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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

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

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

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

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

Rotating biological contactor

Updated on 25/02/2019
Définition
Sens technique

Biological treatment process at fixed culture on carriages. These rotating biological contactors (RBC), generally polystyrene, measure 2 to 3 m in diameter and rotate about a horizontal axis by being partly immersed. Sludges, putrescible very produced by this system are removed by a secondary clarifier.

Source
according to Recyconsult

Sludge thickening

Updated on 06/09/2018
Définition
Sens technique
Increasing the dry matter content of the sludge without modifying the liquid nature of the sludge. The thickening of sludge can be done merely by gravity in a concentrator or by mechanical means (dripping, flotation or centrifugation).
Source
according to ADEME

Land application of sewage sludge

Updated on 06/09/2018
Définition
Sens technique
Action of spreading organic matter-laden wastewater over a surface, to treat it by percolation into the soil while feeding soils poor in organic matter.
Source
according to IFREMER

Sludge filtration

Updated on 06/09/2018
Définition
Sens commun
Process for the mechanical dewatering of extracted sewage sludge at the clarifier outlet. Sludge filtration can be done by filter press or filter bag.
Source
according to the General Council of Seine-et-Marne

Biological filter

Updated on 25/02/2019
Définition
Sens commun

Process used for the wastewater treatment (by biofiltration) or to eliminate gaseous pollutants dissolved in the water, or to filter surface water in order to make it potable.

Source
according to Wikipedia

Constructed wetland

Updated on 25/02/2019
Définition
Sens commun

System which allows the purification of wastewater by plants mostly reeds: the phytopurification. This method consists in making wastewater flowing through submersed plants, which roots have a high purification power.

Source
According to IOWater

Flotation of sludge

Updated on 06/09/2018
Définition
Sens commun
Sludge separation process based on differences in hydrophobicity of the surfaces of the particles to be separated. E.g. Flotation of sludge is used in mineralurgy to separate minerals from each other and in the treatment of wastewater to remove fats.
Source
according to ADEME

Lagoon-based treatment systems

Updated on 25/02/2019
Définition
Sens commun

Natural purification process, which consists in passing the water through basins, slowly enough to let submersed plants achieving their purification role, before releasing the water in the nature. Indeed, the aquatic vegetation hosts some bacterial communities able to remove pollutants such as nitrates, phosphates...

Source
According to IOWater

Trickling filter

Updated on 25/02/2019
Définition
Sens technique

Aerobic biological wastewater treatment reactor in which the bacterial purifying biomass is placed on an inert support, forming a biofilm (fixed bed). Wastewater is uniformly distributed on the surface and flow downwards with the gravity, through the pores of the filter. Thus, bacteria can degrade the carbon pollution and a part of the nitrogen one. The natural air ventilation carries to the bacteria, all the oxygen they need to eliminate the pollution.

Source
According to Seine-et-Marne Departemental Council