MEMBRANE FILTERING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a membrane filtering method which efficiently reduces remaining aluminum concentration.SOLUTION: In a membrane filtering method, treated water and a polyaluminum chloride solution with basicity of >85% and ≤95% are mixed, and then the treated water is filtered by a filtration membrane. In the membrane filtering method, the polyaluminum chloride solution may not contain a sulfate radical. The filtration membrane may be a ceramic filtration membrane. In this case, the ceramic filtration membrane may be a monolithic ceramic membrane.