Runoff water from small treatment plants

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In Europe, the quality of water discharged from small treatment plants is governed in 91/271/EEC directive.

Class	CSB mg/l	BSB5 mg/l	NH4-N mg/l	N_anorg. mg/l	P mg/l	Faecal coliforme Keime je 1000 ml	AFS mg/l
C	150^/100^**	40^/25^*	-	-	-	-	75^*
N	90^/75^**	20^/15^*	10^**	-	-	-	50^*
D	90^/75^**	20^/15^*	10^**	25^**	-	-	50^*

^* obtained from certified sample, ordinary sample of faecal coliform bacteria

^** ermittelt aus der 24-h Mischprobe; NH₄-N und N_anorg. Bei Abwassertemperaturen T ≥ 12°C

Die meisten modernen Kläranlagen verfügen über bessere BSB₅ Ablaufwerte von < 25 mg/l.

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