Water is essential to human. It has always played an important role in the history of humanity. Source of life, it is also a source of conflict in many parts of the world. At the beginning of the XXI century, water has become a major issue and only nations that have preserved their capital water can survive. The Mediterranean countries, considered semi-arid will be increasingly confronted with water shortages, as pressures from agriculture, industry and people are strong and growing. Due to its geographical position, Tunisia is subject to the influence of both climates, the Mediterranean to the north and the other Saharan south who are the source of spatial and temporal variability of water resources. Thus the average annual rainfall varies from less than 100 mm in the extreme south to over 1500 mm in the extreme north of country.This location makes Tunisia a renewable water resources in countries relatively limited.
Since about 30 years, Tunisia has always considered that water is a heritage as defined in the Water Code (Law No. 75-16 of 31 March 1975) which, at the first chapter treats water as Public Water domain and as a natural resource available and whose use must adhere to sound management rules of the national natural heritage. Tunisia has already begun the exploitation of non-traditional water resources through the installation of treatment plants for wastewater for reuse for irrigation purposes and also committed since 1983 desalination plants brackish waters of Kerkennah and Gabes, Zarzis and Djerba. Thus, to rely on the use of non-conventional water resources on a more and more important, and for the particular socio-economic and geopolitical value of water, it is paramount for our country to develop activities research and training to master the technology of desalination and water treatment. The Tunisian Association of Desalination TDA is created within this framework to contribute to these activities and especially to build strong relationships between stakeholders in the field: researchers, operators and decision makers. This requires dissemination of information, collaboration to conduct research and training activities and the organization of regular meetings. The use of European regional cooperation and especially within the scope of our concerns to promote the exchange of information, experience and ensure complementarity. water sources. Thus the average annual rainfall varies from less than 100 mm in the extreme south over 1500 mm in the extreme north of country.This location makes Tunisia a renewable water resources in countries relatively limited.