[Concentration of bacteria in water using the ultrafiltration method (author's transl)].

Four ultrafiltration units have been tested in order to concentrate bacteria in water. The experiments run with Escherichia coli allows the selection of an ultrafiltration apparatus which concentrates bacteria with high recovery efficiencies. The use of this concentrator is simple and fast. Its filtration power is very stable and its little capacity allows the continuous ultrafiltration of large volumes of water.