http://www.vocabularyserver.com/gemet/en/http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=3842waste water pollution http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=3842 waste water load RT http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=3842 pollution type BT