Chemicals are used to
wash the membranes (coiled spiral, tubular, hollow fiber, ceramic) to remove
the fouling of different organic / inorganic / biological nature which,
depositing on the membranes themselves, can gradually reduce their
accelerates its course progressively due to the increase in surface roughness
and therefore an increase in the possibility of adhesion. It is therefore
necessary to plan carefully the frequency of washing, as well as the type of
the same (depending on the soiling agent) using specific detergents.
These detergents are
grouped into the following categories:
- Alkaline cleaners: they are
used for the removal of organic fouling. Their composition includes
alkaline components, sequestering agents, surfactants, wetting agents, ...
The pH varies from 11.5 to 14, while the operating temperature varies from
25 to 80 ° C.
- Acid detergents: they are used
for the removal of inorganic fouling. Their composition includes acid
components, sequestering agents, surfactants, wetting agents ... The pH
varies from 1 to 2, while the operating temperature varies from 25 to 60 °
- Anti-encrusting: prevent the
growth of the crystal lattice of the main salts: Calcium carbonate,
Calcium sulfate, Barium sulfate, Silicon, Iron.
- Sanitizers: they sanitize
membranes in Polyamide, Polysulfone, PVFD and remove bacterial films and
- Enzymatic detergents: they are
used for the removal of fouling by starches / proteins / fats. Their
composition includes enzymatic surfactant components, bleaching agents,