A method of operating a sequencing batch reactor having a cycle consisting of FILL, REACT, SETTLE and DRAW periods and optionally an IDLE period, wherein supply of feed to the sequencing batch reactor comprises distributing the feed into settled sludge in the bottom part of the reactor. Also provided...http://www.google.es/patents/US5525231?utm_source=gb-gplus-sharePatente US5525231 - Method of operating a sequencing batch reactor
