Waste water treatment without nitrogen, phosphorus and organic contamination reduction reagents employs a settler following anoxic, anaerobic, anoxic and oxic zones for recirculation of the biological sludge from the oxic and anoxic zones

摘要

Wastewater treatment that highly reduces organic pollution and comprises nutrients phosphorus (P) and nitrogen (N) without the use of reagents comprises: (a) a first anoxic stage comprising a wastewater flow input where wastewater is circulated to obtain the liquid (b) passing in an anaerobic treatment zone, post-anoxic area, and to an oxic stage and (c) passing in a decanter or clarifier for the separation of sludge from the clarified liquid. An independent claim is included for an equipment for wastewater treatment.