PURPOSE: To process manure and waste water under optimum conditions by controlling the processing quantity of a nitrification reactor in such a manner that optimum nitrification and denitrification reactions may be effected in accordance with prescribed data, separating sludge from the effluent thereof and sending the sludge to an effluent line denitrification reactor provided with an effluent discharge path and nitrogen discharge path.

CONSTITUTION: The processing quantity of the nitrification reactor 9 is controlled in a manner that the optimum nitrification and denitrification reactions may be achieved in accordance with ≥1 data of the prescribed data, such as the information from a WAZU respiration meter and the oxygen concn., etc., in the nitrification reactor 9 in the method for processing the manure and the waste water contg. Kjeldahl-N. Part of the effluent from the nitrification reactor 9 is sent to the recirculation denitrification reactor 13 and a carbon source is added to the effluent heading toward the recirculation denitrification reactor 13. The remaining part of the effluent from the nitrification reactor 9 is supplied to a separator 19 where the sludge is separated. The effluent from the separator 19 is added with the carbon source at need and is sent to the effluent line denitrification reactor 37. The effluent line denitrification reactor 37 is provided with the effluent discharge path 38 and the nitrogen discharge path 17.