Patent · US Active

Wastewater treatment method comprising decantation and fine screening stages

US7981297B2 · kind B2 · utility

6Cited by

10References

8Claims

0Family size

Assignee

OTV SA · FR

Inventors

Philippe Sauvignet · Fougères, FR
Claus Dahl · Dresden, DE

Key dates

Filing date	Nov 2, 2006
Grant date	Jul 19, 2011
Priority date	—
Expiry date	Apr 10, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F2305/12
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A method for removing helminth egg and other suspended solids from a wastewater stream includes directing the wastewater to a ballasted flocculation system and adding a coagulation agent, flocculation agent and a ballast into the wastewater. Sludge is settled from the wastewater in a settling tank at a rate of at least 10 meters per hour. The method further includes removing helminth egg by filtering the effluent through a fine screen having a mesh diameter of approximately 5 micrometers to approximately 25 micrometers. After passing through the fine screen, the filtered effluent has less than one helminth egg per liter.

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