METHOD AND DEVICE FOR TREATING WASTE WATER FROM LAUNDERETTES

摘要

The invention relates to a method and a device for treating waste water from launderettes. Coarse solid particles are extracted from the waste water produced by the washing process by means of at least one classifying device (7) e.g. a fine sieve, and undissolved as well as biodegradable dissolved substances are extracted by means of a bio-membrane reactor (14) arranged downstream from said classifying device. Part of the discharge flow (21) from the bio-membrane reactor is recirculated in the form of wash water for the washing process. Preferably, at least part of the recirculated water flow (22) is desalted by means of membrane modules (23) e.g. nanofiltration or reverse osmosis modules, and the concentrate thus obtained is optionally evaporated and evacuated.