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Infrastructure-asset management of public water and sanitation services

Updated on 25/02/2019
Définition
Sens technique

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.

Source
According to AFB, AgroParisTech and ASTEE

Public water supply and sanitation services

Updated on 25/02/2019
Définition
Sens technique

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…

Source
According to the Ministries of the Environment and Health and AFB

Drinking water supply system

Updated on 25/02/2019
Définition
Sens commun
Part of the overall water supply system including pipes, tanks, pumping stations and other equipment through which water is supplied to users. This part begins at the exit of drinking water production plants and ends at the point of water delivery to the user. It does not include private pipes and accessories of buildings that bring water to the consumption points.
Source
According to the Ministries of the Environment and Health and AFB

Water conveyance system

Updated on 06/09/2018
Définition
Sens commun
Set of techniques to bring water from its spring to consumption sites.
Source
according to Wikipedia

Water softening

Updated on 04/12/2018
Définition
Sens commun
It is a technique to remove minerals that cause water hardness, especially calcium and magnesium.
Source
according to IOWater
Sens technique
A technique consisting in exchanging the calcium and magnesium ions, which are not very soluble and which react with the carbonates of water to form limestone, with the sodium ions which are perfectly soluble in water. This operation is named "ion exchange".
Source
According to UAE

Water aeration

Updated on 06/09/2018
Définition
Sens commun
Bringing water and air in close contact to remove all dissolved gases (especially those responsible for bad odours) from water and introducing oxygen to oxidise certain compounds such as iron and manganese to prevent corrosion).
Source
according to WHO

Water corrosivity

Updated on 06/09/2018
Définition
Sens commun
Qualifies water which can dissolve scale and limestone. Corrosive water contributes to the corrosion of metallic pipes and equipment. It can cause the dissolution of metals (nickel, iron, copper, lead, cadmium...) and in this case induce health risks.
Source
according to the Alsace Regional Health Agency (ARS)

Discharge authorisation

Updated on 06/09/2018
Définition
Sens technique
Administrative act decided by the community, owner of a sanitation facility, to authorise an exceptional water discharge. This authorisation is mandatory for any connection of an industrial effluent to a community sewerage network. It obligatorily sets the characteristics of the effluents to be complied with, the duration of the authorisation and the monitoring methods to be used.
Source
according to the Adour-Garonne Water Agency

Pollution basin

Updated on 06/09/2018
Définition
Sens technique
Storm basin intended to retain the pollution of the first waters during periods of heavy rain.
Source
according to FNDAE

Retention basin

Updated on 06/09/2018
Définition
Sens technique
A storm management basin for the temporary storage of runoff water to protect homes and structures during periods of heavy rain.
Source
according to the Intermunicipal Sanitation Syndicate of the Enghien-les-Bains region

Activated sludge

Updated on 25/02/2019
Définition
Sens technique

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.

Source
According to FNDAE

Biological sludge

Updated on 06/09/2018
Définition
Sens commun
Residual solids produced by biological wastewater treatment. Biological sludge is mainly composed of bacterial bodies and secretions.
Source
according to Wikipedia

Water treatment sludge

Updated on 06/09/2018
Définition
Sens commun
Sludge resulting from the treatment of water.
Source
according to the Seine-Normandy Water Agency

Digested sludg

Updated on 06/09/2018
Définition
Sens technique
Also called anaerobic sludge, it results from a biological stabilisation process, reducing the amount of organic matter in the waste, through anaerobic digestion (absence of oxygen) in a digester.
Source
according to Wikipedia

Primary/green sludge

Updated on 06/09/2018
Définition
Sens commun
Sludge resulting from the primary treatment by clarifier.
Source
according to the eco-enterprise development centre

Hydroxide sludge

Updated on 06/09/2018
Définition
Sens technique
Sediment resulting from the physico-chemical treatment of industrial wastewater. Hydroxide sludge, generated by surface treatment of metal parts, is considered to be hazardous.
Source
according to the South-Pyrenean Waste Observatory

Mixed sludge

Updated on 06/09/2018
Définition
Sens technique
This sludge is usually a mixture of primary sludge and biological sludge.
Source
according to Wikipedia

Primary sludge

Updated on 06/09/2018
Définition
Sens technique
It includes settleable solids removed during primary wastewater treatment in clarifiers. Primary sludge is rich in mineral matter.
Source
according to Wikipedia

Sewage farm

Updated on 06/09/2018
Définition
Sens technique
An area receiving, through a network of buried pipes, the clarified waters coming out of an all-water pit and having enabling conditions for the purification and drainage of the treated wastewater towards the deeper layers of the subsoil.
Source
according to Alpes Géo Conseil

Water tower

Updated on 04/12/2018
Définition
Sens commun
A tower with an elevated high-capacity tank used to store drinking water and then convey it by gravity pipes.
Source
according to AFB

sludge composting

Updated on 06/09/2018
Définition
Sens technique
Aerobic biological stabilisation process (without the presence of oxygen) of sewage sludge.
Source
according to ADEME

Sludge conditioning

Updated on 06/09/2018
Définition
Sens technique
Change of the characteristics of sewage sludge by physical or chemical processes to facilitate the separation of solids and liquids.
Source
according to Recyconsult

Sanitation contract

Updated on 06/09/2018
Définition
Sens technique
Multi-year contract signed by various stakeholders (a municipality, a wastewater treatment syndicate, a water agency, etc.) to specify the nature, cost and duration of the planned sanitation work to meet essential technical and financial development in the long term.
Source
according to the Mulhouse Multipurpose Syndicate

Water cycle

Updated on 06/09/2018
Définition
Sens commun
All water exchanges and transformations in the various components of the environment. The big water cycle (or natural cycle) describes the exchanges in the whole ecosystem, the small water cycle (or anthropogenic cycle), describes the circulation of water in a man-made network.
Source
according to the Water Agencies and AFB

Sludge settling

Updated on 06/09/2018
Définition
Sens technique
Separation of active sludge and treated water obtained by sedimentation in a clarifier or secondary clarifier. Good settleability of the sludge is essential for the process to be efficient and reliable.
Source
according to FNDAE