Résumé :
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Waste stabilization ponds are an extremely appropriate and sustainable method of wastewater treatment in many situations in mediterranean countries. this manual could serve to promote modern pond design in the region. design by itself is not enough : operation and maintenance are crucial, but fortunately with ponds this is very much simpler and requires less skilled labour than is the case with electromechanical treatment processes. guidance is also given on pond monitoring and evaluation, and this can lead to improved design - there is no substitute for local data. sometimes, because of more rigorous legislation or neglect, pond systems need upgrading or rehabilitation, and this is also discussed. in several countries of the region wastewater is generally too valuable to waste, and the reuse of pond effluents for crop irrigation or for fish culture is very important in the provision of high quality food. in semi-arid zones, the use of wastewater storage and treatment reservoirs is advantageous as it permits the whole year's wastewater to be used for irrgation, thus enabling the irrigation of a much larger area and consequently much higher crop production.
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