Ultrafiltration influent water may contain colloids or suspended solids of expensive metals such as iron and aluminum, and may also have a tendency to scale such as hardness. These impurities may cause inorganic pollution of the ultrafiltration membrane. In this case, in order to ensure the long-term stable operation of the ultrafiltration system, it is recommended to add a certain concentration of acid solution for chemically enhanced backwashing during the backwashing process. The acid used can be hydrochloric acid, oxalic acid or citric acid according to the specific raw water quality.

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