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1. (WO2017033160) METHOD FOR TREATING WASTE WATER COMPRISING A QUICK STATIC DECANTER AND ASSOCIATED FACILITY

Pub. No.:    WO/2017/033160    International Application No.:    PCT/IB2016/055111
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Sat Aug 27 01:59:59 CEST 2016
IPC: C02F 3/12
C02F 1/00
C02F 1/52
C02F 9/00
B01D 21/00
B01D 21/02
B01D 21/24
B01D 21/30
Applicants: SUEZ INTERNATIONAL
Inventors: PUJOL, Roger
ARNAUD, Patrick
DONNAZ, Sylvain
Title: METHOD FOR TREATING WASTE WATER COMPRISING A QUICK STATIC DECANTER AND ASSOCIATED FACILITY
Abstract:
The invention relates to a method for treating waste water comprising upstream at least one step of treatment by activated sludge in an aeration basin (1), and downstream at least one step of decanting in a fast static decanter (4), in which the flows at the inlet and outlet of the decanter are adjusted according to a setpoint value for the mass load at the inlet and outlet respectively, and according to the concentration of material in suspension measured at the inlet and outlet respectively. Said adjustment also takes account of a residence time of the material in suspension limited to between 30 minutes and 100 minutes, preferably to between 40 minutes and 60 minutes. The invention also relates to a facility comprising the fast static decanter.