Method for identifying the type of clogging in a membrane filtration apparatus

Method for treating a membrane filtration apparatus having at least one fluid inlet and at least one fluid outlet, said method comprising a first step a) of supplying and flowing, through said membrane filtration apparatus for a first predetermined period of time, a first enzyme solution comprising at least one protease, said first step a) being followed by a first measurement, carried out at said at least one fluid inlet and/or at said at least one fluid outlet of said membrane filtration apparatus, of at least one first value of a parameter for characterising the fluid flowing in said membrane filtration apparatus, this at least one first measured value of a parameter being compared with a measured value of this same parameter prior to step a),

• said method being characterised in that it comprises, for identifying the nature of the clogging present in said membrane filtration apparatus, a second step b) of supplying and flowing in said membrane filtration apparatus, for a second predetermined period of time, a second enzyme solution comprising at least one enzyme other than a protease, said second step b) being followed by a second measurement, carried out at said at least one fluid inlet and/or at said at least one fluid outlet of said membrane filtration apparatus, of at least one second value of a parameter for characterising the fluid flowing in said membrane filtration apparatus, this at least one second measured value of a parameter being compared with a measured value of this same parameter prior to step b), said steps a) and b) being implemented in any order.