Mobile reverse osmosis system
AVRO-flex 400
Order no.
095 752 946-inter Edited by: phar-mrie G:\BA-752946-INTER_095_AVRO-FLEX_400.DOCX
11
3.1 Functional princi-
ple of the AVRO
system
AVRO is an alternative anti-scaling process to the common traditional
processes of "softening" or “antiscalant dosing”. Contrary to these
processes, AVRO does not require any addition of auxiliary additives.
The chemical composition of the generated concentrate is not modi-
fied. There is only a doubling of the concentration (standard recovery
50 %).
Hydraulically, the AVRO is installed in the concentrate pipe down-
stream of the membrane.
The treatment unit consists of two inert special electrodes to which a
low current is applied. Seed crystals (calcium carbonate) are gener-
ated at the cathode and are permanently directed via the concentrate
recirculation. The salts of the supersaturated concentrate continue to
grow on these seed crystals, and they are finally washed out to the
drain with the residual concentrate flow. This reliably prevents scaling
(deposits of insoluble salts on the membrane). Some of the calcium
carbonate remains on the cathode of the AVRO and due to increasing
electrical resistance, limits the service life of the AVRO treatment unit
to 3000 operating hours (permeate production) or 5 years.