The Communauté Urbaine Marseille Provence Métropole and SERAM (Société d’Exploitation du Réseau d’Assainissement de Marseille) are proposing to participants a visit of Marseille’s “Géolide” waste water treatment plant, on March 13 and 15 2012.
Capable of treating waste water of 1,860,000 inhabitants, Géolide is the biggest subterranean waste water purification plant in the world. Situated in the city centre, this underground cathedral is odourless, silent and quasi invisible.