無機アンモニア合成廃水で馴養した固定化担体内微生物の消長と硝化性能に関する研究

概要

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Bacterial population dynamics and nitrification characteristic of immobilized activated sludge have been investigated during acclimation procedure to inorganic synthetic wastewater (NH4-N 20mg·l-1). A 1.5 liter reactor was operated at 20 °C with a hydraulic retention time of 3 hours for the start-up and 1 to 3 hours after 2 years. Number of nitrifying bacteria in pellet entrapping activated sludge increased around 103 times in the first 10 days and reached to a higher level of 108 to 109 cells·ml-1-pellet. The higher level was still maintained after 2 years. At the same time heterotrophic bacteria existed 108 to 109 cells·ml-1-pellet throughout the operation. Electron micrographs of cross sections of pellet, both in the start-up period and after 2 years, suggested the coexistence of nitrifiers and heterotrophes both of which formed respective colonies. It was confirmed that the nitrification activity increased 3 times when the number of nitrifying bacteria increased 10 times.
社団法人　日本水環境学会の論文
1997-09-10