| abstract |
(57) [Problem] To provide a new technology capable of stably obtaining a large flux of dynamic filtration, stably reducing the SS of dynamic filtered water, and reducing the amount of sludge generated. SOLUTION: In a biological treatment step, an organic wastewater is biologically treated in a state where iron or aluminum hydroxide flocs and biological sludge coexist, and the coexisting sludge is separated into solid and liquid by a dynamic filtration membrane to take out filtered water. , A part of the solid-liquid separated sludge or the sludge of the biological treatment step is withdrawn, and an acid is added to elute the metal hydroxide and the extracellular polymer of the biological sludge to form a slurry containing metal ions of iron or aluminum. A method and an apparatus for purifying an organic wastewater that is produced and returns the metal-ion-containing acid-treated slurry to the biological treatment step. |