| 摘要 |
The present invention overcomes mutually contradictory problems associated with a system for organic wastewater treatment through denitrification and nitrification processes, to the effect that when the circulating volume from the nitrification tank to the denitrification tank is increased to achieve high removal of nitrogen, the introduction of a nitrified fluid rich in dissolved oxygen causes a reduction in denitrification performance of the denitrification tank. Thus, the object of the present invention is to provide a system and method for organic wastewater treatment through denitrification and nitrification processes, which system and method achieve high removal of nitrogen without reducing the denitrification performance of denitrification tanks. According to one embodiment of the present invention, the object stated above is achieved by providing a system for treating organic wastewater, which comprises a multistage treatment tank having at least two stages in series, each stage comprising a denitrification tank and a nitrification tank connected in this order, wherein said system comprises a pipe for distributing feed water to the denitrification tank in each stage, a means for filtering and separating at least a part of an activated sludge mixed liquor present in at least one nitrification tank, and a pipe for supplying at least a part of the concentrated sludge mixed liquor obtained by said filtration and separation treatment to the denitrification tank.
|
