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ESTONIAN ENVIRONMENTAL REVIEW 2009

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Tallinn<br />

Kohtla-Järve<br />

Rakvere<br />

Tartu<br />

Pärnu<br />

demand in<br />

Estonia<br />

100<br />

total nitrogen<br />

85<br />

70<br />

55<br />

% 40<br />

100<br />

2001 2002 2003 2004 2005 2006 2007<br />

total phosphorus<br />

75<br />

50<br />

25<br />

%<br />

0<br />

2001 2002 2003 2004 2005 2006 2007<br />

100<br />

BOD 7<br />

95<br />

90<br />

85<br />

% 80<br />

2001 2002 2003 2004 2005 2006 2007<br />

Figure 6.10. Efficiency of wastewater treatment plants over 100,000 population equivalent according to biochemical oxygen demand<br />

(BOD 7<br />

), total phosphorus and total nitrogen in 2001–2007. Data: EEIC.<br />

94

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