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Wastewater treatment plants. Overall performances

Wastewater treatment plants. 2014-2018 Overall performances
2014 2015 2016 2017 2018
Operative treatment plants 489 495 510 516 518
Treatment plants analysed (1) 475 474 493 : 493
Volume treated (1,000 m3/day) 1,723.5 1,704.0 1,713.0 1,742.0 1,880.0
Volume treated hm3/year 629.1 622.0 626.9 635.8 690.0
Average elimination performance (%)
suspended materials 94.0 94.7 94.0 94.0 94.0
biochemical demand for oxygen 95.1 95.4 96.0 96.0 96.0
chemical demand for oxygen 92.7 93.4 94.0 94.3 93.0
Source: Agència Catalana de l'Aigua.
(1) Some systems were not analysed because they became operational at the end of the year, because it was not possible to obtain a sample due to them being septic tank or infiltration type facilities or because they were plants operated on a seasonal basis.
Note: Only includes public treatment plants.
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