID Φ * 3 0 μ- φ a 0 TJ CO (D O a Φ 3 ιQ O σ 3 Φ H Φ H ι-i 3 tr Φ μ- φ 3 rt -a ^ SD TJ rt a 03 i-i Hi to H SD rt N 3 Φ φ Φ l-i CD Ω CO H ιQ

Φ 3 μ- CO Hi --^■ 3 μ- Hi μ- μ- --" X tr Φ 3 3 to 03 ■I-- a TJ CO 3 03 CO a μ- tr rt \-> 0 μ- ^< tr O to rt 3 rt rt μ- Φ a ιQ I-¹ Hi rt μ- 0 3 O _" 0 φ H Ω rt • T a * H tr I-¹ • Φ H ir O O tr M 3 1 • Φ σ . 3 _^ Ω Cfl tr O 3

SD a 3 Φ ID rt TJ Φ 3 rtφ rt --^■ ?τ^* Ω Hi a 3 TJ Hi tr μ- rt^¬ φ TJ 0 3 Hi r-3 H μ- X H H ι-3 H Φ tr rt- tr tr rtrt^¬ 0 Φ 3 O t-3 H l—¹ rtrt ω tr H 3 CO μ- tr CD

H μ- 0 rt 0 "< tr SD 3 0 μ- μ- Φ Hi φ tr tr Ω 3 H l-i tr μ- μ- ^< tr Φ 3 •» SD 0 φ μ- H μ- I-¹

--¹ TJ tr 3 Φ ft Φ 3 3 0 3 μ- Φ Φ W H tr a φ 3 3 Φ l-i Cfl rt Hi Ω t ω rt 03 I-¹ μ- --^■ tr Φ rt 3 μ- rt CO 3 h tr H 0 Φ rt ιQ 3 Hi φ 0 rt φ Φ

03 H- --^■ φ t-¹ 0 i-i μ- ^■^ CO SD O 0 μ- Ω t μ- O 3 a t-' O 3 <! rt^¬ 3 O X H a • 03 H Hi

•_* --^■

3 r-^> Φ Φ 3 μ- 3 CD 3 μ- tr rt --^■ 3 * O <! μ- 3 a SD tr H H 0 φ μ- _^ μ-

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0 0 Ω 3 μ- Φ CO H μ- s: H 3 ω <! a 0 μ- Φ 3 0 \-> -V !X rl-> a φ tr φ rt

X tr 3 a O 3 a t Φ rt^¬ t-¹ a "< μ- μ- 3 a μ- μ- 3 μ- 3 3 μ- rt^¬ ω μ- l-i tr φ Φ Φ μ- 3 Φ cT tr tr μ- rt Ω 03 φ SD rt3 3 Hi Ω Ω CO a 0 3 Ω 3 tr Hi 3 Ω

<! o X H H rt g- 3 3 t to Φ SD Φ O tr i-i rt^¬ tr CO φ μ- μ- tr J-. rt^¬

Φ SD Φ Φ μ- SD O 0 — ' a rt μ- SD ? X TJ {-• iQ

H H φ tr μ- Φ μ- tr (-^j rt I-¹ Ω H¹ 3 --• 0 a 0 tr l-i tr H 3 Ω CO I-' 3 3 _^ 3 rt. Φ SD Φ rt a rt Φ rt μ. •<. O Φ lΩ. TJ tr rt μ- Φ

H¹ CD rt rt rv> Φ ιQ H O tr t-¹ Cfl H¹ Φ tr 3 φ 0 3 rt _" CD I-¹ φ Hi 3 Hi

Φ 3 μ- CO tr Φ SD a Φ ^ t μ- CO μ- Φ H 3 H TJ tr O 3 H 0 H μ- O Ω

SD Φ ω O SD I-¹ SD 3 3 K H¹ O co tr Ω tHi Ω --^■ rt^¬ l-i ^ tr rt Cfl tr 3 3 Φ CO rt a r μ- Φ O SD SD TJ rt

Ω a --^■ tr O Hi 0 • : tr Ω 3 3 3 03 SD Ω μ- ?^ it-. rt tr 3

O 0 a SD (V) tr tr φ μ- 3 O K --¹ φ •< O iQ rt^¬ O Φ Ω rt^¬ Ω 0 φ φ CO μ-

Φ CO X t φ <1 0 Hi rt^¬ rtrt μ- I-¹ -" X tr <1 3 tr T O tr h-¹ 0 l-i 3

TJ t 3 • Hi Φ 0 rt^¬ μ- 3" Ω rttr tr Φ 3 •« tr μ- to a φ φ rt Φ Φ a φ φ Hi μ- φ CD rt c 3 a

3 • _"* μ- Hi 3 tr 3 O μ- tr rt Φ φ O a 0 3 Φ CA Φ H 3 Cfl to -f φ

0 03 3 rt^¬ Φ Φ a

3 a φ ir rt H μ- 3 a 3 <! l-¹ 3 03 O Ω CD 0 σ^* Hi l-i to > 3 SD tr rt^¬ rtO 3 Φ Ω μ- rt 03 Φ H μ- μ- Hi O 0 a tr Hi Ω 3 O μ- a μ- to --¹ Φ tr & 3 tr μ- l-¹ tr tr μ- J Ω μ- H O Ω -a 0 Hi 3 3 3 3 H rt SD a l-i 3 μ- rti-s Φ t-¹ φ l-i φ Φ 3 0 Ω SD Λ O 3 X 3 3 φ 3 H 3 rt H 0 μ- CO 3 μ- to X

Hi tr ^ Hi SD 3 ιQ 3 r H 3 to -• μ- ιQ 3 3 μ- rtCO Cfl Φ Ω 3 <! 3 a 3 rt μ-

Hi φ tr μ- μ- 3 3 -r 0 Φ (-^■ (D Ω μ- 03 !-• IX a <! a Ω tr Ω ; r a 0 (D TJ φ 03

3 3 0) < --• φ Φ H TJ CO 3 O ι-i O a μ- 0 t-¹ rtμ- μ- h-¹ Φ H μ- SD rtrf TJ rt^¬ 3 Hi

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3 SD ι-< l-i SD Φ . -. SD 0 SD μ- Φ Φ SD rt- 3 Φ rt^¬ 3 μ- φ Φ t^¬ μ- SD O σ 3 03 rt rt 0^* Φ a r tr 3 3 0 t-> tr H Cfl 3 tr tr μ- --^■ l a a SD t-¹ I-¹ Ω φ tr tr Φ l a

O H Cf Φ tr 3 3 0 O Φ H M TJ Cf μ- a Hi φ φ 3 rt 0 μ- CD 3 0 l-i Φ

3 Φ tO Φ CO rt rt Cfl Φ tr 0 3 O Cfl μ- tQ Φ Hi μ- Hi Ω trtt rt -a H rt 0 X μ- TJ rt^¬ 3 TJ 0 μ- O to rt --^■ Ω r rt^¬ μ- Hi H l-i 3 μ- ? 3 tr SD Ω 3 3 μ- tr Φ H Hi i-s a Hi Hi _^ O μ- en t 0 fV tr tr φ 3' Ω tr rt 3 H- O μ- O {—• μ- 0 H ? ιQ Ω

Φ Φ Φ μ- 3 3 0 H¹ Ω Φ --^■ μ- 0 φ Φ t-^> --^■ ι-i 3 3 rtrtr to a 3 ^ μ- rt

X Cfl Ω 0 <! rt^¬ 3 a _^ Λ t 3 I-¹ ω 3 H Φ rt ιQ tr Φ 0 0 3 TJ Φ

O 3 Φ 0 TJ μ- rt tr 3 φ μ- rt O TJ TJ tr rt φ Hi rt^¬ Φ H • rt to Hi Hi tr a

3 (-^■ 3 3 Φ Ω ι-i Φ a 3 Ω O rt K) tr Φ μ- Hi H H J-- 1-. O t^¬ CD rt I-¹ rt O a tr 0 0 μ- r

1 3 Φ SD a CD tr O 3 Φ H 3 μ- μ- 0 Ω Φ H Φ Φ 3 Ω CΛ *« --^■ 3 tr O μ- ω • rt Ω to rt- H φ 3 TJ I-¹ Cfl Ω O a < H 3 3 tr rt Ω Φ φ 3 μ- μ- φ <! μ- SD 3 0 Φ Φ 3 a SD Φ rt rt Φ t*r rt 3 H μ- rt H Ω φ Hi Φ rt a 3 3 μ- 0 TJ tr Hi a a SD 3 tr 3 tr φ a tr 1 Φ Ω . 1 tr O H μ- 0 φ 3 3 3 1 1 *» Ω 1 φ H 0 SD 1 Φ H 1 1 Hi

•< to tr a

Φ Hi rt 3

a via the block of activated carbon 20 and the filter 40, after which the air can be released from the filtering device via a conventional vent connection 50. When, as in the present invention, a block of activated carbon 20 and a filter 40 are used as first filter, any air collected in the hollow core 21 can easily escape via the block 20 and the filter 40 to the vent 50, and extremely hydrophilic membranes 32 that are very permeable to the liquid to be filtered may be used in the filtering device. A further preferred embodiment is shown in Figure

4 and Figure 5.

The Figures 4 and 5 substantially correspond to the Figures 2 and 3, on the understanding that the perforated shell 31 is provided with a membrane layer 60. -This membrane layers 60 is provided with a water-insoluble, preferably granular biocidal polymer. In this way any remaining microorganisms in the water to be treated will be killed so that they will no longer be able to proliferate or be likely to grow through.

The embodiment of the filtering device described above must not be understood as a limitation of the invention. It is possible to realize various embodiments within the scope of the invention and the appended claims.

Claims

1. A filtering device, comprised of a housing with an inlet and an outlet connection, an exchangeable, substantially cylindrical activated carbon first filter connected to the inlet connection, with a hollow core ex- tending along the cylinder axis, accommodating a membrane filtration module that is connected to the outlet connection, the first filter and the membrane filtration module being connected in series, and the filtration module comprising a bundle of capillary filtration membranes whose open ends are connected to the outlet connection, characterized in that the outer cylinder shell of the first filter (20, 40) forms an inlet, and the inner shell of the first filter (20, 40) surrounding the hollow core (21), forms an outlet for the first filter (20, 40) .

2. A filtering device according to claim 1, characterized in that the first filter (20, 40) comprises a block of activated carbon (20) .

3. A filtering device according to claim 2, characterized in that the activated carbon is chosen from a type that is capable of adsorbing organic substances and metals.

4. A filtering device according to claim 2, characterized in that the first filter (20, 40) comprises a first filtering phase (40) provided around the block of activated carbon (20) , forming a supplementary filtering phase preceding the block of activated carbon (20) .

5. A filtering device according to claim 1, characterized in that the same comprises a perforated module housing (31) that is accommodated in the hollow core (21) of the first filter (20, 40) .

6. A filtering device according to claim 5, characterized in that the module housing (31) comprises a membrane filtration module.

7. A filtering device according to claim 6, characterized in that the membrane filtration module is provided with hydrophilic capillary membranes.

8. A filtering device according to one of the preceding claims, characterized in that the perforated module housing (31) is provided with a membrane layer

(60), which is provided with a water-insoluble biocidal polymer.

9. A filtering device according to one of the preceding claims, characterized in that the hydrophilic capillary membranes are provided with a water-insoluble biocidal polymer.