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Tag: Sewage

Trends in Phosphorus loads and concentrations, Baltic Sea, 1900-2030
The graphic shows trends in Phosphorus loads and concentrations in the Baltic Sea from 1900 to 1995 with projections to 2030. Phosphorus is an agricultural fertilizer. Phosphorus is produced in nature, but never in its p...
13 Feb 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Population density in the Baltic Sea drainage basin
The density of people per square kilometers have been calculated from various statistical sources, and displays the situation at approximately 1990. Population, and specifically cities, act as driving forces in regards t...
04 Oct 2005 - by Hugo Ahlenius, UNEP/GRID-Arendal
Major cities in the Andean community
The urbanisation of the population has been happening since the first city, and is rapidly increasing in rate - especially since the dawn of industrialization. The Andean community consists out of five countries: Venezue...
20 Sep 2005 - by Hugo Ahlenius, UNEP/GRID-Arendal
Regional trends in biological oxygen demand
The graphic is a global comparison of the biological oxygen demand measured in milligrams per litre. It covers the years from 1976 - 2000. The biological oxygen demand refers to the amount of oxygen required by aerobic m...
28 Sep 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Ratio of wastewater treatment
Sewage treatment is low or absent in many parts of the World, leading to eutrophication of the coastal zone, (toxic) algae blooms and dramatically reduce the ability of coral to recover from bleaching events dramatically...
01 Nov 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Urban water cycle
This graphic illustrates the impact of human activity on groundwater. It shows that groundwater is obtained from periurban wellfields and urban wells, then used and disposed of as wastewater through pluvial drainage, pip...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
Latvia, topographic map
Latvia is located in Eastern Europe, bordering the Baltic Sea, between Estonia and Lithuania, comprising of 64,589 sq km. It has a population of 2,290,237 (2005). Major environmental concerns are: Latvia's environment ha...
27 Sep 2005 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Discharge of selected pollutants
Nitrogen and phosphorous represents nutrients that can be seen as pollutants, as large concentations of those increase eutrophication. Nutrients are present in primarily commercial fertilisers and in sewage. A measure of...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Caribbean casualties due to hurricanes
From Trinidad to Tallahassee, Florida, tropical storms have ravaged the Caribbean basin, exacting a multibillion-dollar toll on housing, schools, hospitals, roads and sewage systems. Most of the casualties were in Haiti....
01 Feb 2006 - by Emmanuelle Bournay, UNEP/GRID-Arendal
Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990
Nutrient loading is projected to become an increasingly severe problem, particularly in developing countries. Nutrient loading already has major adverse effects on freshwater ecosystems and coastal regions in both indust...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Sanitation sewage and treatment in big cities - Two study cases
Case study to compare two urban centres.
01 Mar 2010 - by UNEP/GRID-Arendal
Centralized or decentralized? - Uganda. A study case
Looking at the costs and benefits, centralized systems may not be the answer in terms of best result for the investment. The chart on the left shows that the financial NPV does not change with increasing population size ...
01 Mar 2010 - by UNEP/GRID-Arendal
Industrial areas and seasonal zones of oxygen depleted waters
This graphic illustrates the strong link between areas with high densities of industrial activity and zones of seasonally oxygen-depleted waters. There is a strong link between areas with high densities of industrial ac...
26 Jan 2009 - by Phillipe Rekacewicz, (Le Monde diplomatique) February 2008
Access to sanitation in Yaoundè
Proper disposal of sewage is essential for urban water quality, and in Yaoundè the treatment of wastewater, excreta, and sewage can be classified into two categories – individual wastewater systems (septic tanks and latr...
18 Mar 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal