DE4226673A1

DE4226673A1 - Filter cleaning - uses compressed air saturated with solvent in spray to force residual permeate back through membrane pores followed by further cleaning with compressed air or water

Info

Publication number: DE4226673A1
Application number: DE19924226673
Authority: DE
Inventors: Gunther Grigarczik
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-12
Filing date: 1992-08-12
Publication date: 1994-02-17

Abstract

For the cleaning of filter, micro-filter and ultrafilter assemblies, initially the permeate runs freely out of the module through an intermediate pressure vessel. In the back rinsing process, compressed air or other gas medium is delivered by a jet through a compressed air connection directly at the permeate outlet of the module, saturated with a special fine spray of solvent or other medium. The residual permeate is forced back through the module and the sprayed solvent is forced into pores of the membrane. Through a compressed air valve at the vessel, clean compressed air forces any permeate or clear water in the vessel back to give the membrane further cleaning. USE/ADVANTAGE - Used for cleaning filters where they can be heavily clogged. The back rinsing action gives an effective cleaning operation, to increase the filtering effect, and prevent build-up around the membrane assembly.

Description

Die Erfindung bezieht sich auf die kontinuierliche Reini gung von Membranen oder Filtern in Ultrafiltrationsanlagen, insbesondere für extrem versetzende Medien.The invention relates to continuous cleaning delivery of membranes or filters in ultrafiltration systems, especially for extremely moving media.

Derzeitig werden die Membranen in Mikro- oder Ultrafiltra tionsanlagen mit Wasser oder mit Permeat rückgespült, wobei das zu filternde Medium drucklos umgepumpt wird. Manche Medien neigen zum Zusetzen der Membran, wodurch der Einsatz der Mikro- oder Ultrafiltrationstechnik für diese Medien nicht möglich oder die Leistung eingeschränkt wird.The membranes are currently in micro or ultrafiltra backwashing plants with water or with permeate, whereby the medium to be filtered is pumped without pressure. Some media tend to clog the membrane, causing the use of micro or ultrafiltration technology for these media are not possible or performance is limited becomes.

Ziel der Erfindung ist es, einerseits durch ein spezielles Rückspülverfahren die Leistungsfähigkeit der Membranen zu erhöhen, gleichzeitig das Ansetzen von Restschlämmen an die Rohrinnenwand der Membran zu verhindern und den Energiebedarf der Ultrafiltrationsanlagen zu reduzieren.The aim of the invention is, on the one hand, through a special Backwashing the performance of the membranes increase, at the same time the preparation of residual sludge to prevent the inner tube wall of the membrane and the Reduce energy consumption of ultrafiltration systems.

State the nature of the invention

Die Anlage wird so aufgebaut, daß das Permeat über einen Druckbehälter, der von unten den Permeatzulauf und oben den Permeatauslauf hat, frei ausläuft. Während des Spülprozesses wird zunächst das am Auslauf des Druckbehälters befindliche Ventil geschlossen und Druckluft direkt am permeatseitigen Modulauslauf eingeblasen. Dabei saugt die Druckluft über ein Rückschlagventil und eine Venturidüse ein Lösungsmittel an, welches sie sättigt. Die gesättigte Druckluft drückt zunächst das im Modul befindliche Permeat zurück in den Retentatstrom. Anschließend wird die Membran mit der gesättigten Luft gespült, wobei sich das Medium in den Poren der Membran absetzt und dabei die angesetzten Schadstoffe löst. Um den Permeatstrom frei aller Lösungsmittel zu halten, wird anschließend mit dem sich im Druckbehälter befindlichem Permeat oder mit Wasser nachgespült. Um das Ansetzen von Schlämmen an die Innenwände der Ultrafiltrationsmembranen zu verhindern, wird im Pumpkreislauf des zu filternden Mediums nach der Pumpe zusätzlich Druckluft oder ein spezielles Gas eingeblasen, welches ebenfalls mit dem Lösungsmittel gesättigt werden kann. Diese Druckluft erhöht einerseits die Turbulenz und Fließgeschwindigkeit des zu filternden Mediums und verhindert das Ansetzen von Schlämmen und Versetzen der Membran. Andererseits können zusätzende Medien ausgefällt, die Oberflächenspannung des zu filternden Mediums oder die Viskosität dieses Mediums reduziert werden.The plant is constructed in such a way that the permeate has a Pressure vessel, the permeate inlet from below and above has the permeate outlet, runs out freely. During the The rinsing process is first that at the outlet of the pressure vessel located valve closed and compressed air directly on Blown in the permeate-side module outlet. It sucks the compressed air via a check valve and a Venturi nozzle a solvent that saturates them. The saturated Compressed air first presses the permeate in the module back into the retentate stream. Then the membrane flushed with the saturated air, leaving the medium settles in the pores of the membrane and thereby the attached Solves pollutants. To free the permeate stream of all solvents to hold, is then with the in the pressure vessel permeate or rinsed with water. To do that Attaching sludge to the inner walls of the Preventing ultrafiltration membranes is in the pump circuit of the medium to be filtered additionally compressed air after the pump or blown in a special gas, which also can be saturated with the solvent. This compressed air on the one hand increases turbulence and flow velocity of the medium to be filtered and prevents it from sticking of sludge and dislocation of the membrane. On the other hand additional media can precipitate, the surface tension of the medium to be filtered or the viscosity of this medium be reduced.

Claims

1. A process for backwashing filter, microfilter or ultrafiltration systems, characterized in that the permeate initially flows freely out of the module via an intermediate pressure container and, during the backwashing process, compressed air or another gaseous medium is blown in directly at the permeate outlet of the module via a compressed air connection. which has been saturated by a nozzle with special, finely sprayed solvents or media, which first flushes the residual permeate back through the module and then presses the sprayed solvent into the pores of the membrane, then is cleaned with a second compressed air valve, which is located on the pressure vessel Compressed air, the permeate in the container or backwashed with clear water, whereby the membrane is cleaned.

2. Process for backwashing filter, microfilter or Ultrafiltration systems according to claim 1, characterized, that before, during or after the backwash process in the flow direction in front of the module in the pump circuit of the filter Medium compressed air or another gaseous medium is blown in as in claim 1 with a Medium can be saturated.

3. Process for backwashing filter, microfilter or Ultrafiltration systems according to claim 1, characterized, that instead of the compressed air saturated with a medium briefly the solvent, which is also in permeate or water can be dissolved, or in combination is flushed with compressed air and then with permeate is rinsed.