| 摘要 |
A method for culturing at a high concentration nitrifying bacteria contained in activated sludge (sewage sludge, raw sewage sludge, etc.) which comprises nitrifying and acclimatizing the activated sludge under the conditions of an dissolved oxygen concentration of 2 to 4 mg/l, at pH 7.5 to 8.5 and at a temperature of 25 to 35 ~C for about 1 to 2 months with the use of a treated sludge waste such as filtrate obtained by dehydrating sludge or nitrificatio n waste liquor (ammonia concentration: 100 to 300 mg/l); and continuously sustaining the pH value, which is liable to shift toward the acidic region i n the acclimatization process, within a range of from 7.5 to 8.5 by adding a culture promoter comprising a mixture of sodium carbonate and sodium hydrogencarbonate (molar ratio: 4-7:4-8) to thereby acclimatize and accumula te the nitrifying bacteria contained in the active sludge. Thus, nitrifying bacteria contained active sludge can be cultured in a large amount at a high concentration.
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