METHOD OF PRODUCING DESALINATED WATER AND HIGH-PURITY WATER FOR NUCLEAR POWER UNITS FOR SCIENTIFIC CENTRES Russian patent published in 2012 - IPC C02F9/08 C02F1/28 C02F1/42 C02F1/44 

FIELD: chemistry.

SUBSTANCE: method involves feeding water for pretreatment from organic substances and active chlorine on a packed carbon filter and from suspended matter on a microfilter, further desalination of the water on two successive reverse-osmosis filters and post-treatment on an ion-exchange filter. The filtrate from the first reverse-osmosis filter with hardness of more than 0.5 mg-eq/l is returned through an intermediate vessel into the vessel for the starting water for re-treatment at the first reverse-osmosis filter, and at hardness of less than 0.5 mg-eq/l the filtrate from the first reverse-osmosis filter, before feeding into the input of the second reverse-osmosis filter, is corrected by alkanisation in an intermediate vessel to pH=8.3-9.0. The filtrate from the second reverse-osmosis filter is fed for post-treatment on the ion-exchange filter if said filtrate does not contain radioactive or chemically toxic contaminants, otherwise the filtrate is taken for decontamination.

EFFECT: longer life of the ion-exchange filter without reducing the service life of reverse-osmosis filters.

1 dwg