Importance

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Abstract

Provided is a process for producing water including generating a water to be filtrated wherein a water to be treated is treated to generate a water to be filtrated; filtration wherein the water to be filtrated is filtrated through a separation membrane module having a separation membrane to generate a filtrated water; back washing wherein the substance to be removed by filtration which has blocked the separation membrane in the step of filtration is washed away by using a cleaning water; and drainage wherein cleaning drainage generated in the step of back washing is drained; wherein the step of generating the water to be filtrated has a coagulation substep of adding a first pH adjuster and a cationic coagulant to coagulate the substance to be removed by filtration in the water to be treated to thereby generate the pretreated water; the water to be filtrated used in the step of filtration satisfies the following expression (i); and the step of back washing has at least first back washing substep wherein the separation membrane is back-washed by the cleaning water satisfying the following expressions (ii) and (iii):

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First Claim