Superactivation Reactor Purifies Water.

Lyonnaise Des Eaux-Dumez S.A. (Nanterre, France) has developed a method of purifying wastewater biologically that allows use of older sludge but maintains high reaction rates.

The biological reaction is performed in a reactor containing microorganisms in activated sludge, and the wastewater is separated from the activated sludge in a clarification basin with a fraction of the activated sludge from the reactor being recirculated. Before admitting the wastewater to be treated into the reactor, at least a fraction of the polluting particles in suspension are separated out and sent to a sludge activation reactor separate and disposed in parallel. The separating polluting particles are used as the main substrate for …