Bactéries tuant dans les membranes de nanofiltration et précautions d'installation

Les membranes de nanofiltration sont de plus en plus populaires en raison de leurs nombreux avantages, dont l'un est leur capacité à tuer les bactéries. Alors, quelles sont les différentes méthodes de stérilisation bactérienne pour les membranes de nanofiltration?

Diverses méthodes de stérilisation pour les membranes de nanofiltration

Les méthodes physiques de stérilisation bactérienne pour les membranes de nanofiltration comprennent le chauffage, la pression osmotique, le rayonnement et la filtration. La chloration des systèmes d'eau ultrapure est une méthode efficace pour tuer les bactéries dans l'eau. Le chlore réagit avec l'eau pour produire de l'acide hypochloreux, de l'ozone, du dioxyde de chlore, de l'alcool et des agents de détartrage. Les faibles valeurs de pH sont plus favorables à la production d'acide hypochloreux. À des valeurs de pH plus élevées, l'acide hypochloreux se dissocie en ions hypochlorites.

L'acide hypochloreux a un fort effet bactéricide. Il peut pénétrer les parois cellulaires bactériennes et les détruire. Le pouvoir oxydant de l'ion hypochlorite est 100 fois celui de l'acide hypochloreux, donc des valeurs de pH élevées ne sont pas propices à la stérilisation (parce que les ions hypochlorite sont rapidement réduits, ce qui ne laisse pas le temps de tuer les bactéries). Les méthodes de stérilisation équivalentes comprennent le traitement de l'ozone et l'oxydation UV.

Les méthodes chimiques de stérilisation bactérienne pour les membranes de nanofiltration comprennent l'ozone, le chlore, l'alcool et les agents de détartrage.

L'oxydation UV est une autre méthode de stérilisation bactérienne pour les membranes de nanofiltration. Lorsqu'il est exposé aux rayons UV, l'ADN des bactéries est modifié et ce processus est irréversible. L'ADN des bactéries est facilement irradié par le rayonnement UV, de sorte que toute la bactérie est désactivée. La puissance des lampes UV pour désactiver les bactéries dépend du type de lampe, de la durée d'exposition, du temps de séjour et du débit de l'eau à travers la lampe UV.

Considérations pendant l'installation de la membrane de nanofiltration

Lors de l'installation de membranes de nanofiltration, il y a quelques choses à garder à l'esprit. Les membranes de nanofiltration sont une variété spéciale et prometteuse de membrane de séparation qui porte le nom de sa capacité à retenir des substances de dimensions nano environ. Ils sont utilisés pour éliminer la matière organique et la couleur dans l'eau de surface, éliminer la dureté des eaux souterraines, éliminer partiellement les sels dissous, concentrer les jus de fruits et séparer les substances utiles des médicaments.

Rincer la nouvelle membrane avec de l'eau perméat pendant deux heures après l'installation initiale et jeter l'eau.
Évitez la contre-pression lorsque l'élément de membrane produit de l'eau.
Lorsque les valeurs de pH sont supérieures à 10, les températures fonctionnent continuellement à 35 ℃, ou le chlore libre ou d'autres substances oxydantes sont présents dans l'eau influente, les performances de la membrane peuvent être gravement affectées en raison de ses propriétés oxydatives.
Si la chute de pression de l'élément de membrane est 1.5 fois supérieure à la valeur initiale, l'élément de membrane doit subir un nettoyage chimique.
Toutes les membranes de nanofiltration subissent des tests d'eau stricts avant de quitter l'usine, puis emballées sous vide avec une solution 1% de bisulfite de sodium pour protéger les éléments de la membrane et empêcher la croissance microbienne.

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Use Memory: 8.4MB

Time-consuming: 1.13553 ms

Bactéries tuant dans les membranes de nanofiltration et précautions d'installation

Diverses méthodes de stérilisation pour les membranes de nanofiltration

Considérations pendant l'installation de la membrane de nanofiltration

RELATED_NEWS

Membrane RO spirale dans le dessalement de l'eau de mer

Application de la filtration membranaire dans l'édulcorant

Dernières recherches et développements dans les matériaux membranaires MF

Régénération et nettoyage de la membrane céramique

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