2012م - 1444هـ
WASTE WATER

TREATMENT

chap 10

European Green Capital Award Nantes 2012 2013

149











European Green Capital Award Nantes 2012 2013

150

10 A

Present situation.

Waste water in the Nantes metropolitan area (575,000 h) is treated in

twelve purifi cation plants, with capacities that vary from 1,200 inhabitant

equivalent (Vertou – Pégers Reigners) to 600,000 inhabitant equivalent

(Vallée de Tougas - Nord Loire). Together, they have a total capacity of

780,000 inhabitant equivalent, which will increase to 840,000 population

equivalent when the updated biological treatment process at the Petite

Californie (Sud Loire) purifi cation plant comes into service (at the end of

2010).

This capacity means that expansion of the metropolitan area presents no fears and industrial waste-water

discharges containing biodegradable effl uent can be treated (102 agreements signed in 2009, 477 authorisations,

2,094 fi les opened). There is systematic and regular monitoring of industrial discharges. In addition,

waste water from villages far removed from the transfer networks is treated by nine semi-public treatment

plants.