Drinking water treatment Aquatic environments 1 Bacterial growth 1 Biogeochemical cycling 1 Biological treatment systems for water 1 Biotic characteristics 1 Chemical characteristics, pollution 1 Freshwater animals 1 Freshwater plants 1 Hydrobiology 1 Land reclamation 1 Natural waters 1 Physical charecteristics , pollution 1 Physico chemical treatment 1 Sludge treatment 1 Subsurface pollution 1 Terrestrial environments 1 Wastewater treatment 1 Water basin management 1 Water quality management 1 Water treatment 1 aeromicrobiology 1 aquatic ecosystems 1 water ecology 1