Described is a method for preparing a purified liquid containing carbohydrates. The method comprises the steps of: hydrolysing starch to a dextrose equivalent (DE) of 10 or above, thus obtaining a liquid of carbohydrates； removing a heavy weight sludge fraction from the light weight liquid of carbohydrates using centrifugation； filtering the remaining liquid of carbohydrates, the filter being capable of retaining coarser particles while allowing particles with a diameter less than 2µm to pass； performing membrane separation on the filtered liquid of carbohydrates using a membrane having a pore size at 2µm or below； and recovering a permeate stream of purified liquid containing carbohydrates. Also disclosed in a plant for performing the method.
