A method and a plant for reducing sludge produced in a water purification process

摘要

A method for reducing sludge produced in a water purification process, produced in the water purification process, comprising the following activities: conveying the sludge to a tank of activated sludge; conveying the sludge to a sedimentation tank; producing an ozone-enriched gas starting from air; subjecting at least a part of the sludge produced in the purification process to action of the ozone-enriched gas by means of a microbubble diffuser in a reaction tank with a liquid surface level which is lower than 1 metre and a contact time which is less than 5 minutes and by action of two further different ozone injection points; returning the sludge exiting the reaction tank to the activated sludge tank.