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.
The first major stage in wastewater treatment that removes solids and organic matter mostly by the process of sedimentation or flotation. Examples of primary treatment technologies include septic tanks, biogas settlers, etc. See also pre-treatment.