APPARATUS FOR THE PURIFICATION OF LIQUID, METHOD FOR WASHING A HOLLOW-FIBRE FILTER AND USE OF THE METHOD FOR WASHING A HOLLOW-FIBRE FILTER

摘要

The present group of inventions relates to devices for the purification of liquids and may, in particular, be utilised for the purification of drinking water and waste waters, including sea, river, lake and well water, by removing polar and non-polar organic substances, ions of heavy metals, microorganisms and a significant amount of salts. The group of inventions may be used both for the collection and purification of liquid from open sources and non-pressurised vessels, and also for the collection and purification of liquid, particularly drinking water, from domestic drinking water lines. An apparatus for the purification of liquid comprises means for supplying liquid to be purified, an electro-coagulation unit, a hollow-fibre filter with liquid backwash, a reverse osmosis unit, a collecting vessel, a non-return valve and means for drawing off the purified liquid. The hollow-fibre filter is backwashed first with liquid and then with a pressurised mixture of liquid and air, fed from the collecting vessel. While liquid is being pumped from the collecting vessel, atmospheric air is fed into the collecting vessel using the non-return valve. The proposed water purification apparatus makes it possible to extend the service life of the membranes used in the apparatus, and furthermore the system for the purification of liquid permits assembly in the form of a compact apparatus with a weight of a few kilograms, so that it can be carried by hand.