urban sewage wastewater treatment by the activated sludge method under arid climate at Touggourt (South-East Algeria).

Abstract

The treatment of urban wastewater in an activated sludge treatment plant under the climatic conditions of the city Touggourt leads to an effluent of physicochemical quality and satisfactory organic materials. A reduction of all parameters characterizing the organic load: COD and BOD 5 with average annual percentages of 89.7% and 90.1% respectively are achieved. This reduction is made in parallel with a reduction of more than 94.3% for the MES, with a residence time of 18 hour...