Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
Short factsheet on nitrification in trickling filters (form the United States Environment Protection Agency (EPA).
U.S.EPA (2000): Trickling Filters Nitrification. (= Wastewater Technology Fact Sheet, EPA 832-F , 15 ). United States Environment Protection Agency URL [Accessed: 17.05.2012]