the advanced waste water treatment plant

advance aerial air aircraft airplane apartment apartments bacterium biology biomass circle clean cleaning community construction dirty disposal ecology enclosed engineering environment environmental europe facility factory flat flight flow fly fully garbage green guangzhou house industrial industry kunming land lodging luogang panoramic plane plant poland pollution processing purification purified purity recycle recycling reduce removal river road science sciences sewage sky sludge smell smelly steel stink surroundings swage tank the transpire treatment tree unpleasant urban view waste water wroclaw