Water that has been used by man. We usually distinguish wastewater from domestic, industrial or agricultural origin. These waters are discharged into the natural environment directly or through collecting systems with or without treatment. We also talk of sewage or effluent.
Directive 91/271/EEC of 21 May 1991 concerning urban waste water treatment. It concerns the collection, treatment and discharge of urban waste water and the treatment and discharge of waste water from certain industrial sectors. Its purpose is to protect the environment against the adverse effects of the above-mentioned wastewater discharges. For this purpose, it defines the obligations of local authorities regarding the collecting and treatment of urban waste water and the terms and procedures for agglomerations with more than 2,000 population equivalents. The municipalities involved must, in particular,:…
A sanitation process including a public system for wastewater collecting and conveyance to a treatment plant.
All treatment processes that remove wastewater from an individual single-family home usually on the plot on which the house is built, without any wastewater conveyance. An extension (rarer) concerns the wastewater treatment of some neighbouring houses on private land. It is still on-site sanitation but it is regrouped. On the contrary, a group having a small collecting system and a treatment facility (spreading, filters, etc.) on community land is considered community sanitation. On-site sanitation is first defined as opposed to community sanitation.
Ratio between removed pollution and produced pollution. The pollution removal yield represents the effectiveness of the sewerage system of an agglomeration. It is equal to the multiplication of the treatment plant yield by the
Action to change and improve the concerned facilities to comply with the regulations affecting them.