Application method of biological composite membrane material

The invention belongs to the technical field of water purification, and in particular relates to an application method of a biological composite membrane material. Filamentous bacteria and metabolites of the filamentous bacteria are used as substrates; modification is performed through ferric sulfate and alkaline liquor; gravity filtering and ultrasonic cleaning are performed; the materials are poured into a membrane forming container to be subjected to vacuum suction filtration; the materials are put into a polymine solution to be soaked; freeze drying is performed; the biological composite membrane material is obtained. The process of the preparation process of the biological composite membrane material is simple; the preparation operation condition is mild; the cost is low; secondary pollution does not exist; the biological composite membrane material is used for removing arsenic from a water body; through the multiple effects of adsorption, ion exchange, retention and the like of the biological composite