| 摘要 |
PURPOSE:To make malodorous gas odorless by supplying the washing waste solution obtained by washing the filter membrane of a membrane filter with an acid to a deodorizing tower to react the same with ammonia gas. CONSTITUTION:Waste water is subjected to nitration treatment by activated sludge in the nitration part 2A of a biological treatment tank 2 to produce oxidized nitrogen and, in the denitrification part 2B of said tank 2, an org. substance is used as the nutritive source of activated sludge to perform the denitrification treatment of said oxidized nitrogen. The activated sludge is separated from the treated water after nitration treatment and denitrification treatment by the first ultrafilter 3 and a flocculant is mixed with the filtered water from the first ultrafilter 3 to convert an iron component to insoluble iron hydroxide floc by alkali. The ammonia gas in the malodorous gas generated from the biological treatment tank 2 is reacted with an acid in the acid deodorizing part 6a of a deodorizing tower 6 to be made odorless while hydrogen sulfide in the malodorous gas is reacted with sodium hypochlorite to be made odorless. |
