Patent · US Expired

Method for the removal of nutrients containing carbon, nitrogen and phosphorus

US5605629A · kind A · utility

11Cited by
3References
12Claims
0Family size

Inventor

Key dates

Filing dateApr 13, 1995
Grant dateFeb 25, 1997
Priority date—
Expiry dateApr 13, 2015

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S210/921
  • WIPO fieldEnvironmental technology
  • WIPO sectorChemistry

Abstract

The method is of the type wherein the raw or untreated water to be treated is made to circulate in cells or biofilters with submerged filtering beds working anaerobically and then aerobically or vice versa. A treatment module is used comprising at least two cells or biofilters in series (for example one biofilter under anaerobic conditions and one to five biofilters under aerobic conditions) in making phases of anaerobiosis and then aerobiosis alternate cyclically. The entry of flow to be treated takes place always in the anaerobic cell. Advantageously, each phase of the cycle is separated from another by a hold phase comprising a halt in the supply of water to be treated.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.