| 摘要 |
Provided is a biological treatment method of organic-matter-containing water in which a decrease in the permeation flux of a membrane in a membrane-separation activated-sludge process can be effectively suppressed. A biological treatment method of organic-matter-containing water includes introducing organic-matter-containing water containing organic matter into a biological treatment tank, mixing the organic-matter-containing water with activated sludge, biologically treating the organic-matter-containing water, and subjecting a mixed liquor of the organic-matter-containing water and the activated sludge to membrane separation, wherein an iron salt and a phenolic resin are added to the raw water. Substances (for example, metabolites of activated-sludge organisms) that cause a decrease in the permeation flux of a separation membrane become insoluble due to the flocculating effect by the iron salt and bonding with the phenolic resin. |
