The first settling tank 11-the anaerobic tank 12-the intermittent aeration tank 13 is connected to the return sludge line 16 to the anaerobic tank 12 from the secondary settler tank 14 and the secondary settler tank 14,-anoxic tank (21)-secondary settler tank (14)-nitrification tank (23) using an denitrifying bacteria in an apparatus consisting of an internal transport (24) containing process from the nitrification tank (23) to the anoxic tank (COD) due to simultaneous uptake of phosphorus and denitrification in the anaerobic state due to the activity of the denitrification agent bacteria, which provides an environment for promoting the growth of denitrifying bacteria, It is possible to remove biological nitrogen and phosphorus to solve the organic matter shortage problem for denitrification and detoxification which are problems of domestic sewage.
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