Sewage treatment. Waste water being mechanically stirred during the aeration phase at a waste water treatment works. The purpose of aeration is to promote the growth of microorganisms which degrade the organic matter contained in the effluent. The microorganisms form a flocculant,or sludge,a proportion of which is removed and treated separately | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 5329 px × 3544 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |