The ability of a manager of a public water supply and sanitation service to know his technical assets (drinking water production plants, reservoirs, network systems, connections, etc), to plan the best investments, to provide the financial resources needed for the rehabilitation and replacement of structures and respond efficiently to his heritage, is at the core of the analysis of the economic sustainability of water services. Patrimonial management (property management, asset management) is a process whereby a public water utility can direct, control and optimize the supply, maintenance and decommissioning of assets related to infrastructure, including costs for specified performance during their life cycle.
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Municipal public utility in charge of conveying drinking water to the consumer's tap and collecting and treating wastewater and stormwater before returning them to the natural environment. The 30,000 French public water supply and sanitation services are also in charge of the relations with the consumer: information, demand management, billing, etc. The "drinking water supply" service includes the abstraction of water from the natural environment, its potabilization and supply. The "sanitation" service includes the collection, conveyance and treatment of wastewater and the disposal or reuse of sludge…
Biomass of microorganisms used for treating wastewater from their pollutants (mainly organic matter). Microorganisms are free, suspended in the wastewater, kept inside an aeration tank, and feed on the pollutants. Then, the separation of activated sludge and water occurs in a clarifier: a part of the sludge is put back into the aeration tanks, while the other part (corresponding to the increase of stock) is discharged.