Membrane filtration process in water treatment can be an efficient and economical way to
separate contaminants, which suspended in water. Membrane fouling is a phenomenon to decrease
water flux and increase operating pressure. It is important to normalize a membrane process by
cleaning a fouling membrane as well as to predict membrane fouling. However, method of
determining the cleaning characteristics of fouling membrane is insufficient. By introducing a new
concept of membrane cleaning index (MCI), membrane cleaning mechanism was established by MCI
through in this study. Cleaning efficiency of fouling membrane was compared and analyzed
quantitatively. Cleaning index value of organic, inorganic and microbes can be indicated by membrane
cleaning index. Chemical cleaning efficiency increased applying the result of membrane cleaning index
to chemical cleaning. Membrane cleaning index is a useful method to indicate index of membrane
cleaning properties and efficiency.